Subjects -> PHYSICS (Total: 857 journals)
    - ELECTRICITY AND MAGNETISM (10 journals)
    - MECHANICS (22 journals)
    - NUCLEAR PHYSICS (53 journals)
    - OPTICS (92 journals)
    - PHYSICS (625 journals)
    - SOUND (25 journals)
    - THERMODYNAMICS (30 journals)

PHYSICS (625 journals)            First | 1 2 3 4 | Last

Showing 201 - 400 of 741 Journals sorted alphabetically
International Journal of Astronomy and Astrophysics     Open Access   (Followers: 37)
International Journal of Biological, Physical and Chemical Studies     Open Access  
International Journal of Computational Materials Science and Surface Engineering     Hybrid Journal   (Followers: 7)
International Journal of Damage Mechanics     Hybrid Journal   (Followers: 5)
International Journal of Engineering and Applied Physics     Open Access  
International Journal of Fatigue     Hybrid Journal   (Followers: 41)
International Journal of Fracture     Hybrid Journal   (Followers: 14)
International Journal of Geometric Methods in Modern Physics     Hybrid Journal   (Followers: 2)
International Journal of Geophysics     Open Access   (Followers: 5)
International Journal of Heat and Fluid Flow     Hybrid Journal   (Followers: 43)
International Journal of Low Radiation     Hybrid Journal  
International Journal of Low-Carbon Technologies     Open Access   (Followers: 1)
International Journal of Mass Spectrometry     Hybrid Journal   (Followers: 16)
International Journal of Material Forming     Hybrid Journal   (Followers: 1)
International Journal of Materials and Product Technology     Hybrid Journal   (Followers: 2)
International Journal of Mechanical Sciences     Hybrid Journal   (Followers: 15)
International Journal of Mechanics and Materials in Design     Hybrid Journal   (Followers: 7)
International Journal of Medical Physics, Clinical Engineering and Radiation Oncology     Open Access   (Followers: 11)
International Journal of Microstructure and Materials Properties     Hybrid Journal   (Followers: 7)
International Journal of Microwave Science and Technology     Open Access   (Followers: 12)
International Journal of Modeling, Simulation, and Scientific Computing     Hybrid Journal   (Followers: 3)
International Journal of Modern Physics A     Hybrid Journal   (Followers: 15)
International Journal of Modern Physics B     Hybrid Journal   (Followers: 12)
International Journal of Modern Physics C     Hybrid Journal   (Followers: 14)
International Journal of Modern Physics D     Hybrid Journal   (Followers: 13)
International Journal of Modern Physics E     Hybrid Journal   (Followers: 13)
International Journal of Multiphysics     Open Access  
International Journal of Nanomanufacturing     Hybrid Journal  
International Journal of Nanoscience     Hybrid Journal  
International Journal of Nanotechnology     Hybrid Journal   (Followers: 9)
International Journal of Non-Linear Mechanics     Hybrid Journal   (Followers: 8)
International Journal of Nonlinear Dynamics and Control     Hybrid Journal   (Followers: 6)
International Journal of Physics     Open Access   (Followers: 10)
International Journal of PIXE     Hybrid Journal  
International Journal of Plasticity     Hybrid Journal   (Followers: 7)
International Journal of Quantum Information     Hybrid Journal   (Followers: 6)
International Journal of Self-Propagating High-Temperature Synthesis     Hybrid Journal  
International Journal of Solids and Structures     Hybrid Journal   (Followers: 14)
International Journal of Surface Science and Engineering     Hybrid Journal   (Followers: 6)
International Journal of Theoretical and Applied Multiscale Mechanics     Hybrid Journal   (Followers: 3)
International Journal of Theoretical and Mathematical Physics     Open Access   (Followers: 13)
International Journal of Theoretical Physics     Hybrid Journal   (Followers: 17)
International Journal of Thermal Sciences     Hybrid Journal   (Followers: 19)
International Journal on Smart Sensing and Intelligent Systems     Open Access  
International Letters of Chemistry, Physics and Astronomy     Open Access   (Followers: 9)
International Materials Reviews     Hybrid Journal   (Followers: 15)
Iranian Journal of Medical Physics     Open Access  
Iranian Journal of Science and Technology, Transactions A : Science     Hybrid Journal  
Ironmaking & Steelmaking     Hybrid Journal   (Followers: 4)
Izvestiya, Atmospheric and Oceanic Physics     Full-text available via subscription   (Followers: 1)
Izvestiya, Physics of the Solid Earth     Hybrid Journal   (Followers: 2)
Jambura Physics Journal     Open Access  
JETP Letters     Hybrid Journal   (Followers: 3)
Journal of Adhesion Science and Technology     Hybrid Journal   (Followers: 10)
Journal of Advanced Physics     Full-text available via subscription   (Followers: 13)
Journal of Advances in Physics     Open Access   (Followers: 13)
Journal of Applied Mathematics and Physics     Open Access   (Followers: 9)
Journal of Applied Mechanics and Technical Physics     Hybrid Journal   (Followers: 7)
Journal of Applied Physics     Hybrid Journal   (Followers: 69)
Journal of Applied Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Astrophysics     Open Access   (Followers: 34)
Journal of Astrophysics and Astronomy     Open Access   (Followers: 59)
Journal of Building Physics     Hybrid Journal   (Followers: 1)
Journal of Chromatographic Science     Hybrid Journal   (Followers: 15)
Journal of Complex Networks     Hybrid Journal   (Followers: 1)
Journal of Composite Materials     Hybrid Journal   (Followers: 250)
Journal of Computational and Theoretical Transport     Hybrid Journal   (Followers: 2)
Journal of Computational Methods in Physics     Open Access   (Followers: 8)
Journal of Computational Physics     Hybrid Journal   (Followers: 60)
Journal of Computational Physics : X     Open Access   (Followers: 1)
Journal of Contemporary Physics (Armenian Academy of Sciences)     Hybrid Journal   (Followers: 9)
Journal of Dynamic Systems, Measurement, and Control     Full-text available via subscription   (Followers: 14)
Journal of Elasticity     Hybrid Journal   (Followers: 7)
Journal of Electron Spectroscopy and Related Phenomena     Hybrid Journal   (Followers: 3)
Journal of Electronic Materials     Hybrid Journal   (Followers: 3)
Journal of Electronics Cooling and Thermal Control     Open Access   (Followers: 9)
Journal of Engineering Materials and Technology     Full-text available via subscription   (Followers: 17)
Journal of Engineering Physics and Thermophysics     Hybrid Journal   (Followers: 2)
Journal of Experimental and Theoretical Physics     Hybrid Journal   (Followers: 4)
Journal of Experimental Physics     Open Access   (Followers: 3)
Journal of Fire Sciences     Hybrid Journal   (Followers: 6)
Journal of Geometry and Physics     Full-text available via subscription   (Followers: 2)
Journal of Geophysical Research : Space Physics     Full-text available via subscription   (Followers: 144)
Journal of Gravity     Open Access   (Followers: 4)
Journal of High Energy Astrophysics     Full-text available via subscription   (Followers: 26)
Journal of High Energy Physics     Hybrid Journal   (Followers: 17)
Journal of High Energy Physics, Gravitation and Cosmology     Open Access   (Followers: 2)
Journal of Hydrogels     Full-text available via subscription  
Journal of Hyperspectral Remote Sensing     Open Access   (Followers: 23)
Journal of Imaging     Open Access   (Followers: 3)
Journal of Information Display     Open Access   (Followers: 1)
Journal of Intelligent Material Systems and Structures     Hybrid Journal   (Followers: 8)
Journal of Lightwave Technology     Hybrid Journal   (Followers: 14)
Journal of Low Frequency Noise, Vibration and Active Control     Open Access   (Followers: 8)
Journal of Luminescence     Hybrid Journal   (Followers: 2)
Journal of Materials Engineering and Performance     Hybrid Journal   (Followers: 22)
Journal of Materials Physics and Chemistry     Open Access   (Followers: 7)
Journal of Materials Science     Hybrid Journal   (Followers: 26)
Journal of Materials Science : Materials in Electronics     Hybrid Journal   (Followers: 2)
Journal of Materials Science : Materials in Medicine     Hybrid Journal   (Followers: 1)
Journal of Mathematical Fluid Mechanics     Hybrid Journal   (Followers: 10)
Journal of Mathematical Physics     Hybrid Journal   (Followers: 25)
Journal of Medical Imaging and Health Informatics     Full-text available via subscription  
Journal of Medical Ultrasonics     Hybrid Journal   (Followers: 2)
Journal of Micro/Nanolithography MEMS and MOEMS     Hybrid Journal   (Followers: 24)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Motor Behavior     Hybrid Journal   (Followers: 8)
Journal of Multiscale Modeling     Hybrid Journal   (Followers: 1)
Journal of Nepal Physical Society     Open Access  
Journal of Nondestructive Evaluation     Hybrid Journal   (Followers: 11)
Journal of Nonlinear Dynamics     Open Access   (Followers: 6)
Journal of Nonlinear Mathematical Physics     Hybrid Journal   (Followers: 2)
Journal of Nuclear Physics, Material Sciences, Radiation and Applications     Open Access   (Followers: 6)
Journal of Optics     Hybrid Journal   (Followers: 17)
Journal of Photonics for Energy     Hybrid Journal   (Followers: 2)
Journal of Physical and Chemical Reference Data     Hybrid Journal   (Followers: 4)
Journal of Physical Chemistry B     Hybrid Journal   (Followers: 48)
Journal of Physical Chemistry C     Hybrid Journal   (Followers: 36)
Journal of Physical Oceanography     Hybrid Journal   (Followers: 19, SJR: 2.461, CiteScore: 3)
Journal of Physical Organic Chemistry     Hybrid Journal   (Followers: 8)
Journal of Physics and Chemistry of Solids     Hybrid Journal   (Followers: 3)
Journal of Plasma Physics     Hybrid Journal   (Followers: 21)
Journal of Polymer Science Part B: Polymer Physics     Hybrid Journal   (Followers: 22)
Journal of Porous Materials     Hybrid Journal   (Followers: 4)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 1)
Journal of Quantitative Spectroscopy and Radiative Transfer     Hybrid Journal   (Followers: 3)
Journal of Reinforced Plastics and Composites     Hybrid Journal   (Followers: 30)
Journal of Rheology     Full-text available via subscription   (Followers: 7)
Journal of Sandwich Structures and Materials     Hybrid Journal   (Followers: 4)
Journal of Scientific Research     Open Access  
Journal of Sensors     Open Access   (Followers: 25)
Journal of Sol-Gel Science and Technology     Hybrid Journal  
Journal of Solid State Physics     Open Access   (Followers: 8)
Journal of Spectroscopy     Open Access   (Followers: 6)
Journal of Superconductivity and Novel Magnetism     Partially Free   (Followers: 1)
Journal of Synchrotron Radiation     Open Access   (Followers: 3)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 31)
Journal of the ICRU     Hybrid Journal  
Journal of the Korean Physical Society     Partially Free  
Journal of the Physical Society of Japan     Hybrid Journal   (Followers: 2)
Journal of Theoretical and Applied Physics     Open Access   (Followers: 9)
Journal of Tissue Engineering     Open Access   (Followers: 6)
Journal of Ultrasound in Medicine     Full-text available via subscription   (Followers: 11)
Journal of Vibration and Control     Hybrid Journal   (Followers: 43)
Journal of Visualization     Hybrid Journal   (Followers: 3)
Journal of Zhejiang University : Sceince A     Hybrid Journal  
JPSE (Journal of Physical Science and Engineering)     Open Access  
Jurnal Fisika     Open Access  
Jurnal Ilmiah Pendidikan Fisika Al-Biruni     Open Access  
Jurnal NEUTRINO     Open Access  
Jurnal Online of Physics     Open Access  
Jurnal Pendidikan Fisika Indonesia (Indonesian Journal of Physics Education)     Open Access  
Jurnal Penelitian Fisika dan Aplikasinya     Open Access  
Jurnal Penelitian Sains (JPS)     Open Access  
Karbala International Journal of Modern Science     Open Access  
Kasuari : Physics Education Journal     Open Access  
La Rivista del Nuovo Cimento     Hybrid Journal  
Lasers in Surgery and Medicine     Hybrid Journal   (Followers: 1)
Latvian Journal of Physics and Technical Sciences     Open Access  
Letters in High Energy Physics     Open Access  
Letters in Mathematical Physics     Hybrid Journal   (Followers: 4)
Light : Science & Applications     Open Access   (Followers: 3)
Living Reviews in Computational Astrophysics     Open Access   (Followers: 3)
Living Reviews in Relativity     Open Access  
Living Reviews in Solar Physics     Open Access   (Followers: 1)
Lubrication Science     Hybrid Journal   (Followers: 2)
Macalester Journal of Physics and Astronomy     Open Access   (Followers: 6)
Machining Science and Technology: An International Journal     Hybrid Journal   (Followers: 2)
Magnetic Resonance     Open Access  
Magnetic Resonance Letters     Open Access  
Magnetic Resonance Materials in Physics, Biology and Medicine     Hybrid Journal   (Followers: 3)
MAPAN     Hybrid Journal  
Mass Spectrometry Reviews     Hybrid Journal   (Followers: 30)
Matéria (Rio de Janeiro)     Open Access  
Materials and Design     Open Access   (Followers: 47)
Materials at High Temperatures     Full-text available via subscription   (Followers: 3)
Materials Chemistry and Physics     Full-text available via subscription   (Followers: 15)
Materials Research Bulletin     Hybrid Journal   (Followers: 25)
Materials Research Innovations     Hybrid Journal   (Followers: 1)
Materials Science     Hybrid Journal   (Followers: 8)
Materials Science and Engineering: A     Hybrid Journal   (Followers: 44)
Materials Science and Engineering: B     Hybrid Journal   (Followers: 22)
Materials Science and Engineering: R: Reports     Hybrid Journal   (Followers: 15)
Materials Science and Technology     Hybrid Journal   (Followers: 40)
Materials Today Physics     Hybrid Journal   (Followers: 1)
Matériaux & Techniques     Full-text available via subscription   (Followers: 2)
Mathematical Physics, Analysis and Geometry     Hybrid Journal   (Followers: 3)
Mathematics and Mechanics of Solids     Hybrid Journal   (Followers: 3)
Matter and Radiation at Extremes     Open Access   (Followers: 1)
Meccanica     Hybrid Journal   (Followers: 1)
Mechanics of Advanced Materials and Structures     Hybrid Journal   (Followers: 6)
Mechanics of Materials     Hybrid Journal   (Followers: 25)
Mechanics of Time-Dependent Materials     Hybrid Journal   (Followers: 2)
Mechanics Research Communications     Hybrid Journal   (Followers: 4)
Medical Physics     Hybrid Journal   (Followers: 17)
Micro and Nano Systems Letters     Open Access   (Followers: 6)
Microfluidics and Nanofluidics     Hybrid Journal   (Followers: 11)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 9)
Modern Instrumentation     Open Access   (Followers: 57)
Modern Physics Letters A     Hybrid Journal   (Followers: 14)

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Similar Journals
Journal Cover
Journal of Composite Materials
Journal Prestige (SJR): 0.555
Citation Impact (citeScore): 2
Number of Followers: 250  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 0021-9983 - ISSN (Online) 1530-793X
Published by Sage Publications Homepage  [1174 journals]
  • Effect of the spark plasma sintering temperature on the microstructure and
           mechanical properties of a ceramic/metallic glass reinforced hybrid
           composite

    • Free pre-print version: Loading...

      Authors: MR Rezaei, A Albooyeh, R Chachei, P Malahi
      Pages: 2779 - 2788
      Abstract: Journal of Composite Materials, Volume 56, Issue 17, Page 2779-2788, July 2022.
      In this investigation, hybrid aluminum matrix composites reinforced with Fe-based metallic glass (FMG) and SiC particles were synthesized using spark plasma sintering (SPS) at different sintering temperatures. The effects of sintering temperature on densification, phases, microstructure, and mechanical properties of the composites were evaluated. The findings indicate that the density of the sintered samples improved with increasing the sintering temperature. The X-ray diffraction results showed no remarkable difference in the phases of the samples sintered at different temperatures; only some small structural changes occurred in the metallic glass reinforcements. The sintering temperature had a significant effect on mechanical properties. For example, the hybrid aluminum matrix composite reinforced with 3 vol% FMG and 7 vol% SiC sintered at 550°C exhibited the ultimate compressive strength of 494 MPa, which is about 47% higher than the same composite sintered at 450°C.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-16T05:17:02Z
      DOI: 10.1177/00219983221078188
      Issue No: Vol. 56, No. 17 (2022)
       
  • Influence of crack location and crack number on the responses of 3D
           representative unit cell of unidirectional composites under tension in the
           fiber direction

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      Authors: H Sam Huang
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this paper, numerical study on crack location and crack number on the responses of representative unit cell of unidirectional composites under tension is conducted by extended finite element method (XFEM). The composites studied here are single-crack composites, two-crack composites, and three-crack composites. Each of the composites is under tension in the fiber (x) direction. From the simulation results, the averaged strength decreases as the embedded crack number increases when composites are under tension. One interesting finding is that a crack could be a dominant crack but becomes inactive when other different cracks are in presence under the same loads. The responses of representative unit cell of composites depend upon crack location and the applied loading direction. The results from these simulations can also explain why there is discrepancy of strength prediction from the composites manufactured under the same conditions. The simulation method presented here in this paper can be used to model degree of defects (by modelling the number of cracks) and stochastic characteristics of ultimate strength (by modelling distribution of crack strength).
      Citation: Journal of Composite Materials
      PubDate: 2022-06-22T07:18:02Z
      DOI: 10.1177/00219983221109947
       
  • FE-based damage modeling approach for short fiber reinforced
           thermoplastics under quasi-static load coupling anisotropic
           viscoplasticity and matrix degradation

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      Authors: Hao Xu, Marta Kuczynska, Natalja Schafet, Fabian Welschinger, Jörg Hohe
      Abstract: Journal of Composite Materials, Ahead of Print.
      It is challenging to predict the material degradation and crack initiation of short fiber reinforced thermoplastics (SFRT) components with high computation efficiency and low parameter identification effort. To achieve that, this work utilizes a hybrid method combining micro- and macro-mechanical approaches to describe the damage-coupled material behavior of SFRT. The Mori-Tanaka mean-field homogenization method is used to determine the effective linear elastic properties of SFRT, whereas the consideration of plasticity is based on a macro-mechanical anisotropic viscoplastic model. The effect of micro-damage in the matrix material on the macroscopic behaviors of SFRT is considered within the Continuum Damage Mechanics (CDM) framework. A nonlinear damage evolution law is implemented to account for the nonlinearity in the damage evolution. Targeting industrial applications, the proposed damage-coupled material model is implemented into the commercial FE software ANSYS with a novel stepwise damage updating process, requiring no user-defined subroutine. The model is calibrated with experimental data on flat specimens under monotonic and cyclic tensile loading. The FE simulation with the calibrated material model accurately describes the anisotropic deformation and crack initiation of the investigated SFRT material observed in experiments.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-20T05:19:21Z
      DOI: 10.1177/00219983221109327
       
  • Improvement of mechanical and wear resistance property by varying glass
           fiber contents and amino-silicate coupling agents on polyamide 612
           composites

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      Authors: Yu-Hsiang Yeh, Chin-Wen Chen, Palraj Ranganathan, Syang-Peng Rwei
      Abstract: Journal of Composite Materials, Ahead of Print.
      Among the polyamide series polymer materials, PA612 has excellent mechanical properties and low moisture absorption characteristics. This work studied the effect of coupling agent addition on the crystallization behavior, adhesive wear, mechanical, thermal, and morphological attributes of glass fiber (GF) reinforced PA612 composites. Amino-silane was applied as a coupling agent to enhance the interfacial adhesion between glass fiber and the PA612 matrix. The loading level of the coupling agent was changed to 0.5, 1.0, and 2.0wt%, while the GF loading level in the composite material was 10, 15, 20, and 30wt%. The composite materials were analyzed via X-ray diffraction, tribological characterization, and adhesion wear test. The mechanical, rheological, and thermal properties were also investigated. In addition, scanning electron microscopy (SEM) analysis was used to study the analytical samples’ wear and fracture surfaces. Test results unveiled that adding 1.0wt% amino-silane coupling agent upgraded the fiber-matrix adhesion, mechanical properties (tensile strength:136 MPa), and corresponding wear resistance of GF reinforced PA612-based composites. Furthermore, it is compatible with pure PA612 substrates and has similar processing rheological behavior. These results reveal that the compiled PA612 matrix is highly viable for tribological applications comprising automotive parts, bearings, and bearing materials for space applications.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-18T07:43:26Z
      DOI: 10.1177/00219983221109331
       
  • Post-buckling failure analysis of composite stiffened panels considering
           the mode III fracture

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      Authors: Binwen Wang, Xiangming Chen, Wenzhi Wang, Junchao Yang, Ru Zhang
      Abstract: Journal of Composite Materials, Ahead of Print.
      Fully utilizing the post-buckling capacity of stiffened composite panels is important to reduce the weight of aeronautical composite structures. However, owing to the complex post-buckling failure modes and mechanisms, there are no effective analysis methods. This paper explores the impacts of the mode III fracture energy on the damage behavior of the stiffener–skin interface of composite stiffened panels under post-buckling conditions. To characterize the bonding interface damage, an interface damage initiation criterion considering the effects of through-thickness compression on the shear failure was used and combined with the Reeder damage extension criterion, which considers the mode III fracture. The mode III fracture toughness characteristics of the damage evolution of the stiffener–skin interface were obtained using the edge crack torsion (ECT) test method. Moreover, the compressive deformation response, buckling load, buckling modes, failure load, and failure modes of the panel were obtained by a compression test of I-shaped stiffened panels. Based on the aforementioned experimental data and numerical model, the post-buckling behavior of the I-shaped stiffened composite panels with an open cross-section stiffener was studied. It was found that the mode III fracture energy caused by the longitudinal shear stress τ31 played a major role in the stiffener–skin interface damage extension of the stiffened panels. Therefore, the mode III fracture behavior should not be ignored in the post-buckling analysis. The numerical analysis method developed can accurately predict the damage initiation and evolution processes of the composite panel interface. The method can be effectively used for post-buckling analysis of aeronautical composite panels.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-18T03:25:56Z
      DOI: 10.1177/00219983221109946
       
  • Recycling technologies for fibre-reinforced plastic composite materials: A
           bibliometric analysis using a systematic approach

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      Authors: Beatrice Colombo, Paolo Gaiardelli, Stefano Dotti, Flavio Caretto
      Abstract: Journal of Composite Materials, Ahead of Print.
      Fibre-reinforced plastic composite materials are increasingly employed in several industries. This extensive use has resulted in a huge increase of generated waste that has to be managed without causing significant environmental issues. Recycling fibre-reinforced plastic composite materials in accordance with circular economy principles might be a way to overcome such problems. Thus, this paper aims to empirically analyse the existing scientific literature regarding recycling technologies for fibre-reinforced plastic composite materials. The main goal is to provide a holistic and comprehensive analysis of the topic, as well as research gaps and future directions following a rigorous and transparent approach. Overall, 201 articles were selected through a systematic approach and then analysed using a bibliometric analysis. Results show that this topic has been increasingly gaining momentum in recent years and that researchers have mostly carried out experimental studies on chemical and thermal recycling technologies for recovering carbon fibres. Lastly, this article provides an in-depth research agenda based on identified research gaps and an enhanced managerial grasp of this field of research.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-17T12:32:30Z
      DOI: 10.1177/00219983221109877
       
  • Improvement of optical, dielectric and mechanical properties of a new
           nanocomposite based on polyvinyl alcohol and layered double hydroxide

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      Authors: Abdelmonim Assekouri, Fatima Zahra Bouragba, Redouane Lahkale, Halima Mortadi, Elmouloudi Sabbar
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this work, films in the form of poly (vinyl alcohol)/Layered Double Hydroxide (PVA/LDH) nanocomposites were synthesized with different amount of LDH (0%; 4% and 6%), and characterized by X-ray diffraction (XRD), infrared spectroscopy scanning electron microscopy (SEM), impedance spectroscopy and UV-Vis-NIR spectroscopy. Different characterizations were used to investigate the electrical/dielectric, optical and mechanical properties of the nanocomposite films XRD and infrared spectroscopy results showed that clay particles exist in the polymer matrix. Electrical modeling was established using an equivalent electrical circuit consisting of two blocks, and confirmed by fitting the experimental conductivity data according to Jonscher’s double power law. Moreover, the reinforcement of the composite matrix by the addition of LDH particles, showed a shift of the relaxations towards the low frequencies, and led to an increase of dielectric constant, conductivity, and absorption of the light in the ultraviolet domain with a decrease of the gap energy. As for the mechanical properties, namely the Young’s modulus, is tripled when the clay content is about 6%.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-17T11:30:59Z
      DOI: 10.1177/00219983221109330
       
  • Investigation of physical, mechanical, and thermal properties of glass
           fiber reinforced polymer composites strengthened with KH550 and KH570
           silane-coated silicon dioxide nanoparticles

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      Authors: Çağrı Uzay
      Abstract: Journal of Composite Materials, Ahead of Print.
      Silicon dioxide (SiO2) nanoparticles can be used as reinforcing material for composites due to their favorable characteristics. However, they are commonly subjected to surface treatments with silane coupling agents to achieve fine dispersibility and better mechanical interlocking at interface. In this study, the silane-coated SiO2 nanoparticles (as received) were used as secondary reinforcement without applying additional silane treatment process. KH550 and KH570 silane-coated SiO2 nanoparticles were dispersed, respectively, into polymer matrix, and then the modified matrix was reinforced with glass fibers. Silanized SiO2 filled glass fiber reinforced polymer (GFRP) nanocomposites were investigated for physical, mechanical, morphological, and thermal properties. Depending on the nanoparticles' ratio and silane coating, the increments were obtained till 10% for tensile strength, between 18.40% and 75.26% for flexural strength, and till 81% for impact strength. SEM confirmed that the enhancements could be attributed to the improved interfacial adhesion between the modified matrix and fiber reinforcements. The void contents within the polymer nanocomposites decreased by 38%–54% compared to a pure one. DSC and TGA examinations revealed that silanized SiO2 nanoparticles provided a better curing behavior (10% increase in Tg for 3 wt.% KH550-SiO2) and improved thermal stability for the GFRP composites (increase in Tend values by 50–70°C). Generally, KH550 silane-coated SiO2 has provided enhanced interface strengthening, leading to better characteristics for GFRP composites since the amino functional groups contained in KH550 have more favorable integration with epoxy matrix.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-16T07:22:37Z
      DOI: 10.1177/00219983221108531
       
  • A neural-network-assisted method for flow-front estimation in resin
           transfer molding using pressure sensors

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      Authors: Junhong Zhu, David Droste, Adli Dimassi, Axel S Herrmann
      Abstract: Journal of Composite Materials, Ahead of Print.
      The resin transfer molding (RTM) process shows considerable advantages in composite manufacturing. Nevertheless, the part quality manufactured by RTM is sensitive to material and process variations during the preform impregnation. To improve the process robustness and achieve better process control, a methodology for resin flow monitoring based on a combination of a sensing system and a neural network model is proposed, which can be easily implemented into a generic RTM process. Using pressure data provided by a limited number of sensors distributed over the mold surface, the proposed method allows the prediction of flow-front patterns at any impregnation time. The dataset for training is generated by physical-based simulations. Considering the permeability changes caused by uncertainty conditions, the permeability tensor is modeled with random variations. The network parameters are obtained by trial-and-error. Furthermore, the sensor distribution scheme and the dataset size are identified as the sensitive factors of the model. Finally, the predicted results are verified by numerical solutions. This method can be used to avoid the formation of voids and improve the final part quality.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-16T06:47:11Z
      DOI: 10.1177/00219983221108445
       
  • High strength, tough/damping and creep resistant EVA/HNT nanocomposites
           via help of EVA-g-MA compatibilizer

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      Authors: Emre Tekay, Sinan Şen
      Abstract: Journal of Composite Materials, Ahead of Print.
      Organophilic halloysite nanotube (Org-HNT) reinforced poly (ethylene-co-vinyl acetate) (EVA) nanocomposites were obtained with melt compounding technique with use of 10 wt% EVA-g-MA and Org-HNT. The use of EVA-g-MA in the nanocomposites provided a better distribution of the nanotubes as evidenced by the Scanning Electron Microscope (SEM) images. This is due to MA moiety of the EVA-g-MA interacting with the Org-HNT, which decreased its intertubular interactions, resulting in better nanotube in the EVA, that is consistent with the presence of large aggregates in the EVA/5H binary composite without EVA-g-MA. The highest tensile modulus was achieved with EVA/EMA-7H nanocomposite, which is about 40 % higher as compared to neat EVA, but its toughness and tensile strength values were found to be relatively lower compared to EVA/EMA-5H with 5 phr Org-HNT. It was explained with formation of highly reinforced/stiffened EVA and EVA-g-MA phases at higher nanotube loading. Among the composites, the EVA/EMA-5H nanocomposite appears to have the best composition, with the highest tensile strength and toughness as well as a tensile modulus that is about 30% higher than that of EVA. The nanocomposites had higher storage modulus values at 25°C and temperatures ranging from −50°C to 0°C when compared to neat EVA. The EVA/EMA-5H exhibited about 110 % higher storage modulus and higher damping parameter than neat EVA at 25°C. The same nanocomposite showed highest creep recovery rate with the lowest permanent deformation in accordance with its high dynamic modulus, indicating that the EVA/EMA-5H nanocomposite with a more optimal composition and elastic character, provides better hardness-toughness/damping balance.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-13T07:28:20Z
      DOI: 10.1177/00219983221107829
       
  • Boosted viscoelastic and dynamic mechanical behavior of binary nanocarbon
           based polyurethane hybrid nanocomposite foams

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      Authors: Amir Navidfar, Osman Bulut, Tugba Baytak, Hikmet Iskender, Levent Trabzon
      Abstract: Journal of Composite Materials, Ahead of Print.
      An effective approach for improving dispersion states of multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) was employed via hybrid inclusion of the nanofillers in polyurethane matrix to further enhance viscoelastic properties. Nanocomposites based on MWCNTs, two groups of graphene and hybrid MWCNT/graphene with varied weight fractions and ratios were fabricated via a facile and scalable approach. Dynamic mechanical analysis results indicated an improvement of up to 86% in storage modulus at 25°C for hybrid MWCNT/GNP-S750 at only 0.25 wt% loading, whereas solely MWCNTs and graphene nanocomposites showed 9% and 15% enhancement at the same content, respectively. The glass transition temperature value was enhanced by about 9.5°C with 0.25 wt% inclusion of well-dispersed three-dimensional MWCNT/GNP-S750 structure, which disclosed a noticeable synergistic effect in thermomechanical properties. The reinforcement coefficient, adhesion factor, reinforcement efficiency factor, degree of entanglement and cross-link density of nanocomposites were also examined to evaluate the interaction of single and hybrid carbon nanofillers with PU matrix.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-11T01:47:04Z
      DOI: 10.1177/00219983221107964
       
  • Effect of 0.5% CNT reinforcement of a glass fiber composite on strength
           and cyclic damage induced by transverse and out-of-plane compressive loads
           

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      Authors: Alexis Salas, Ángelo Oñate, Benjamín Escudero, Carlos Medina, Víctor Tuninetti, Manuel Meléndrez
      Abstract: Journal of Composite Materials, Ahead of Print.
      The impact of the addition of 0.5 wt% multiwall carbon nanotubes (MWCNT) on the quasi-static transverse compressive resistance and damage evolution of unidirectional glass fiber reinforced composite (FRC) fabricated by resin transfer molding is investigated. The degradation of macroscopic mechanical properties such as elastic modulus and compressive strength vs. plastic strains are correlated with crack density and microcrack propagation behavior including analysis of failure phenomena such as interface debonding, matrix cracking and interface cracking. The experimental campaign includes compression tests with monotonic and cyclic loads on cubic specimens in the out-of-plane (0°) and transverse (90°) directions for masterbatch MWCNT-based and CNT-free glass FRC. In the monotonic case, the elastic modulus and maximum compressive strength increased for the glass FRC with 0.5 wt% CNTs, particularly in the transverse (0°) direction by 11% and 13%, respectively. Under cyclic loading, the elastic modulus degradation stagnates at a lower plastic deformation for composite with 0.5 wt% CNTs. In addition, CNTs reduces by 20% the cumulative plastic deformation in the 0° direction and almost 30% in the 90° direction. At the microscopic scale, image analysis showed that the CNTs improved the properties of the interface by delaying decohesion failure and reducing by around 30% and 40% the computed crack density in the 0° and 90° loading direction, respectively. In addition, image analysis in the out-of-plane direction (0°) shows that fiber-matrix decohesion is predominant before crack propagation at the interlaminar level and prior to final failure. By contrast, at 90° loadings, no decohesion is observed and crack propagation is almost purely interlaminar. Finally, the addition of 0.5% MWCNTs to the glass FRC increases the mechanical resistance of the composite material in the transverse direction demonstrated by the delaying of cracks during the failure analysis of different cycles as well as the decrease of the elastic modulus degradation and increase of compressive strength.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-08T08:52:32Z
      DOI: 10.1177/00219983221106522
       
  • Experimental and numerical investigation on the effect of core-shell
           microcapsule sizes on mechanical properties of microcapsule-based polymers
           

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      Authors: Amir Teimouri, Reza Barbaz Isfahani, Saeed Saber-Samandari, Manouchehr Salehi
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this study, the effect of various microcapsule sizes on the mechanical properties of microcapsule-based polymeric materials was investigated using the finite element method and validated with experimental outcomes. Specimens containing 5wt. % of microcapsules were fabricated to calculate the elastic modulus, and maximum tensile stress, and to validate numerical results. To consider the error, five tests were performed for all samples, and results were reported on average. The average errors between the numerical outcomes and experimental results were 4.74% and 5.35% for maximum tensile stress and elastic modulus, respectively. The coaxial electrospraying method was used for synthesizing microcapsules made of alginate (shell) and epoxy (core). A scanning electron microscope (SEM) was used to calculate the diameter of the capsules. To develop an empirical model for the average microcapsule diameter (AMD) and carry out the optimization process, response surface methodology (RSM) with central composite design was used. Also, analysis of variance was employed to validate the accuracy of the model. The effects of three parameters, including voltage, needle size, and the distance between the tip of the needle to the collector, on average microcapsule diameter, were investigated. The empirical model was validated by a confirmation run, and the determined error (1.93%) between the predicted and experimental results indicates the precision of the model. The numerical study indicated that microcapsule-based self-healing polymers containing smaller microcapsules tolerate higher stresses. However, the effect of the microcapsules’ size on the elastic modulus of a representative volume element was negligible.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-07T08:19:16Z
      DOI: 10.1177/00219983221107831
       
  • Hybridization effect of functionalized microcrystalline cellulose and
           liquid acrylonitrile butadiene rubber on epoxy

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      Authors: Roberta Motta Neves, Eduardo Fischer Kerche, Ademir José Zattera, Sandro Campos Amico
      Abstract: Journal of Composite Materials, Ahead of Print.
      Toughening epoxy resins by adding different agents has been employed as a way to reduce brittleness in composites. Some hybridization strategies combining liquid rubbers and rigid fillers can be found in the literature, but the pair cellulose-based reinforcement, such as microcrystalline cellulose (MCC), and liquid acrylonitrile butadiene rubber (NBR) is hardly studied. The aim of this work is to investigate the effect of hybridizing MCC and amino-functionalized MCC (MCCSi) with NBR on the thermal, mechanical, and dynamic-mechanical behavior of epoxy. X-ray microtomography showed a good dispersion of MCCSi fillers in epoxy/NBR compared to the non-treated MCC filler. NBR with MCCSi was found to slightly increase the thermal stability of epoxy. The addition of MCC, regardless of the functionalization, decreased tensile strength and elastic modulus, but improved impact strength and toughness properties (KIC). Also, MCCSi composites displayed better dynamic-mechanical behavior, attributed to the enhanced chemical interaction, with a small effect on glass transition temperature.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-04T05:40:05Z
      DOI: 10.1177/00219983221107096
       
  • Experimental investigation of three-point bending behavior of assembled
           hybrid composite tubes before and after the fire endurance test

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      Authors: Ated Ben Khalifa, Nessrine Brahem, Sonia Braiek, Redouane Zitoune, Mondher Zidi
      Abstract: Journal of Composite Materials, Ahead of Print.
      This work presents an experimental investigation of the post-fire flexural strength of Filament-wound Glass Fiber Reinforced Polymer (GFRP) tubes manufactured by CTRA Company. These tubes are assembled according to both the NFT57-900 and DIN-16966 standards’ recommendations. To this end, flexural tests have been carried out on butt-to-butt assembled tubes, before and after fire endurance tests. To gain a better insight into fire-induced damage mechanisms, thermal analysis (DSC and TGA), FTIR analysis tests, as well as Scanning Electron Microscope (SEM) observations have been conducted. The experimental results revealed that a water leakage was observed prior to the recommended threshold time by the International Maritime Organization (IMO) resolution. It has been also confirmed that flexural properties of the GFRP tube are degraded after the fire tests. Furthermore, a quantitative comparison for both filament tubes assembled according to the NFT and DIN standards confirms that the NFT ones depict higher resistance. Finally, damage investigation reveals that the main observed forms of damage occurring during this experiments are delamination and matrix cracking phenomena. The main novelties of this work are (a) extending the classic analysis carried out on simple composite plate to cover water-filled GFRP assembled tubes subject to fire endurance test, and (b) the experimental investigation of DIN and NFT butt welded joined pipes under three point loading prior and post fire endurance test.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-04T04:33:31Z
      DOI: 10.1177/00219983221107094
       
  • Isogeometric analysis based on non-uniform rational B-splines technology
           of stress and failure strength in inter-ply hybrid laminated composite

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      Authors: Faouzi Rahmouni, Mohamed Elajrami, Kouider Madani, RDSG Campilho
      Abstract: Journal of Composite Materials, Ahead of Print.
      In the present study, the stress distribution and first ply failure strength of hybrid laminated composites subjected to uniaxial tensile and compression loads are predicted using Isogeometric analysis (IGA) based on non-uniform rational B-splines technology, commonly referred to as non-uniform rational B-splines (NURBS) technology. The obtained results were compared to finite element method results (ANSYS) published in the literature and analytical results using Autodesk Helius Composite software. Graphite-glass/epoxy hybrid composite plates are analyzed for different lamination orientations and used to calculate first ply failure strength. Non-interactive theories such as maximum stress, maximum strain, and fully interactive criteria such as Tsai-Wu, Tsai-Hill and Hoffman are used to predict the failure strength of different laminates. The failure envelopes of the hybrid composites are developed using the same failure criteria used for the graphite-glass/epoxy hybrid composite. The effects of IGA refinement and plate’s dimension on the present analysis were also established. The IGA results showed good accuracy, robustness and good convergence speed with the analytical software results and the finite element method (FEM) reference value.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-01T07:01:51Z
      DOI: 10.1177/00219983221105313
       
  • Investigation of mechanical properties of hybrid stainless steel/acrylic
           and carbon fiber reinforced epoxy composite

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      Authors: Ayten Nur Yuksel Yilmaz, Doruk Erdem Yunus, Ayse Celik Bedeloglu
      Abstract: Journal of Composite Materials, Ahead of Print.
      Hybrid composite specimens were produced with stainless steel-acrylic (SSA) and carbon fiber reinforcement in order to achieve ductile behavior compared to CF reinforced epoxy composites. Laminated composites containing CF and SSA fabrics in with different ply configurations were manufactured using vacuum infusion method. In addition, CF fabric was used in two different ply orientations (0–45°). In both the flexural and tensile test results, composites having CF oriented at 0° showed higher strength and modulus but lower strain than composites having CF oriented at 45°. When the number of carbon fiber layers increased, the composites showed high strength and modulus, but low strain. Increasing the number of SSA significantly increased the flexural and tensile strains of laminated composites. After the mechanical tests, the fracture surfaces of the specimens were examined with an optical microscope and matrix cracks, fiber breakage, fiber pull-out and delamination failures were observed.
      Citation: Journal of Composite Materials
      PubDate: 2022-06-01T01:47:02Z
      DOI: 10.1177/00219983221106249
       
  • Propagation of tunnelling cracks in composite materials under strain and
           force-controlled cyclic loading

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      Authors: A Moncy, BF Sørensen, O Castro, C Berggreen, J Glud
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this paper, the propagation of tunnelling cracks in composite laminates subjected to uniaxial force-controlled and strain-controlled cyclic loading is analysed considering both interacting and non-interacting cracking scenarios. Glass fibre reinforced polymer laminates with [math] layup are used in the analysis. For non-interacting cracks, a strain-controlled test under a single strain value is found to be sufficient to produce the slope of the Paris-Erdogan law type curve relating the crack front growth rate (CGR) with the energy release rate (ERR), but within a limited range of ERR. Whereas, a force-controlled test is found more suitable when characterising the variation of the CGR at a certain ERR value. For closely spaced cracks, commonly seen crack interaction scenarios are identified and the CGR of the crack front is investigated for both loading control modes. It is found that the CGR decreases when volume averaged stresses are reduced ahead of the crack front due to shielding effect at high crack densities. A relationship between these two parameters is presented. It is further found that the CGR of two collinear crack fronts growing towards each other for coalescence do not influence each other. But when the two crack fronts are not collinear the CGR of the crack fronts is significantly affected after they have grown past each other.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-29T12:43:41Z
      DOI: 10.1177/00219983221084408
       
  • Analysis and design of laminated composite beams based on a refined
           higher-order theory

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      Authors: George C Tsiatas, Aristotelis E Charalampakis
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this work, a new analysis and design methodology of laminated composite beams is presented. The problem is formulated for both symmetric and antisymmetric ply-stacking configurations, based on a refined higher-order shear deformation theory. The solution is obtained using the Analog Equation Method (AEM) while the design process is based on the Differential Evolution (DE) metaheuristic optimization algorithm, using both displacement and strength-related objective functions. Numerical examples are presented, demonstrating the applicability and effectiveness of the proposed analysis and design methodology. The results indicate that to minimize the deflection of an orthotropic laminated beam the principal material orientation must coincide with the longitudinal axis of the beam. Moreover, for the strength optimization problem, the Tsai-Wu failure criterion proved to be numerically unstable, returning very large negative values for seemingly indifferent configurations. Conversely, Hashin’s criterion manifests robustness during the optimization process ensuring efficacious design.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-27T10:33:32Z
      DOI: 10.1177/00219983221097175
       
  • Fiber content measurement of hybrid carbon and glass fiber reinforced
           thermoset composites

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      Authors: Cody Johnson, Selvum Pillay, Haibin Ning
      Abstract: Journal of Composite Materials, Ahead of Print.
      Hybrid carbon fiber and glass fiber reinforced thermoset composites are commonly used in structural applications throughout the energy, aerospace, automotive, and marine industries. The differing fiber types can be combined into a hybrid composite with the intent to efficiently utilize the beneficial properties of each type of reinforcement. The fiber fraction of each individual fiber type influences the mechanical properties of the overall composite. Measurement of the fiber fraction of each individual fiber type allows understanding and prediction of the mechanical properties as well as a method of quality control in manufacturing. A combination of a carbonization in nitrogen method for the measurement of fiber content in carbon fiber reinforced composites and an oxidation method to measure the glass fiber content are used for the first time. It has been demonstrated that the approach is effective at measuring the carbon fiber and glass fiber contents in hybrid glass and carbon fiber thermoset composites in both epoxy and vinyl ester resin systems.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-25T09:27:26Z
      DOI: 10.1177/00219983221105021
       
  • Preforming of non-crimp fabrics with distributed magnetic clamping and
           Bayesian optimisation

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      Authors: Rajan Jagpal, Evangelos Evangelou, Richard Butler, Evripides G Loukaides
      Abstract: Journal of Composite Materials, Ahead of Print.
      A novel preforming process was developed for non-crimp fabric (NCF) materials that generated in-plane tension through discontinuous blank boundary conditions. The method employed magnetic clamps and was designed to be both flexible and scalable, with clear routes to industrialisation. The capability of the process was explored in physical trials for a hemispherical and a cubic geometry. Characterisation of a biaxial veiled NCF showed the veil had a dominant effect on the bending mechanics. Subsequently a macroscale finite element model was developed to include an efficient bending idealisation and non-orthogonal in-plane material behaviour. Finally, global process optimisation of the preforming process was demonstrated. The optimisation approach used Gaussian process modelling with a periodic kernel to estimate the wrinkle size for untested clamping arrangements and then deployed Bayesian optimisation to find the optimal configuration. Results indicated that distributed magnetic clamping was effective and amenable to surrogate modelling.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-25T02:50:18Z
      DOI: 10.1177/00219983221103637
       
  • Investigation of electrical and electromagnetic properties of quartz fiber
           reinforced polymer composite material by using modified paints with carbon
           nanoparticles (graphene/double-walled carbon nanotube)

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      Authors: Nihal Gul, Belgin Genc Oztoprak
      Abstract: Journal of Composite Materials, Ahead of Print.
      Composite materials have many features to contribute to aircraft design but have low electrical conductivity. In this study, it is aimed to increase the electrical conductivity of FRP (Fiber Reinforced Polymer) composites used in different parts of the aircraft. The modified nanoparticles were added into the aircraft paint and applied on the composites used in the radome part of the aircraft, and it is aimed to either increase or keep the electromagnetic permeability stable. Firstly, the surfaces of the FRP composite samples were painted by Graphene and Double-Walled Carbon Nanotube (DWCNT) to reinforce the conductive nanoparticles at different ratios. Resistance measurements of the samples were made according to the Airbus “Electrical Surface Resistance Measurement” procedure and their electrical conductivity was calculated. The Non-Contact Measurement Method test setup was used to obtain information about the electromagnetic properties of the samples. As a result of the measurements, N3 (σ = 4.37x10−4 S/m, S21 = −15.81 dB) sample conforms the best with the objectives of ourstudy compared to electrical conductivity (N0, σ = 4.83x10−5 S/m) and electromagnetic permeability (N0, S21 = −15.83 dB) of the reference sample. The contact angle measurements were taken to determine the contact angle changes depending on the surface morphology and conductivity changes of the samples painted with different and varying amounts of nanoparticle doped paint. Additionally, measurements were taken with the FTIR-ATR instrument to make surface analysis of the samples.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-24T08:10:04Z
      DOI: 10.1177/00219983221099332
       
  • A novel post-processing method for progressive failure analysis of brittle
           composite compression

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      Authors: Rebecca A Cutting, Anthony J Favaloro, Johnathan E Goodsell
      Abstract: Journal of Composite Materials, Ahead of Print.
      Finite element analysis of brittle materials in axial compression typically uses element deletion to allow continued global deformation post-element-failure. However, element deletion produces cyclic load-displacement curves that underestimate energy absorption and are not representative of a continuum system. Two key observations support the conclusion that results from an appropriately discretized model can be an adequate representation of a continuum system. Specifically, the frequency of the oscillations in the load-displacement curve is directly dependent upon element length in the loading direction, and the peak amplitudes of oscillations are mesh size independent. A method of post-processing the analysis results, by connecting the peak amplitudes of oscillations, is proposed and applied to a series of continuous carbon fiber composite crush tubes. The load-displacement curve, stable crushing load, and specific energy absorption of the post-processed results compare well to an experimental study of crush tubes with similar layups.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-24T07:26:40Z
      DOI: 10.1177/00219983221101985
       
  • Comparison of off-axis angle on the low velocity impact behaviors for
           carbon-fiber-reinforced polymer laminates

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      Authors: Ning Pei, Qi Wu, Lianchun Long
      First page: 2483
      Abstract: Journal of Composite Materials, Ahead of Print.
      Three types of composite specimens with different off-axis angles after indentation were subjected to progressive tensile loading, and the results showed that although the tensile strength is reduced with an increase in off-axis fiber orientation angle, such off-axial structure can enhance the impact-resistance capacity. An acoustic emission (AE) signals analysis showed that data can be divided into categories that correlate with three damage modes. The AE peak frequency characteristics of each damage mode were also identified for both specimens with and without indentation, and the results also showed that indentation can change the order of appearance of different damage modes during loading. Additional characterization was provided by using Micro-computed tomography (Micro-CT) during a progressive tensile loading process, and the CT images provided visualization of damage location and evolution in the composites, with the data exhibiting good correlations with the AE data for defect prediction. The use of AE and Micro-CT technology was shown to effectively characterize composite damage evolution, and such data can potentially serve as a reference for the structural health monitoring (SHM) of such composites when used in structures.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-06T09:48:17Z
      DOI: 10.1177/00219983221099109
       
  • Thermal conductivity of crack-containing media: A numerical study

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      Authors: Yu-Lin Shen, Mohammad G Abdo, Isabella J Van Rooyen
      First page: 2495
      Abstract: Journal of Composite Materials, Ahead of Print.
      The present study aims to evaluate the effective thermal conduction behavior of crack-containing media through micromechanical modeling. Numerical analyses were performed using the finite element method, first using periodic arrays of elliptical pores and then reducing the elliptical minor axis to reach the crack limit. This parametric approach was seen to be able to capture the effect of discontinuity across the crack face in a straightforward manner. The overall thermal conductivity of the model structures, encompassing a range of crack densities and spatial distributions, was investigated. It was found that, for cracks with mixed orientations, the effective thermal conductivity is insensitive to the actual crack alignment and can be uniquely represented by the crack density. The mixed-orientation periodic crack configurations are also representative of random sizes, orientations, and spatial distributions of cracks, thus exhibiting a high degree of generality. The modeling analyses can also be used to determine simple empirical expressions for two- and three-dimensional media containing random cracks.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-05T01:39:46Z
      DOI: 10.1177/00219983221095502
       
  • Investigation of the compaction behaviour of a quasi-unidirectional
           non-crimp fabric during the vacuum infusion process

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      Authors: David Droste, Likith Krishnappa, Sarah Bornemann, Jan-Hendrik Ohlendorf, Minerva G Vargas Gleason, Axel S Herrmann, Walter Lang
      First page: 2509
      Abstract: Journal of Composite Materials, Ahead of Print.
      The compaction behaviour of technical textiles such as non-crimp fabrics (NCF) is of much interest to build high quality parts in liquid composite moulding processes (LCM). In this paper, the compaction response of a glass fibre NCF was investigated in two different ways: (1) characterisation tests via a universal testing machine and (2) height measurements via a line laser measurement unit during the infusion process. Results from both measurement systems are compared and it is found that the results of characterisation tests via testing machine can be used only to a certain extent. The pressure-thickness correlation during the infusion process cannot be described by the results of the testing machine, while the compaction results before and after the infusion process are in good agreement for both the methods. With the data of the line laser measurement, a model for the pressure-thickness correlation is derived, which can be used in future simulations. The infusion process was carried out using different scenarios at the vent, on the one hand a semi-permeable membrane and on the other hand an omega profile at the venting port. The results obtained using these two different venting scenarios were compared and it was found that using a semi-permeable membrane as an outlet can lead to thicker parts (up to 10%).
      Citation: Journal of Composite Materials
      PubDate: 2022-05-06T04:25:56Z
      DOI: 10.1177/00219983221092011
       
  • Improving the damage tolerance of Si3N4 by forming laminate composites
           with refractory metals

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      Authors: David J Mitchell, John J Mecholsky
      First page: 2525
      Abstract: Journal of Composite Materials, Ahead of Print.
      The objective of this research was to demonstrate that the damage tolerance of Si3N4 could be significantly improved by forming laminate composites with refractory metals, providing materials that undergo graceful failure, rather than the fast-fracture mechanism exhibited by monolithic Si3N4. A damage tolerant Si3N4 could be used as a ring material in an all-ceramic bearing, decreasing the chance for catastrophic failure if the ring is stressed in tension during operation. The technical approach formed a laminate composite material using alternating Si3N4-metallic layers, with both outer layers being Si3N4 to take advantage of its greater wear resistance, chemical stability, and thermal stability. The metallic layers are designed to arrest any cracks in the outer layers, thus producing a toughened Si3N4 and avoiding the catastrophic failure behavior exhibited by monolithic ceramics. The laminate composites were fabricated using a combination of tape-casting Si3N4 and metals from slurries, as well as metal foils, followed by hot pressing at 1500°C. The metallic materials employed were chromium, titanium, and tantalum. Analysis confirmed that the interfaces were well formed, and the laminates with chromium and titanium formed intermetallic compounds more readily than the composites with tantalum. The Si3N4-Ta laminates demonstrated crack deflection and bridging behavior during failure and flexural strength of 800–900 MPa. The hardness and elastic modulus of Si3N4-Ta laminates measured by nanoindentation were similar to those reported in literature. The hardness across the interface of the Si3N4-Ta composite varied according to the composition of the interface, which displayed a profile indicative of a diffusion bond.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-05T01:11:39Z
      DOI: 10.1177/00219983221099340
       
  • Mechanical behavior of interfacial stress transfer in platelet-reinforced
           thermoset polymeric composites

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      Authors: Ahmad Almagableh, Mohammad A Omari
      First page: 2551
      Abstract: Journal of Composite Materials, Ahead of Print.
      This study models the mechanical performance of thermoset polyamide filled with various percentages of glass beads using a coupling agent. A micromechanical model is developed for polyamide glass-bead composite containing three-phase zones with imperfect bonding across interfaces. The micromechanical/interface model uses square sub-region arrays representing particle, matrix, and interface zones to obtain the stress transfer behavior across the cohesive zone for a given microstructure. Understanding the stress transfer tool and interfacial adhesion across multi-coated inclusions, and developing accurate material models will help in establishing upcoming design criteria in the engineering of polymer based composites. The impact of this study comes from the fact that the diffusion quality and non-uniform distribution of inclusions within the polymer matrix, and weak bonding of filler to the polymer matrix, may result in an ineffective stress transfer, which in turn degrades the mechanical properties of nanocomposites. The influence of incomplete interfacial adhesion on the modulus and strength property of polymer-based composites has been investigated in this study. The coupling agent used had a minor impact on the stiffness of the composite which confirms the fact that stiffness is minimally affected by interfacial bonding. The model also revealed that the maximum obtainable stress decreases with increasing volume fraction of glass present in those composites with no coupling agent.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-05T09:57:27Z
      DOI: 10.1177/00219983221099849
       
  • High velocity impact response of corrugated core composite sandwich
           structures

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      Authors: Dolati Shokoofeh, Shariati Mahmood
      First page: 2559
      Abstract: Journal of Composite Materials, Ahead of Print.
      The mechanisms of projectile penetration of composite sandwich panel with empty, trapezoidal corrugated cores have been experimentally investigated. The panels have been designed to investigate the influences of specific parameters, like the fiber type of corrugated core, the projectile nose shape and the stacking sequence of face-sheets, on the impact performance from the aspects of sequential deformation, failure modes and associated mechanisms. Experimental results demonstrated that usage of Twill glass fiber in corrugated core is attained highest performance in term of energy absorption and residual velocity for the fully perforated specimens. Comparisons of panels with different stacking sequences for face-sheets verify that the corrugated core composite sandwich structures with [math] stacking sequence is indicated the highest energy absorption. This panel is displayed a superior resistance over the ones with other stacking sequences. The hemispherical projectile is showed no deviation from the direct line of path flight relative to the conical and blunt projectile in the high velocity impact test. Moreover, the deviation of the projectile decreases the damage area in specimens.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-04T07:24:03Z
      DOI: 10.1177/00219983221093706
       
  • Experimental investigation of buckling behavior of E-glass/epoxy laminated
           composite materials with multi-walled carbon nanotube under uniaxial
           compression load

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      Authors: Halil Burak Mutu, Züleyha Aslan
      First page: 2573
      Abstract: Journal of Composite Materials, Ahead of Print.
      This study experimentally investigated the effects of nanoparticle reinforcement on the buckling behavior of composite materials. Different sizes of carboxylic acid functionalized multi-walled carbon nanotubes were used as nanoparticles. E-glass fiber-reinforced composite materials with polymer matrix in the [0°/90°/0°/90°]s cross-ply array with and without carbon nanotube reinforcement were produced by hand lay-up and vacuum bagging. Three types of carbon nanotubes in different sizes and proportions of 0.1%, 0.2%, 0.3%, 0.4%, and 0.5% by weight were added to the epoxy resin. For the buckling test, the samples with two clamped and two free sides were attached to the universal testing machine to apply a uniaxial compressive load. As a result of the experiments, it was found that the addition of carbon nanotube in certain proportions increases the critical buckling load of composite materials. The highest increase in the critical buckling load (26.10% increase) was achieved with a carbon nanotube reinforcement of 0.2% by weight, having an outer diameter of 10–20 nm, internal diameter of 5–10 nm, and length of 0.5–2 mm. As the carbon nanotube sizes added to the epoxy resin decreased, the buckling strength increased.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-06T01:22:11Z
      DOI: 10.1177/00219983221098795
       
  • Delamination onset in composite materials due to fatigue loading

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      Authors: Luisa Boni, Daniele Fanteria, Luigi Lazzeri, Ugo Mariani, Marco Rigamonti
      First page: 2585
      Abstract: Journal of Composite Materials, Ahead of Print.
      An experimental program has been carried out for the evaluation of the delamination onset condition of various composite material systems, under the application of constant amplitude cyclic loading. Standard Double Cantilever Beam End Notch Flexure and Mixed Mode Bending specimens were used; the assessment of resistance to fatigue delamination onset has been performed by means of procedures defined in similitude with the standard static test procedures, introducing appropriate variants, where necessary. Three materials systems have been investigated: two carbon epoxy unidirectional materials and a carbon epoxy 5-harness satin. Normalised curves show a common trend and allow the identification of onset values for the evaluation of defects tolerance in the “no growth” approach. A similitude with the interlaminar fracture toughness measured in static tests, as a function of mode-mix ratio, has been highlighted with a higher influence of the mode I component. A modification of the Benzeggagh–Kenane relationship is proposed, that captures more faithfully the trend of the onset results.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-09T07:31:52Z
      DOI: 10.1177/00219983221100588
       
  • Effect of stacking sequence of glass and jute fiber reinforced polymer
           composites on their low velocity impact properties

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      Authors: Amuthakkannan Pandian, Mohamed Thariq Hameed Sultan, Vairavan Manikandan, Uthayakumar Marimuthu, Arun Prasath Kanagaraj, Tabrej Khan
      First page: 2599
      Abstract: Journal of Composite Materials, Ahead of Print.
      This paper investigated the effect of stacking sequence on the low velocity impact behavior of glass and jute fiber reinforced hybrid composites. The hand layup method is used to fabricate the composites with various stacking sequences. The low velocity impact analysis was carried out at various impact energies, namely 5 J, 10 J and 15 J. Dye penetrant inspection (liquid penetrate inspection) was performed to analyses the damage area in the composites. Compression after impact (CAI) testing was conducted to study the compression strength of the composites after the impact. The study revealed that the jute fiber composites exhibited better results in terms of energy absorption, but the damage area of the composites was higher, compared to the other specimens fabricated. Meanwhile, hybrid composite S7 presented high energy absorption and the minimum damage area. To conclude, the hybrid composite S7 appeared to have the optimum formulation, showing better results in energy absorption, with lower damage and higher compression strength.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-09T05:42:18Z
      DOI: 10.1177/00219983221101220
       
  • Effect of weaving parameters on fiber structure of 3D woven preforms: A
           Micro-CT investigation

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      Authors: Zhi Yang, Yanan Jiao, Junbo Xie, Wei Jiao, Li Chen, Liping Zhu, Xuefei Du
      First page: 2609
      Abstract: Journal of Composite Materials, Ahead of Print.
      The fiber structure of three-dimensional (3D) woven preform is generally complex due to the contact interactions and micro-scale deformations of the yarns during the weaving process. The present study explores the effect of weaving parameters on the fiber architecture of 3D woven preforms. Two groups of samples were prepared and observed using micro‐computed tomography (Micro-CT) technology. Semantic segmentation of Micro-CT images was conducted using deep learning algorithm to create explicit models of different yarn systems. Two novel indicators were proposed for quantifying the changes of weft yarn position and warp/binder yarn path. This work clarifies the micro-scale deformation mechanisms of 3D woven structures. The influence of weaving parameters including weft density and weaving structure on the geometric variations of fiber structures was analyzed. The connection between weaving parameters and unit cell variations was established within the scope of this study. The conclusions of this paper would be helpful for the design of preforms with stable fiber structure.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-11T01:15:14Z
      DOI: 10.1177/00219983221101173
       
  • Experimental analysis of tensile properties and essential work of fracture
           of fumed silica filled polypropylene toughened with thermoplastic
           polyolefin elastomer

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      Authors: Alireza Sadeghi, Faramarz Ashenai Ghasemi, Mohammad Fasihi, Pouya Rajaee
      First page: 2621
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this research, tensile and fracture behavior of polypropylene (PP) toughened with two types of thermoplastic polyolefin elastomers (TPOs) and filled with fumed silica are investigated. The TPOs are both propylene- and ethylene-based thermoplastic elastomers. Three percentages of TPO (0, 10, and 20 wt%) and four percentages of fumed silica (0, 1, 3, and 5 wt.%) are used. The addition of ethylene-based TPO to PP show higher values of modulus and tensile strength than propylene-based TPO. In contrast, propylene-based TPO show higher elongation at break which by increasing this type of TPO the elongation at break increase by 788%. The presence of fumed silica in the PP/TPOs blend improve the tensile strength and modulus but declined the elongation at break. Fracture behavior analysis of these compounds is performed by utilizing the essential work of fracture (EWF) approach. The outcomes demonstrate that both types of TPO in PP cause cavitation and fibrillar structures that increased the elastic and plastic work of fracture. Adding 10 wt.% ethylene- and propylene-based TPO to PP, the values of we and βwp increase by 63%, 100% and 124%, 123%, respectively. Morphological observations show that fumed silica is located mainly around TPOs particles or at the PP/TPOs interfaces. The addition of fumed silica also reduce the size of the pores, which indicate a slight reduction in the amount of plastic work. However, fumed silica with low percentages increase the amount of elastic work and then reduce it. Also, the compound with 10 wt.% propylene-based thermoplastic elastomers and 1 wt.% fumed silica had the best toughness-stiffness-strength balance among the samples based on the optimization results.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-13T11:39:54Z
      DOI: 10.1177/00219983221102603
       
  • Experimental investigation and multiscale simulation on the bending
           fatigue of SiCf/SiC composite vanes

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      Authors: Long Zhang, Jun Cheng, Chunhui Liu, Rongkai Qiu, Bingbin Liu, Wenlin Liao
      First page: 2641
      Abstract: Journal of Composite Materials, Ahead of Print.
      Plain woven composites are widely used in aerospace structures where vibration bending fatigue triggered by uneven airflow is the major failure mode, such as fan blades, turbine vanes, exhaust nozzle seals and etc. In this work, the multiscale fatigue simulation framework validated with composite coupons in previous studies, was investigated for the application to plain woven SiCf/SiC composite vanes. In order to validate the multiscale simulation results, bending fatigue test of the composite vanes was conducted on the basis of a vibration table upgraded with specially designed fixtures, where the in-situ damage images and natural frequency variations of the composite vanes were recorded through the whole fatigue testing process. The macroscopic and mesoscopic damage evolutions revealed by multiscale simulation were in good agreement with the in-situ observed images. Moreover, fatigue life was predicted based on the criterion of natural frequency descending 20%. As a result, the comparison between predicted and experimental fatigue life exhibits a scatter band of ±3.27. This study proves that the developed multiscale simulation method possesses good capability for the bending fatigue damage investigation and life prediction of plain woven composite structures.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-15T11:50:48Z
      DOI: 10.1177/00219983221102611
       
  • Radiation and lead nanoparticles effects on the mechanical properties of
           unidirectional carbon fiber/epoxy composites

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      Authors: Nisrin Abdelal, Rabie Abu Saleem, Ahmad Alsabbagh, Maram Al-Jarrah, Fatima Al- Jawarneh
      First page: 2653
      Abstract: Journal of Composite Materials, Ahead of Print.
      This study investigates the effects of two different parameters on the mechanical properties of carbon fiber-epoxy composites. The two addressed parameters are the composite’s exposure to gamma radiation with different doses, and the incorporation of lead nanoparticles with different weight percentages in the epoxy matrix. Unidirectional carbon fiber-epoxy composites are manufactured using the hand layup vacuum bagging process, and they are characterized by tensile tests and scanning electron microscope. The first part of the study entails fabricating composite laminates with different weight percentages of lead nanoparticles, namely, 0wt%, 1wt%, 2wt%, 3wt%, 4wt% and 5wt%. The results show that composites incorporating lead nanoparticles up to 3wt% exhibit monotonically improved tensile strength and Young’s modulus without compromising their ductility. Whereas, degradation of these mechanical properties is observed with increasing lead content beyond 3wt%. For the second part of the study, composite specimens are exposed to different doses of gamma radiation, namely, 0, 25, 50, 75 and 100 kGy. It is observed that the tensile strength, the modulus of toughness and the ductility of the composites improve for radiation exposures up to 25 kGy. However, radiation exposures higher than 25 kGy lead to deterioration in the tensile strength, modulus of toughness and Young’s modulus with negligible effect on the ductility.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-16T08:35:58Z
      DOI: 10.1177/00219983221101989
       
  • The effect of graphene and graphene oxide on defective single lap
           adhesively bonded joints

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      Authors: Esmaeil Abdi, Ata Khabaz-Aghdam, Hosein Hasan-nezhad, Bashir Behjat, EAS Marques, Yongming Yang, LFM da Silva
      First page: 2665
      Abstract: Journal of Composite Materials, Ahead of Print.
      The addition of nano-additives provides a path to improve joint performance. However, it is not clear if the use of these materials can alter the susceptibility of bonded joints to the presence of defects. This work aims to shed some light on this matter, by testing the performance of defective joints bonded with adhesives modified with nano-additives. Two different kinds of carbon-based nano-platelets, including graphene (G) and graphene oxide (GO), were used in this work as additives for adhesives used to bond single lap joints (SLJs). Bulk specimens, as well as three geometrically different SLJs were manufactured and tested. One configuration was manufactured without defects (WO), another with a disbond defect in the middle of the overlap, and another with a disbond defect on the edge of the overlap, known as a side defect (SD). These specimens were bonded with a neat epoxy adhesive and with the same adhesive modified with the addition of 0.3 wt% of G and GO. The addition of G and GO was found to improve Young’s modulus and the strength of the epoxy adhesive, while also decreasing its toughness. Dual effect of G and GO addition on improving the strength of the neat epoxy and WO SLJs while reducing the strength of some defective SLJs is also discussed using FT-IR and Raman spectrometry as well as scanning electron microscope pictures of the fracture surfaces.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-17T03:33:23Z
      DOI: 10.1177/00219983221101428
       
  • Effect of hybridization on crystallization behavior, mechanical
           properties, and toughening mechanisms in rubber-modified polypropylene
           flax fiber composites

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      Authors: Reza Bahrami, Reza Bagheri
      First page: 2677
      Abstract: Journal of Composite Materials, Ahead of Print.
      Nowadays, the significance of sustainability has urged composite manufacturers to replace traditional synthetic fibers with eco-friendly natural alternatives due to their environmental and economic benefits. This work aims to fabricate hybrid polypropylene (PP) composites with short flax fibers, octene-ethylene copolymer (POE) rubber particles, and maleic anhydride-grafted polypropylene (MAPP) compatibilizer. The main goal is to gain an insight into the combined effect of toughening mechanisms induced by the short fibers and rubber particles at the crack tip and wake of composites, which is a crucial step in reaching a balance between toughness and rigidity. In this regard, a novel microscopy strategy is taken to elucidate the operating mechanisms at the crack tip and crack wake of composites. Also, differential scanning calorimetry (DSC), tensile, and Charpy impact tests were employed to investigate the effect of hybridization on the crystallization behavior, tensile, and impact properties of composites. The experimental results showed that the combined effect of encouraging matrix plastic deformation and synergistic work of toughening mechanisms at the crack tip and wake in the MAPP-modified hybrid composites containing 30% flax fibers and 10% POE rubber particles yielded an optimal improvement of 315%, 135%, and 37% in impact strength, elastic modulus, and ultimate tensile strength, respectively, over the neat PP formulation.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-17T11:08:22Z
      DOI: 10.1177/00219983221101434
       
  • Experimental study of roving configuration’s influence on the flow field
           in a full-scale transparent pultrusion injection box

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      Authors: Christian Hopmann, Lorenz Wruck, Daniel Schneider, Kai Fischer
      First page: 2695
      Abstract: Journal of Composite Materials, Ahead of Print.
      Resin injection pultrusion gains increasing attention as it enables the use of highly reactive resins and resins sensitive to environmental conditions, while also decreasing the emission of harmful volatile organic compounds. Nevertheless, a comprehensive understanding of the flow field based on the geometric characteristics within open injection boxes is lacking due to a multitude of interdependent parameters. In this research, a novel setup for an experimental evaluation of the flow field in injection pultrusion practically is proposed. The setup consists of a full size, two-dimensionally tapered, transparent injection box that is installed within a pultrusion line and is operated with non-reactive fluids. Investigations are conducted with two different guide plate setups. Pulling forces and filling degree are evaluated for four pulling speeds, four fiber volume fractions and for four fluids. The non-reactive fluids are three grades of sucrose solution and Mesamoll with viscosities ranging from 13 to 246 mPa.s.Obtained pulling forces correlate linearly with the product of viscosity and pulling speed. Better fiber wettability properties and additional fiber guiding plates result in lower pulling forces. Backflow fill length displays an asymptotic correlation to pulling forces, indicating different governing mechanisms for these two phenomena. Backflow fill length corresponds directly with resin residence time, which ranges from about 10 to 3 min. The results indicate the possibility of manipulating pressure build-up and resin residence time separately, which would enable tailoring injection box cavity geometries systematically to a specific profile.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-20T03:02:38Z
      DOI: 10.1177/00219983221085632
       
  • Translaminar mode-I fracture toughness experiment of pultruded GFRP
           laminates using extended compact tension specimen

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      Authors: Zhihua Xiong, Yang Meng, Chenyu Zhao, Yuqing Liu
      First page: 2713
      Abstract: Journal of Composite Materials, Ahead of Print.
      This paper conducted experiments and theoretic analysis of the fracture performance of pultruded GFRP (Glass Fiber Reinforced Polymers) laminates. The mode-I fracture toughness of pultruded GFRP laminates was evaluated by the eccentrically loaded, Extended Compact Tension (ECT) specimen. The geometry of specimen and experimental procedure refer to ASTM E1922. A total of 16 specimens were tested, which included 0° and 90° roving orientation. Finite element analysis with the Virtual Crack Closure Technique (VCCT) was implemented to calibrate the experimental results. A correction function for normalized notch length was proposed for pultruded GFRP translaminar fracture toughness. Carpet plot was designed to discuss the relationship between fiber volume ratio and fracture toughness, which demonstrated that the fracture toughness strongly correlated with the fiber volume ratio. Also, the effect of fraction of 0° layers on fracture toughness and material orthotropy was studied. The relationship of material orthotropy parameter and fracture toughness was discussed.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-18T06:25:54Z
      DOI: 10.1177/00219983221104243
       
  • Study of mechanical properties and wear resistance of nanostructured Al
           1100/TiO2 nanocomposite processed by accumulative roll bonding

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      Authors: Ismail R. Najjar, Marwa Elmahdy
      First page: 2727
      Abstract: Journal of Composite Materials, Ahead of Print.
      Aluminum (Al) composites have been extensively developed for automotive applications due to their high specific strength. Therefore, in this study, an Al-titanium dioxide (TiO2) nanocomposite was processed using the accumulative roll bonding (ARB) process. The mechanical characteristics of monolithic and nanocomposites specimens made with 0, 1, 2, and 3 wt% TiO2 nanoparticles as reinforcement were studied at several ARB passes. According to the microstructure of the composites, rolling after five passes achieves a homogenous distribution of reinforcement particles, ultrafine and elongated grains of the matrix. After five ARB passes, the TiO2 particles were uniformly dispersed. Finally, scanning electron microscopy and energy dispersive spectroscopy revealed that the Al-TiO2 nanocomposite had an appropriate dispersion of TiO2 nanoparticles. Vickers microhardness improves as the number of accumulative roll bonding passes increases. Furthermore, after five passes, Vickers microhardness testing revealed that the sample with 3%TiO2 has the greatest hardness value of 112 HV, which is significantly greater than the 44 HV hardness value of the ARB-processed aluminum. The mechanical properties of the specimens, yield and ultimate strengths, improved with the addition of TiO2 nanoparticles. Due to good bonding among the components, mechanical parameters such as microhardness and tensile strength were more than three times better than the Al matrix.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-17T08:24:21Z
      DOI: 10.1177/00219983221103636
       
  • Bending behavior and geometrical optimization of five-layered corrugated
           sandwich panels with equal in-plane principal stiffness

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      Authors: A Vakilifard, H Mazaheri, M Shaban
      First page: 2739
      Abstract: Journal of Composite Materials, Ahead of Print.
      In this work, bending properties of five-layer sandwich panels with corrugated three-layer core are investigated both numerically and experimentally. Sheet metal forming is employed to construct the corrugated core and three-point bending tests are performed to experimentally evaluate the bending behavior of the panels. Besides, reliable finite element model is developed and validated by the experimental results. The results show that the phase difference of the external core has no considerable effect on the panel behavior. Next, the effect of orientation for the corrugated cores is studied for two 0/90/0 and 90/0/90 layups. The results show that bending rigidity of 90/0/90 is greater than other case due to more bending rigidity of the external cores. To design an optimum sandwich panel, genetic algorithm is utilized by constraining the mass and height of the panel. For optimization purpose, an analytical formulations that is validated by presented experimental and numerical results are used. Based on optimization results, optimized sandwich panel is constructed and exposed to TPB test. Good agreement is observed between all the numerical, analytical and experimental methods. The results indicate that the optimized configuration can achieve notable higher bending resistance in the same weight especially for the 90/0/90 case. Finally, an isotropic multilayered sandwich panel is introduced and optimized to overcome the drastic anisotropic properties of corrugated cores. The optimized isotropic panel have equal bending rigidity in two principal axes of the panel.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-21T03:04:07Z
      DOI: 10.1177/00219983221082236
       
  • Modeling of the creep behavior of epoxy/yerba-mate residue composites

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      Authors: Roberta Motta Neves, Eduardo Fischer Kerche, Francisco Maciel Monticeli, Heitor Luiz
      First page: 2755
      Abstract: Journal of Composite Materials, Ahead of Print.
      This work presents the short-term creep behavior of novel epoxy composites reinforced by post-consumed yerba-mate (YM). Particulate composites were manufactured using 5, 10, and 20 wt.% of YM. The composite morphologies were related to the dynamic mechanical and creep behavior at the glassy state (∼30°C). Creep tests were performed using three different stress loads (1.5, 3.0, and 6.0 MPa). Weibull model, Artificial Neural Network (ANN) approach and Response Surface Methodology (RSM) were used to fit the experimental curves and to predict results. A better fit was obtained using the ANN approach than the Weibull model due to the capability of ANN to learn from own data and in fitting complex nonlinear data. The RSM approach proved to be an intelligent and reliable technique to access a higher range of results, reducing experimental time and cost and keeping statistical significance. Also, the present methodology can be extended to model and predict other properties and/or optimize parameters.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-21T06:23:43Z
      DOI: 10.1177/00219983221104176
       
  • Finite element modelling of the single fibre composite fragmentation test
           with comparison to experiments

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      Authors: Yanmei Cao, Yang Xu, Philip Harrison, Edward D McCarthy, Daniel M Mulvihill
      First page: 2765
      Abstract: Journal of Composite Materials, Ahead of Print.
      This paper develops a finite element (FE) model of the single fibre fragmentation test designed for direct comparison with experimental results on an E-glass/epoxy system by McCarthy et al. (2015). Interface behaviour is modelled via a cohesive surface, and stochastic Weibull fibre strengths (determined by independent experiments) assigned at random to the elements along the fibre. Predictions from the model agree with experiment for a range of outputs: The evolution of the number of fibre breaks with strain is similar and breaks occur at random locations as required. The model also captures a transition to a Uniform (rather than Weibull) statistical distribution of break locations at later stages of the test consistent with recent experiments. The evolution of the cumulative distribution of fragment lengths is also similar to that of the experiment. In addition, fibre axial stress and interfacial shear stress distributions conform with experimental observation. Correct model predictions of break locations confirm the approach taken on assigning stochastic (Weibull) strengths along the fibre. The effectiveness of the FE model in capturing a number of key aspects of the fragmentation phenomenon suggest its usefulness as a tool in analysing and interpreting fibre fragmentation tests, including back-calculation of interfacial shear strength.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-22T01:59:44Z
      DOI: 10.1177/00219983221095901
       
  • Response of glass/carbon hybrid composites subjected to repeated low
           velocity impacts

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      Authors: Federica Donadio, Pietro Ferraro, V Lopresto, Vito Pagliarulo, Ilaria Papa, Massimo Rippa, Pietro Russo
      First page: 2789
      Abstract: Journal of Composite Materials, Ahead of Print.
      This work investigated the effect of repeated low-velocity impacts at different energy levels on vinyl ester composite laminates. In particular, hybrid composite laminates made by carbon woven fabric and glass woven fabric impregnated by vinyl ester resin were subjected to 1, 5 and 10 impacts for three different energy levels (U=5 J, 10 J and 20 J). The multi-impact damage evolution was studied by combining several non-destructive techniques such as Pulsed Thermography, Electronic Speckle Pattern Interferometry and Ultrasonic C-scanning. Along with images of detected damaged areas, some impact parameters such as contact force, deflection and absorbed energy were provided.
      Citation: Journal of Composite Materials
      PubDate: 2022-05-20T02:06:25Z
      DOI: 10.1177/00219983221089716
       
 
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