Subjects -> INSTRUMENTS (Total: 62 journals)
Showing 1 - 16 of 16 Journals sorted alphabetically
Annali dell'Istituto e Museo di storia della scienza di Firenze     Hybrid Journal  
Applied Mechanics Reviews     Full-text available via subscription   (Followers: 27)
Bulletin of Social Informatics Theory and Application     Open Access   (Followers: 1)
Computational Visual Media     Open Access   (Followers: 4)
Devices and Methods of Measurements     Open Access  
Documenta & Instrumenta - Documenta et Instrumenta     Open Access  
EPJ Techniques and Instrumentation     Open Access  
European Journal of Remote Sensing     Open Access   (Followers: 9)
Experimental Astronomy     Hybrid Journal   (Followers: 39)
Flow Measurement and Instrumentation     Hybrid Journal   (Followers: 18)
Geoscientific Instrumentation, Methods and Data Systems     Open Access   (Followers: 4)
Geoscientific Instrumentation, Methods and Data Systems Discussions     Open Access   (Followers: 1)
IEEE Journal on Miniaturization for Air and Space Systems     Hybrid Journal   (Followers: 2)
IEEE Sensors Journal     Hybrid Journal   (Followers: 103)
IEEE Sensors Letters     Hybrid Journal   (Followers: 3)
IJEIS (Indonesian Journal of Electronics and Instrumentation Systems)     Open Access   (Followers: 3)
Imaging & Microscopy     Hybrid Journal   (Followers: 9)
InfoTekJar : Jurnal Nasional Informatika dan Teknologi Jaringan     Open Access  
Instrumentation Science & Technology     Hybrid Journal   (Followers: 7)
Instruments and Experimental Techniques     Hybrid Journal   (Followers: 1)
International Journal of Applied Mechanics     Hybrid Journal   (Followers: 7)
International Journal of Instrumentation Science     Open Access   (Followers: 40)
International Journal of Measurement Technologies and Instrumentation Engineering     Full-text available via subscription   (Followers: 2)
International Journal of Metrology and Quality Engineering     Full-text available via subscription   (Followers: 4)
International Journal of Remote Sensing     Hybrid Journal   (Followers: 274)
International Journal of Remote Sensing Applications     Open Access   (Followers: 43)
International Journal of Sensor Networks     Hybrid Journal   (Followers: 4)
International Journal of Testing     Hybrid Journal   (Followers: 1)
Journal of Applied Remote Sensing     Hybrid Journal   (Followers: 83)
Journal of Astronomical Instrumentation     Open Access   (Followers: 3)
Journal of Instrumentation     Hybrid Journal   (Followers: 32)
Journal of Instrumentation Technology & Innovations     Full-text available via subscription   (Followers: 1)
Journal of Medical Devices     Full-text available via subscription   (Followers: 5)
Journal of Medical Signals and Sensors     Open Access   (Followers: 3)
Journal of Optical Technology     Full-text available via subscription   (Followers: 5)
Journal of Sensors and Sensor Systems     Open Access   (Followers: 11)
Journal of Vacuum Science & Technology B     Hybrid Journal   (Followers: 2)
Jurnal Informatika Upgris     Open Access  
Measurement : Sensors     Open Access   (Followers: 3)
Measurement and Control     Open Access   (Followers: 36)
Measurement Instruments for the Social Sciences     Open Access  
Measurement Science and Technology     Hybrid Journal   (Followers: 7)
Measurement Techniques     Hybrid Journal   (Followers: 3)
Medical Devices & Sensors     Hybrid Journal  
Medical Instrumentation     Open Access  
Metrology and Measurement Systems     Open Access   (Followers: 6)
Microscopy     Hybrid Journal   (Followers: 8)
Modern Instrumentation     Open Access   (Followers: 50)
Optoelectronics, Instrumentation and Data Processing     Hybrid Journal   (Followers: 4)
PFG : Journal of Photogrammetry, Remote Sensing and Geoinformation Science     Hybrid Journal  
Photogrammetric Engineering & Remote Sensing     Full-text available via subscription   (Followers: 29)
Remote Sensing     Open Access   (Followers: 54)
Remote Sensing Applications : Society and Environment     Full-text available via subscription   (Followers: 8)
Remote Sensing of Environment     Hybrid Journal   (Followers: 93)
Remote Sensing Science     Open Access   (Followers: 24)
Review of Scientific Instruments     Hybrid Journal   (Followers: 22)
Sensors and Materials     Open Access   (Followers: 2)
Solid State Nuclear Magnetic Resonance     Hybrid Journal   (Followers: 3)
Standards     Open Access  
Transactions of the Institute of Measurement and Control     Hybrid Journal   (Followers: 13)
Труды СПИИРАН     Open Access  
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Journal Cover
International Journal of Applied Mechanics
Journal Prestige (SJR): 0.793
Citation Impact (citeScore): 2
Number of Followers: 7  
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1758-8251 - ISSN (Online) 1758-826X
Published by World Scientific Homepage  [119 journals]
  • Numerical Investigation of an Orthotropic Plate with Interactions of
           Crack, Inclusions and Voids under Uniaxial Tensile Loading by XFEM
    • Authors: Achchhe Lal, M. B. Vaghela
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This work is focused to investigate the effect of various discontinuities like cracks, inclusions and voids for an orthotropic plate, to evaluate the normalized mixed-mode stress intensity factors (NMMSIFs) by implementing the extended finite element method (XFEM) under uniaxial tensile loading though considering the various numerical examples. The NMMSIFs are investigated with the interaction of crack, single- and multi-inclusions/voids for an orthotropic plate. The effect of NMMSIFs is analyzed for an orthotropic plate with several orthotropy axis orientations by changing the position of single- and multi-inclusions/voids while aligned, above and away with respect to an edge crack of the plate and for the both side inclusions/voids aligned the center crack. It is also investigated for the effect of various shapes of inclusions/voids for an edge crack orthotropic plate under uniaxial tensile loading using XFEM.
      Citation: International Journal of Applied Mechanics
      PubDate: 2021-01-11T08:00:00Z
      DOI: 10.1142/S1758825120501136
  • A Simple Truly Self-Starting and L-Stable Integration Algorithm for
           Structural Dynamics
    • Authors: Jinze Li, Kaiping Yu
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This paper proposes a novel composite two sub-step implicit method to effectively solve structural dynamic problems. The main highlight of the new method lies that it is truly self-starting and so avoids computing the initial acceleration vector, but the second-order accurate acceleration output can be still provided. Besides, the new method does not sacrifice other desired numerical characteristics, such as the identical second-order accuracy, unconditional stability (L-stability) and no overshoots. As with the existing Bathe algorithm, the new method also includes a unique algorithmic parameter [math] to adjust numerical dissipation imposed in the low-frequency range. Numerical spectral analysis and examples show that the new method with [math] is highly recommended solving various dynamical problems.
      Citation: International Journal of Applied Mechanics
      PubDate: 2021-01-09T08:00:00Z
      DOI: 10.1142/S1758825120501197
  • Research on the Propagation Characteristics of Fatigue Cracks on Rail
    • Authors: Ruipeng Gao, Shanshan Fan
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      To solve the problem of rail crack propagation, inadequate studies mainly use a two-dimensional (2D) model for macroscopic crack analysis owing to the failure of accurately reflecting the contact status between the wheel and rail. In this work, we use ANSYS software to establish a three-dimensional (3D) wheel–rail contact model to clarify the microcracks on the rail tread. The influence of the number of horizontal and vertical cyclic loads during the rail’s fatigue crack growth is analyzed. The results suggest that as the number of vertical and tangential cyclic loads increases, the length of the rail crack increases. Using experiments to verify the law between the number of cyclic loads and rail crack growth length, the experimental findings proved that the law of crack growth is basically consistent with the aforementioned simulation results and the outcome of the Paris expansion curve, verifying the validity of the simulation results.
      Citation: International Journal of Applied Mechanics
      PubDate: 2021-01-06T08:00:00Z
      DOI: 10.1142/S1758825120501215
  • Numerical Investigation on Mixed Mode (I-II) Fracture Propagation of CCBD
           Specimens Under Confining Pressure
    • Authors: Jiuzhou Huang, Jianxiong Li, Xin Pan, Tianzhou Xie, Wen Hua, Shiming Dong
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      A new numerical method, verified by the analytical solution of the weight functions and experimental paths, is developed to evaluate the crack initiation and propagation generally in mixed mode (I-II). This numerical method combining the interaction integral method and the maximum tangential stress (MTS) criterion is based on the finite element method of secondary development. The influence of combined confining pressure and diametric forces on crack propagation trajectories for CCBD specimens are studied. It is indicated that the crack propagation direction independent of the confining pressure keeps the same with the line of original crack as the loading angle is equal to [math]. But when the loading angle is greater than [math], the curvature of the curve trajectory in the early stage of crack propagation increases with a larger confining pressure. Further, it is found that larger values of the loading angle and relative length will make the effect of confining pressure more significant at the early stage of crack growth.
      Citation: International Journal of Applied Mechanics
      PubDate: 2021-01-05T08:00:00Z
      DOI: 10.1142/S1758825120501112
  • A Novel Piezoelectric System for Thermal Energy Harvesting from
           Temperature Fluctuations
    • Authors: Naser S. Al-Huniti, Moh’d A. Al-Nimr
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This study presents the analytical modeling of a novel, simple, practical, and environmentally-friendly piezoelectric thermal energy harvester which consists of two main components: a substance exposed to a fluctuating heat source (a solid elastic material or a pressurized gas) and a piezoelectric layer to generate electrical power. Thermal variations resulting from the fluctuating heat source within the substance are converted into pressure fluctuations in the piezoelectric layer, which generates useful electric power. Unlike the widely-used thermal energy harvesters that utilize thermoelectric materials, thermal power cycles, and pyroelectric generators, the proposed system utilizes piezoelectric materials that are common for their electromechanical conversion characteristics. Thermoelastic analysis is carried out to illustrate and evaluate the performance of the model. It is found that the generated power is affected by the heat source intensity and frequency, thermal losses, properties of the medium exposed to the thermal fluctuations, and the piezoelectric properties. It is also found that the model that uses a solid elastic material is more efficient than the one that uses a pressurized gas.
      Citation: International Journal of Applied Mechanics
      PubDate: 2021-01-05T08:00:00Z
      DOI: 10.1142/S1758825120501124
  • Control of Separation Zone Behind a Flat Plate Under the Ground Effect
           Using Porous Lamination, Mathematical Modeling
    • Authors: Kazem Reza-Asl, Saeed Foshat
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Examination of the flat and curved plates flying close to the ground is an appropriate approach in understanding the complexity of flow behavior near a solid or liquid surface. When a body flies close to a surface, the vortex structure behind the body is changed; therefore, the resultant lift force is more than zero. This phenomenon is named “ground effect”. In this study, flat and curved plates submerged in the ground boundary layer were numerically investigated under the ground effect. After validating the desired numerical code, the influences of adding porous layer to the plates with [math] attack angle were examined on vortex structure and flow separation behind the plate under the ground effect. The obtained results revealed that using a porous zone significantly reduced the separation zone and changed the vortex shedding structure downstream of the plates.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501094
  • Computational Investigation of the Stability of Stenotic Carotid Artery
           under Pulsatile Blood Flow Using a Fluid-Structure Interaction Approach
    • Authors: Amirhosein Manzoori, Famida Fallah, Mohammadali Sharzehee, Sina Ebrahimi
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Stenosis can disrupt the normal pattern of blood flow and make the artery more susceptible to buckling which may cause arterial tortuosity. Although the stability simulations of the atherosclerotic arteries were conducted based on solid modeling and static internal pressure, the mechanical stability of stenotic artery under pulsatile blood flow remains unclear while pulsatile nature of blood flow makes the artery more critical for stresses and stability. In this study, the effect of stenosis on arterial stability under pulsatile blood flow was investigated. Fluid–structure interaction (FSI) simulations of artery stenosis under pulsatile flow were conducted. 3D idealized geometries of carotid artery stenosis with symmetric and asymmetric plaques along with different percentages of stenosis were created. It was observed that the stenosis percentage, symmetry/asymmetry of the plaque, and the stretch ratio can dramatically affect the buckling pressure. Buckling makes the plaques (especially in asymmetric ones) more likely to rupture due to increasing the stresses on it. The dominant stresses on plaques are the circumferential, axial and radial ones, respectively. Also, the highest shear stresses on the plaques were detected in [math] and [math] planes for the symmetric and asymmetric stenotic arteries, respectively. In addition, the maximum circumferential stress on the plaques was observed in the outer point of the buckled configuration for symmetric and asymmetric stenosis as well as at the ends of the asymmetric plaque. Furthermore, the artery buckling causes a large vortex flow at the downstream of the plaque. As a result, the conditions for the penetration of lipid particles and the formation of new plaques are provided.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501100
  • Generation of Plastic Collapse Load Boundaries of a Pressurized
           Cylindrical Vessel/Radial Nozzle Structure Subjected to Nozzle Bending
           Loadings Utilizing Various Plastic Collapse Load Techniques
    • Authors: Hany Fayek Abdalla
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This research focuses on generating the plastic collapse load boundaries of a cylindrical vessel with a radial nozzle via employing three different plastic collapse load techniques. The three plastic collapse load techniques employed are the plastic work curvature (PWC) criterion, the plastic work (PW) criterion, and the twice-elastic-slope (TES) method. Mathematical based determination of plastic collapse loads is presented and employed concerning both the PWC and the PW criteria. A validation study is initially conducted on a pressurized 90-degree pipe bend structure subjected to in-plane closing bending via finite element analyses along with an elaborate explanation of the mathematical approaches for determining the plastic collapse loads via the PWC and the PW criteria. Outcomes of the validation study revealed very good outcomes for the three techniques. Accordingly, the aforementioned three techniques are utilized to determine the plastic collapse load boundaries of a pressurized cylindrical vessel/nozzle structure subjected to in-plane (IP) and out-of-plane (OP) bending loadings applied on the nozzle one at a time. The TES method revealed considerate limitations when applied within the medium to the high internal pressure spectra. It is shown that both the PWC and the PW criteria outperform the TES method in computing the plastic collapse loads. The vessel/nozzle structure revealed relatively higher plastic collapse moment boundaries under IP bending as compared to OP bending. Conclusively, methodical steps are devised for determining the plastic collapse loads via the PWC and the PW criteria for the ease of systematic application on pressurized structures in general.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S175882512050115X
  • Optimization of Viscoelastic Metamaterials for Vibration Attenuation
    • Authors: Ratiba F. Ghachi, Wael I. Alnahhal, Osama Abdeljaber, Jamil Renno, A. B. M. Tahidul Haque, Jongmin Shim, Amjad Aref
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Metamaterials (MMs) are composites that are artificially engineered to have unconventional mechanical properties that stem from their microstructural geometry rather than from their chemical composition. Several studies have shown the effectiveness of viscoelastic MMs in vibration attenuation due to their inherent vibration dissipation properties and the Bragg scattering effect. This study presents a multiobjective optimization based on genetic algorithms (GA) that aims to find a viscoelastic MM crystal with the highest vibration attenuation in a chosen low-frequency range. A multiobjective optimization allows considering the attenuation due to the MM inertia versus the Bragg scattering effect resulting from the periodicity of the MM. The investigated parameters that influence wave transmission in a one-dimensional (1D) MM crystal included the lattice constant, the number of cells and the layers’ thickness. Experimental testing and finite element analysis were used to support the optimization procedure. An electrodynamic shaker was used to measure the vibration transmission of the three control specimens and the optimal specimen in the frequency range 1–1200[math]Hz. The test results demonstrated that the optimized specimen provides better vibration attenuation than the control specimens by both having a band-gap starting at a lower frequency and having less transmission at its passband.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501161
  • Numerical Study of Detonation Propagation in an Insensitive High Explosive
           Arc with Confinement Materials
    • Authors: Yupei Qin, Kuibang Huang, Huan Zheng, Yousheng Zhang, Xin Yu
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Detonation propagation in a confined circular arc configuration of an insensitive high explosive PBX9502 is investigated via numerical simulation in this paper. We introduce a steady detonation wave entering the explosive arc with confinements of stainless steel, and then it undergoes a transition phase and reaches a new steady state with a constant angular speed eventually. The influences of the inner and the outer confinements on the propagating detonation wave as well as the characteristics of the detonation driving zone (DDZ) in the steady state are discussed, respectively. Ignition and Growth (I&G) reaction rate and Jones–Wilkins–Lee (JWL) equations of state for the reactants and the products of PBX9502 are employed in the numerical simulations on the basis of a two-dimensional Eulerian code. The equation of state for stainless steel is in the Grüneisen form with a linear shock speed–particle speed Hugoniot relationship. Our results show that the inner confinement dominates the evolution of the detonation wave and the outer confinement only takes effect in a local region near the outer boundary within a limited initial stage during the transition phase. As for the steady state, the existence of the inner confinement makes the DDZ possess a certain width on the inner boundary. While as to the outer part of the detonation wave, the width of the DDZ decreases until the sonic locus intersects with the detonation front shock, which results in the detachment of the DDZ from the outer boundary and makes the detonation propagation fully independent of the outer confinement.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501173
  • Numerical Simulation of Localized Bulging in an Inflated Hyperelastic Tube
           with Fixed Ends
    • Authors: Zehui Lin, Linan Li, Yang Ye
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      When a hyperelastic tube is inflated, the inflation pressure has a maximum for almost all rubber material models, but has no maximum for commonly used arterial models. It is generally believed that the pressure having a maximum is a necessary condition for localized bulging to occur, and therefore aneurysms cannot be modeled as a mechanical bifurcation phenomenon. However, recent theoretical studies have shown that if the axial stretch is fixed during inflation, localized bulging may still occur even if a pressure maximum does not exist in uniform inflation. In this paper, numerical simulations are conducted to confirm this theoretical prediction. It is also demonstrated that if the axial pre-stretch is not sufficiently large, unloading near the two ends can reduce the axial stress to a value close to zero and Euler-type buckling then occurs.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501185
  • An Analytical Model for the Stiffness of Slotted Disk Springs
    • Authors: Junshan Wang, Lei Jian, Weijie Leng, Chongmin She, Zhijun Sun
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The slotted disk spring is an important part of ultrasonic motors. Its mechanical properties directly affect the running stability of the motor. In this study, an analytical model is developed to solve the preload problem for slotted disk springs used in ultrasonic motors. The outer conical ring of the slotted disk spring is modeled using the conical shell theory. The inner separated teeth are modeled by the cantilever beam theory. An analytical mechanical model for the force-displacement relationship of the entire slotted disk spring is then developed. The results of the experiment based on a force-displacement transducer and the results from the analytical model, a finite element calculation, and the Schremmer formula are compared to validate the analytical model. The results show that the proposed model has the highest accuracy. Parameter-sensitivity analysis for the slotted disk spring is finally performed, and a new slotted disk spring with a long zero-stiffness interval is designed for a 40[math]mm traveling wave rotary ultrasonic motor.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-30T08:00:00Z
      DOI: 10.1142/S1758825120501203
  • Lifetime Assessment of the Technological Equipment for a Robotic Workplace
    • Authors: Jozef Bocko, Ingrid Delyová, Peter Frankovský, Vojtech Neumann
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In technical practice, problems associated with material fatigue often arise. These problems can be caused by errors in the stages of design, production or use of the structure, e.g., by incorrect determination of service life, incorrect dimensioning of construction details, incorrect welds, etc. In the case of welds, such issues may be caused due to the fact that the base material is not welded through or due to the presence of a fistula inside the weld, the presence of slags or cracks inside the weld, etc. The task of the designer is to design a technological unit that meets all the requirements of future users. Components have to be designed for fatigue so that there is an acceptable level of probability that their operation will be satisfactory during their operation life. One of the most common causes of failure of welded joints is fatigue. Fatigue design life is understood to be the reference period of time during which the structure is required to serve safely and not to fail with an acceptable probability. This article deals with the assessment of service life of a welded supporting structure of technological equipment. The structure was subjected to strength analysis. The obtained FEA results were needed to plot the extreme amplitudes of the stresses. Based on the obtained stress vibrations and the welds used, the service life of the structure was assessed by means of the standard.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-08T08:00:00Z
      DOI: 10.1142/S1758825120500970
  • The Interrelated Mechanics of Poroelastic Gels in Time- and
           Frequency-Domain Detected by Indentation
    • Authors: Alvin Maningding, Mojtaba Azadi
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The force response of poroelastic materials including poroelastic gels to indentation is known to be time- and space-dependent (i.e., a function of indenter shape and size). Despite the complexity of the poroelastic response and in contrast to viscoelastic mechanics, poroelastic mechanics can be captured in terms of several intrinsic mechanical properties, such as elasticity, permeability, and Poisson ratio. While these intrinsic properties can be found from time-domain or frequency-domain master curves, indentation is usually conducted and analyzed only in the time domain using stress-relaxation or creep experiments. This paper advocates using frequency-domain analysis of poroelastic gels by reviewing and analyzing the relevant works of the literature. The analysis and methods, proposed here, enable researchers to characterize dynamic moduli of poroelastic gels in frequency domain using only a few experimental defining parameters. The authors have intentionally provided extensive details and background, to make this work useful for researchers who consider using frequency-domain analysis for the first time. This work reviews and explains the instantaneous elastic modulus, depicted over normalized time as a unifying and understandable set of master curves for time-domain stress relaxation tests on poroelastic gels for cylindrical, conical, and spherical indenters. The dynamic elastic modulus, depicted over normalized frequency, are derived symbolically and numerically and explained for the first time as master curves with simple transfer function in the frequency domain for presenting poroelastic mechanics of gels.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-08T08:00:00Z
      DOI: 10.1142/S1758825120501033
  • Nonlinear Resonance Analysis of Dielectric Elastomer Actuators Under
           Thermal and Isothermal Conditions
    • Authors: Amin Alibakhshi, Hamidreza Heidari
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this paper, nonlinear resonance characteristics of a dielectric elastomer actuator are investigated with special consideration on the thermal effects. A finite thermo-elasticity model based on the Gent model is constructed to analyze the vibrational response of the system. The equation of motion is derived via the Euler–Lagrange method. The multiple scales method and the Taylor series expansion are used to solve the governing equation. Nonlinear resonant responses of the system such softening/hardening and jump are explored. Furthermore, the influences of different system parameters including temperature, limiting stretch, damping, mechanical load, relative permittivity and voltage on the frequency response curves are explored. The results are compared with those obtained in the isothermal state, and those solved by numerical methods. It is found that both softening and hardening-type nonlinearities occur in the system in both non-thermal and thermal conditions.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-12-04T08:00:00Z
      DOI: 10.1142/S1758825120501008
  • Influence of Large Amplitude Vibration on Geometrically Imperfect Sandwich
           Curved Panels Embedded with Gradient Metallic Cellular Core
    • Authors: Mohammad Amir, Mohammad Talha
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This study investigates the influence of large amplitude vibration on geometrically imperfect sandwich curved panels embedded with gradient metallic cellular (GMC) core using an efficient nonlinear finite element formulation based on higher-order shear deformation theory (HSDT). The cores of the sandwich curved panels are assumed to have three distinct porosity distributions. The material properties of the sandwich curved panel’s GMC core layer vary in the thickness direction as a function of porosity coefficient and mass density. The present nonlinear finite element model is validated with limited results available in the open literature, and few new results are also computed that can be used as a benchmark solution. The influence of porosity coefficient, porosity distribution type, amplitude ratio, imperfection amplitude, and curvature ratio on the free vibration characteristics of the geometrically imperfect sandwich curved panels with the GMC core are studied in detail.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-30T08:00:00Z
      DOI: 10.1142/S1758825120500994
  • Hybrid Finite Element Analysis of Heat Conduction in Orthotropic Media
           with Variable Thermal Conductivities
    • Authors: Wenkai Qiu, Keyong Wang, Peichao Li
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      A hybrid finite element method is proposed for the heat conduction analysis with variable thermal conductivities. A linear combination of fundamental solutions is employed to approximate the intra-element temperature field while standard one-dimensional shape functions are utilized to independently define the frame temperature field along the element boundary. The influence of variable thermal conductivities embeds in the intra-element temperature field via the fundamental solution. A hybrid variational functional, which involves integrals along the element boundary only, is developed to link the two assumed fields to produce the thermal stiffness equation. The advantage of the proposed method lies that the changes in the thermal conductivity are captured inside the element domain. Numerical examples demonstrate the accuracy and efficiency of the proposed method and also the insensitivity to mesh distortion.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120500982
  • Modeling of Damage Evolution in a Patient-Specific Stenosed Artery upon
           Stent Deployment
    • Authors: Fatemeh Rouhani, Behrooz Fereidoonnezhad, Mohammad Reza Zakerzadeh, Mostafa Baghani
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      Computational models provide a powerful tool for pre-clinical assessment of medical devices and early evaluation of potential risks to the patient in terms of plaque fragmentation and in-stent restenosis (ISR). Using a suitable constitutive model for arterial tissue is key for the development of a reliable computational model. Although some inelastic phenomena such as stress softening and permanent deformation likely occur due to the supra-physiological loading of arterial tissue during the stenting procedure, hyperelastic constitutive models have been employed in most of the previously developed computational models. This study presents a finite element model for stent deployment into a patient-specific stenosed artery while inelastic arterial behaviors due to supra-physiological loading of the tissue have been considered. Specifically, the maximum stress in the plaque and the arterial layers which is the main cause of plaque fracture during stent deployment and the surgically-induced injury (damage) in the arterial wall, as the main cause of ISR, are presented. The results are compared with the commonly-used hyperelastic behavior for arterial layers. Furthermore, the effects of arterial material parameter variation, analogues to different patients, are investigated. A higher amount of damage is predicted for the artery which shows a higher stress in a specific strain.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S175882512050101X
  • Time-Dependent Deflection Responses of Porous FGM Structure Including
           Pattern and Porosity
    • Authors: Prashik Malhari Ramteke, Brijesh Patel, Subrata Kumar Panda
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The transient deflections of the functionally graded structure considering various types of patterns (power-law, sigmoid and exponential) are computed in this paper numerically using a higher-order shear deformation model. Also, the model includes variable distribution of porosity, i.e., the even and the uneven types, through the thickness direction ([math]-axis) of the graded panel. The transient deflection data are obtained computationally via a customized computer code prepared in MATLAB in association with Newmark’s constant acceleration-type time-integration technique. The model accuracy is checked by comparing the present time-dependent data with the published transient deflection values and the simulated results (modeled through a commercial package, ANSYS). Further, the effects of several design parameters (aspect ratio, thickness ratio, power exponent, porosity index, type of porosity, geometry and end-support conditions) on the transient deflection responses of the graded structure are computed through the derived numerical model.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501021
  • Novel Mathematical-Statistical Models for the Distribution of Fatigue Life
           and Residual Strength for Fiber Reinforced Polymer Composites
    • Authors: Jiqiang Hu, Chunming Ji, Shuai Chen, Shuai Li, Bing Wang, Zhengong Zhou
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      For the distribution prediction of fatigue life and residual strength of fiber reinforced polymer composites, the existing models have the disadvantages of imprecision, instability and single applicability. A novel S–N curve model and a residual strength degradation model were first developed, which are independent and uncorrelated. After verifying their reliability, the statistical distribution models of fatigue life and residual strength were further derived and verified by using experimental data from literature. Compared with the other models, the proposed models can perfectly predict the probability distribution of fatigue life and residual strength under different materials, stacking sequences and stress levels, showing excellent prediction accuracy, stability and applicability.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501045
  • Methods and Criterion for Adaptive Ice Accretion Simulation: Mesh Boundary
           Merge and Reconstruction
    • Authors: Zhao Li, Xiaoyan Tong, Jing Sun, Feng Jiang, Guangjun Yang, Jingping Xiao, Yu Shi
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The strong coupling effect of two-phase flow and ice accompanies the ice accretion process of aircraft and wind turbine in damp and cold environment. A method based on the Eulerian two-phase flow, domain discretization of finite volume method (FVM) and finite element method (FEM), and fluid–solid coupling for numerical simulation of ice accretion is presented in this paper. In addition, the icing process of two-dimensional (2D) ice accretion on airfoils is investigated. It is found that the difference between simulation results and experimental data comes from the phase changes of local collection efficiency [math], which is a function of local vortex strength and changes with time. Furthermore, with the ice accretion, it is easy to generate a negative or distortion grid because of the inappropriate mesh boundary merge and reconstruction, leading to an inaccurate ice prediction result. Based on the influence region of icing accretion and capturing the complex flow characteristics of the near-wall region, a dynamic and partition adaptive grid reconstruction strategy between macroscopic ice layer and microscopic ice crystal growth process is established. This is then used to build the ice accretion step adjustment strategy for multi-step simulation method under different icing conditions. The droplet collection efficiency distribution is modified by considering the vortex structure in the near-wall region. For verification purposes, multi-step simulation results for ice accretion of NACA0012 airfoil and large camber and strong separation airfoil under specified icing conditions are compared with the corresponding experimental data and some previously predicted results. The results of quantitative comparison of ice shape indicate that the current calculation method has better consistency with the experimental data, especially for glaze ice. The similarity of ice shape is more than 20% higher than the previous prediction results, showing that the time-space adaptive adjustment strategy has good robustness and accuracy for ice prediction.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501057
  • Bubble Complex Finite Strip Method in the Stability and Vibration Analysis
           of Orthotropic Laminated Composite Plates
    • Authors: Mohammad Sekhavatjou, Mojtaba Azhari, Saeid Sarrami-Foroushani
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      In this study, a bubble complex finite strip method (BCFSM) with the higher-order zigzag theory is formulated for mechanical buckling and free vibration analysis of laminated composite plates, including cross-ply and angle-ply laminates. Few studies have been done to obtain the analytical solutions for clamped and free boundary conditions in the longitudinal and transverse edges. Therefore, this study, for the first time, investigates the effects of various boundary conditions on the stability and vibration results of laminated composite plates subjected to axial or pure shear forces with the use of higher-order zigzag theory and BCFSM. Following this, both the interlaminar continuity conditions of transverse shear stresses and the shear-free surface conditions are satisfied by applying a cubic displacement and a zigzag linear varying displacement with the same number of unknowns as the first-order shear deformation theories. Moreover, the effects of width-to-thickness ratio, fiber orientation, number of modes, different dimensional ratios of the plate, and finally, the number of layers are investigated through numerical examples. The bubble shape functions are exploited in the transverse direction to improve the convergence of the method. Finally, the shearing and axial interaction diagrams of composite laminated plates are presented for various types of boundary conditions.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501069
  • Gradient Enhanced Localized Radial Basis Collocation Method for Inverse
           Analysis of Cauchy Problems
    • Authors: Judy P. Yang, Yuan-Chia Chen
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      This work proposes a gradient enhanced localized radial basis collocation method (GL-RBCM) for solving boundary value problems. In particular, the attention is paid to the solution of inverse Cauchy problems. It is known that the approximation by radial basis functions often leads to ill-conditioned systems due to the global nature. To this end, the reproducing kernel shape function and gradient reproducing kernel shape function are proposed to localize the radial basis function while the gradient approximation is aimed at reducing the computational intensity of carrying out the second derivatives of reproducing kernel shape function. In the proposed weighted collocation method, the weights on Neumann and Dirichlet boundary conditions are determined for both direct problems and inverse problems. From stability analysis, it is shown that the GL-RBCM can maintain high accuracy of approximating the first derivatives even under irregular perturbation added to boundary conditions. By comparing with the localized RBCM, the CPU saving of the GL-RBCM is manifested. The efficacy of the proposed method is therefore demonstrated.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501070
  • A Network Evolution Model for Recovery of the Mullins Effect in Filled
    • Authors: Hao Chu, Ji Lin, Dong Lei, Jin Qian, Rui Xiao
      Abstract: International Journal of Applied Mechanics, Ahead of Print.
      The stress-softening phenomenon, named as the Mullins effect, can widely occur in filled rubbers after cyclic loading and unloading conditions. The reloading curve is typically below the initial loading curve unless the applied strain exceeds the previously applied maximum strain. Experimental observations have also shown that the Mullins effect can be recovered by annealing the pre-deformed filled rubbers at a high temperature while the recovery level strongly depends on the annealing time and temperature. In this work, we develop a theoretical model to describe the recovery of the Mullins effect by incorporating the dynamic scission and recovery of polymer chains into the eight-chain model. Experiments have also been performed on two types of filled rubbers to validate the theory. The results show that the model is able to capture the main features of the experimental observations including the Mullins effect of virgin specimens and the recovery of the Mullins effect of pre-deformed specimens subjected to different annealed conditions.
      Citation: International Journal of Applied Mechanics
      PubDate: 2020-11-27T08:00:00Z
      DOI: 10.1142/S1758825120501082
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