Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)     - CERAMICS, GLASS AND POTTERY (31 journals)    - MACHINERY (34 journals)    - MANUFACTURING AND TECHNOLOGY (223 journals)    - METROLOGY AND STANDARDIZATION (6 journals)    - PACKAGING (19 journals)    - PAINTS AND PROTECTIVE COATINGS (4 journals)    - PLASTICS (42 journals)    - RUBBER (4 journals) MACHINERY (34 journals)
 Showing 1 - 27 of 27 Journals sorted alphabetically Acta Mechanica Solida Sinica       (Followers: 8) Advanced Energy Materials       (Followers: 31) Applied Mechanics Reviews       (Followers: 27) CORROSION       (Followers: 20) Electric Power Components and Systems       (Followers: 7) Foundations and Trends® in Electronic Design Automation       (Followers: 1) International Journal of Machine Tools and Manufacture       (Followers: 8) International Journal of Machining and Machinability of Materials       (Followers: 4) International Journal of Manufacturing Technology and Management       (Followers: 8) International Journal of Precision Technology       (Followers: 1) International Journal of Rapid Manufacturing       (Followers: 3) International Journal of Rotating Machinery       (Followers: 2) Journal of Machinery Manufacture and Reliability       (Followers: 2) Journal of Manufacturing and Materials Processing Journal of Mechanics       (Followers: 9) Journal of Strain Analysis for Engineering Design       (Followers: 5) Journal of Terramechanics       (Followers: 4) Machine Design       (Followers: 183) Machine Learning and Knowledge Extraction       (Followers: 12) Machines       (Followers: 4) Materials       (Followers: 4) Mechanics Based Design of Structures and Machines: An International Journal       (Followers: 8) Micromachines       (Followers: 2) Pump Industry Analyst       (Followers: 1) Russian Engineering Research Sensor Review       (Followers: 2) Surface Engineering and Applied Electrochemistry       (Followers: 6)
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 Acta Mechanica Solida SinicaJournal Prestige (SJR): 0.542 Citation Impact (citeScore): 1Number of Followers: 8      Hybrid journal (It can contain Open Access articles) ISSN (Print) 0894-9166 - ISSN (Online) 1860-2134 Published by Springer-Verlag  [2469 journals]
• Correction to: Structural Optimization of Fiber-Reinforced Material Based
on Moving Morphable Components (MMCs)

PubDate: 2022-05-09

• Effect of Interface Area on Nonlinear Magnetoelectric Resonance Response
of Layered Multiferroic Composite Ring

Abstract: Abstract Multiferroic composite structures are widely used in sensing, driving and communication. The study of their magnetoelectric (ME) behavior under various excitations is crucial. This study investigates the nonlinear ME influence of a multilayer composite ring structure consisting of Terfenol-D (TD) magnetostrictive and lead zirconate titanate (PZT) piezoelectric rings utilizing a multiphysics field modeling framework based on the fully coupled finite element method. The ME coupling coefficient of the PZT/TD concentric composite ring is predicted using the linear piezoelectric constitutive model and the nonlinear magnetostrictive constitutive model, which is congruent to the experimental data. The effect of the interface area of a trilayered structure on the coupling performance at the resonant frequency is investigated, considering the magnitude and frequency of the magnetic field and keeping the material ratio constant. The ME coupling coefficient of a trilayered structure is larger than that of a bilayered structure with the same material ratio, and the maximum ME coupling coefficient of a trilayered structure increases nonlinearly with the increase in the interface area. At the resonant frequency, the structure's ME coupling performance is considerably improved. An optimization technique based on structural geometric design and magnetic field control is presented to optimize the ME coupling coefficient.
PubDate: 2022-05-06

• Correction Factors of the Approximate Theories for Axisymmetric Modes of
Longitudinal Waves in Circular Rods

Abstract: Abstract The longitudinal waves guided by rods are widely used in broad engineering fields. Approximate theories are required to improve the understanding of the longitudinal wave propagation in finite rods in particular. The correction factors are commonly used in the vibration analyses of beams and plates, but are seldom adopted to the longitudinal wave propagation in rods in a similar manner. In this paper, the longitudinal and radial displacements in axisymmetric problems of circular rods are expanded in infinite power series of the radial coordinate. By using Hamilton’s principle, an infinite one-dimensional system of equations of motion is established. The high-order components of stress and strain, and their relations are introduced to obtain the infinite one-dimensional system for the axisymmetric wave propagation in elastic rods. A proper truncation of the infinite equations leads to an approximate theory of a specific order. To improve the truncated equations, some high-order components of strain are multiplied by the correction factors. The correction factors for the first- to fourth-order approximations are systematically determined to ensure that the cutoff frequencies are the same as the exact values calculated by the Pochhmammer–Chree equation. The frequency spectra, via the well-known Pochhmammer–Chree equation and the approximate theories of order one to four, are presented for comparison in a region where the longitudinal wave is not attenuating and the wavelength in the axial direction is longer than the diameter of the rod. Compared to the approximate theories without correction factors, the approximate theories with correction factors show some advantages in accuracy when the branches are high.
PubDate: 2022-05-06

• Aeroelastic Properties and Nonlinear Vibration Control of a
Simply-Supported Lattice Sandwich Beam Embedded with Nitinol-Steel Wire
Ropes

Abstract: Abstract As a novel vibration absorber, Nitinol-steel wire rope (NiTi-ST) has rarely been studied on vibration suppression for lattice sandwich beams in supersonic airflow. In this paper, NiTi-ST with nonlinear stiffness and hysteretic damping is embedded in a lattice sandwich beam to control the beam's vibration. The nonlinear restoring and hysteretic damping force of NiTi-ST are treated as polynomials. The dynamic equation is established based on Hamilton's principle. The amplitude responses of the beam with different NiTi-ST configurations are calculated. The vibration-suppression effects and energy dissipation of lattice sandwich beam with different NiTi-ST configurations under different air velocities are also compared. The frequency-domain and time-domain methods are used to analyze the structural aeroelastic properties. Simulation results show that the use of NiTi-ST can significantly suppress excessive vibration of a lattice sandwich beam in supersonic airflow.
PubDate: 2022-04-29

• Estimation of Fracture Toughness for A508-III Steel in Ductile-to-Brittle
Transition Region Using a Strain-Energy–Density-Based Fracture Failure
Model

Abstract: Abstract According to the assumption of intrinsic relationship between ultimate strain energy density and microcrack nucleation, this work developed a fracture failure model to estimate the fracture toughness of A508-III steel in the ductile-to-brittle transition region. The fracture toughness and uniaxial tension tests at different temperatures were carried out to determine the relationship between nucleation parameter and ultimate strain energy density, from which the evolutions of fracture toughness of A508-III ferritic steel for different cumulative failure probabilities at different temperatures were predicted. The fracture failure model can well describe the fracture toughness distribution of A508-III steel in the ductile-to-brittle transition region. Compared with the master curve method, this model has better temperature adaptability. It is more convenient to calibrate the parameters of this model compared with the traditional Beremin model, and without complex finite element analysis.
PubDate: 2022-04-27

• Theoretical Analysis of Crack Propagation Measurement for Brittle
Materials Based on Virtual Principal Strain Field

Abstract: Abstract The measurement of crack propagation is crucial for revealing the fracture mechanical properties of materials and structures. Based on the virtual principal strain field and Steger’s algorithm, an accurate and automatic method has been proposed for measuring the geometric parameters of crack propagation. The measured geometric parameters of crack propagation include the width, length, and tip location of each crack. The mechanism of the crack-induced virtual principal strain field and the effects of subset, step, and strain window size are analyzed and discussed theoretically. The effectiveness of the derived theoretical equations is verified by the simulation experiments. According to the theoretical equations, it is determined that the distribution of the virtual principal strain field near the crack is similar to the grayscale distribution of the laser fringe image with optimized calculation parameters. Experiments are further conducted to validate the effectiveness of the derived equations. With the optimized calculation parameters, the minimum crack that can be measured is approximately 0.0362 pixel in the laboratory environment, while the measurement error of the crack width is less than 0.025 pixel for two-dimensional digital image correlation (DIC) and 0.020 pixel for three-dimensional DIC.
PubDate: 2022-04-21

• Effective Energy Density of Glass Rejuvenation

Abstract: Abstract Glasses with rejuvenated structures usually exhibit improved room-temperature plasticity, which facilitates their applications. However, glass rejuvenation requires external energy injection to “shake up” the frozen-in disordered structure. In this work, we give the answer to how much the required energy is. According to the constitutive model of amorphous plasticity, we find that the applied stress higher than the steady-state flow value can effectively induce the structural disordering in terms of the generation of free volume. Therefore, the effective energy density (EED) of structural rejuvenation is defined as the integral of this effective stress on the corresponding strain. By tailoring the applied strain, strain rate, temperature and initial free volume, different degrees of structural rejuvenation are achieved, which show a generally linear correlation with the defined EED. This work deepens the understanding of glass rejuvenation from an energy perspective.
PubDate: 2022-04-14

• Mechanics and Wave Propagation Characterization of Chiral S-Shaped Auxetic
Metastructure

Abstract: Abstract Auxetic metastructures have attracted tremendous attention because of their robust multifunctional properties and promising potential industrial applications. This paper studies the in-plane mechanical behaviors of a chiral S-shaped metastructure subjected to tensile loading in both X-direction and Y-direction and wave propagation properties using the finite element (FE) method. The relationships between structural parameters and elastic behaviors are also discussed. The results indicate that the orientation of chiral S-shaped metastructure under tensile loading in the X-direction exhibits higher auxeticity and stiffness. Then, the band structures and the edge modes of each band gap of the chiral S-shaped metastructure are explored, and the relations between band gap properties and structural parameters are also systematically analyzed. Moreover, we explore the wave mitigation of the chiral S-shaped metastructures by regulating the structural parameters. Finally, the transmission properties of the finite chiral S-shaped periodic metastructures are studied to confirm the results of band gap simulation. This study promotes the engineering application of vibration isolation of chiral structures based on the band gap theory.
PubDate: 2022-04-13

• A Microstructural Damage Model toward Simulating the Mullins Effect in
Double-Network Hydrogels

Abstract: Abstract The damage models based on the eight-chain model and the affine full-chain network model are not adequate to describe the damage behaviors in double-network (DN) hydrogels. To overcome this limitation, we propose a combined chain stretch model with new damage flow rules. It is demonstrated that the new proposed micro-chain stretch is a reduced form of the complete representation for the transversely isotropic tensor function. As a result, the damage models based on the eight-chain model and the affine model are incorporated as special cases. The effects of chain affineness and network entangling are simultaneously involved in the new model, while only one of these two effects can be characterized in either the eight-chain model or the affine model. It is further shown that the new model can effectively capture the Mullins features of the DN hydrogels and achieve better agreement with the experimental data than the affine model and the eight-chain model.
PubDate: 2022-04-12

• A Transversely Isotropic Magneto-Electro-Elastic Circular Kirchhoff Plate
Model Incorporating Microstructure Effect

Abstract: Abstract A non-classical model for transversely isotropic magneto-electro-elastic circular Kirchhoff plates is established based on the extended modified couple stress theory. The Gibbs-type variational principle is used to obtain the governing equations and boundary conditions. To illustrate the newly derived model, the static bending problem of a clamped circular plate subjected to a uniformly distributed constant load is solved numerically by Fourier–Bessel series. The numerical results show that the values of transverse displacement, electric and magnetic potentials predicted by the current model are always smaller than those of the classical model, and the differences are diminishing as the plate thickness increases. In addition, it is shown that the magneto-electro-elastic coupling effect plays an important role in the transverse displacement, electric potential and magnetic potential of the magneto-electro-elastic circular Kirchhoff plates. Furthermore, several reduced specific models are provided for simpler cases.
PubDate: 2022-04-01

Pressure Bar Experiments

PubDate: 2022-04-01

• Closed-Form Solutions of Stress Intensity Factors for Semi-elliptical
Surface Cracks in a Cylindrical Bar Under Pure Tension

Abstract: Abstract In this work, the stress intensity factors (SIFs) for a wide range of semi-elliptical surface cracks with different inclination angles in a cylindrical bar subjected to pure tension were investigated numerically. The main parameters considered to evaluate the SIFs were the crack size ratio $$(a\big / d)$$ , the crack aspect ratio $$(a\big /c)$$ , and the crack inclination angle $$(\theta )$$ . The dual-boundary element method implemented in software BEASY was used to compute the SIF values for cracks. Furthermore, the general closed-form solutions were proposed to evaluate the corresponding SIFs for Mode I, Mode II and Mode III types of fracture through curve fitting approaches. These solutions can provide accurate and reliable values of stress intensity factors for a crack on a cylindrical bar under pure tension in a rapid way compared to those obtained using computational models. In addition, these results can be used as inputs for failure studies and life evaluations of cracked cylinder under working conditions.
PubDate: 2022-04-01

• Extraction on the Contact Forces Among the Opaque and Non-photoelastic
Particles Under Electromagnetic Force

Abstract: Abstract Contact force is related to the mechanical response of superconducting strands under a large electromagnetic body force, which is important for the safety of the international thermonuclear experimental reactor (ITER) magnet structure. Due to the complex structure of the cable-in-conduit conductor (CICC), the component unit of the ITER magnet, and the extreme operating environment, the research on the strand contact force caused by the electromagnetic force has been progressing slowly. In this study, a two-dimensional (2D) theoretical model based on the granular element method is constructed to compute the contact forces among some opaque and non-photoelastic ferromagnetic particles which are placed in a non-uniform magnetic field. In the experiment, the contact deformations of these particles may be obtained by the digital image correlation method. We also propose a method, which is similar to the least-squares method, to calculate the electromagnetic body forces of different particles. Subsequently, the distributional and statistical characteristics of the contact force chains and contact angles are presented. It is considered that the method proposed in this paper is suitable for the contact force analysis of the cross section of superconducting strands in the ITER CICC that is subjected to a transverse electromagnetic force. In the end, this 2D theoretical model is generalized to the three-dimensional (3D) case, and the concise mathematical framework is presented.
PubDate: 2022-04-01

• Analysis for Multiple Cracks in 2D Piezoelectric Bimaterial Using the
Singular Integral Equation Method

Abstract: Abstract A singular integral equation method is proposed to analyze the two-dimensional (2D) multiple cracks in anisotropic piezoelectric bimaterial. Using the Somigliana formula, a set of singular integral equations for the multiple crack problems are derived, in which the unknown functions are the derivatives of the generalized displacement discontinuities of the crack surfaces. Then, the exact analytical solution of the extended singular stresses and extended stress intensity factors near the crack tip is obtained. Singular integrals of the singular integral equations are computed by the Gauss–Chebyshev collocation method. Finally, numerical solutions of the extended stress intensity factors of some examples are presented and discussed.
PubDate: 2022-04-01

• Photo-Activated Snap-Through of Nematic Shallow Spherical Shells

Abstract: Abstract Photo-responsive nematic polymers can transduce light into mechanical work, but the rate is limited by the quasi-static deformation. To enhance the work output, a strategy of exploiting photo-triggered snap-through of glassy nematic shallow spherical shells with hemeotropic director alignment is examined here. The criterion for the nonlinear instability is derived analytically by using the modified iteration method. It is shown that, for thin shells of small height and large basal radius, snap-through can be caused by an incident light with moderate irradiation intensity. The phenomenon may inspire some new designs of contactless and ultra-fast actuation devices with high-rate output of mechanical work.
PubDate: 2022-04-01

• Dynamic Impact of High-Density Aluminum Foam

Abstract: Abstract High-density aluminum foam can provide higher stiffness and absorb more energy during the impact Obtaining the constitutive law of such foam requires tri-axial tests with very high pressure, where difficulty may arise because the hydrostatic pressure can reach more than 30 MPa. In this paper, instead of using tri-axial tests, we proposed three easier tests—tension, compression and shear to obtain the parameters of constitutive model (the Deshpande–Fleck model). To verify the constitutive model both statically and dynamically, we carried out additional triaxial tests and direct impact tests, respectively. Based on the derived model, we performed finite element simulation to study the impact response of the present foam. By dimensional analysis, we proposed an empirical equation for a non-dimensional impact time   $${\bar{t}}_{\mathrm {d}}$$ , the impact time divided by the time required for plastic wave travelling from the impact surface to the bottom surface, to determine the deformation characteristic of the aluminum foam after impact. For the case with $${\bar{t}}_{\mathrm {d}}\le 1$$ , the deformation tends to exhibit a shock-type characteristic, while for the case with $${\bar{t}}_{\mathrm {d}}>5$$ , the deformation tends to exhibit an upsetting-type characteristic.
PubDate: 2022-04-01

• Frequency Veering of Rotating Metal Porous Twisted Plate with Cantilever
Boundary Using Shell Theory

Abstract: Abstract The frequency veering of a metal porous rotating cantilever twisted plate with twist angle and stagger angle is investigated. Metal porous materials may have the characteristics of gradient or uniform distribution along the thickness direction. Based on the classical shell theory, considering the influence of centrifugal force produced by high-speed rotation, the free vibration equations of a rotating cantilever twisted plate are derived. Through the polynomial function and Rayleigh–Ritz method, the natural frequencies and mode shapes of the metal porous cantilever twisted plate in both static and rotating states are derived. The accuracy of the present theory and calculation results is confirmed by a comparison between them and the results available from the literature and those obtained from Abaqus. The influences of the thickness ratio, porosity, twist angle, stagger angle and rotational velocity on the frequency veering and mode shape shift of the rotating cantilever twisted plate with porous material under three different distributions are analyzed. It should be mentioned that the frequency veering accompanied by mode shape shift occurs in both static and dynamic states.
PubDate: 2022-04-01

• A Macro-Mechanical Study for Capturing the Dynamic Behaviors of a
Rate-Dependent Elastomer and Clarifying the Energy Dissipation Mechanisms
at Various Strain Rates

Abstract: Abstract A strain-rate-sensitive polyurethane elastomer is numerically investigated to reveal improved impact characteristics and analyze the concerned rate dependencies and dynamic energy dissipation features. A physical constitutive model in view of amorphous molecular structure of the elastomer is proposed by relating the macro-mechanical behaviors to micro-structural changes through molecular transitions and flow activations. Two distinct relaxation processes are considered because of entangled molecular networks, with each possessing a unique activation energy. Through calibration with experimental data, finite element simulations based on the model are conducted. Related to the loading rate, the structural entropy of molecular chain entanglements, rate-dependent yielding, plateau flow and densification are well predicted by the model. The investigations are extended further regarding the material recoverability and accordingly, strain energy absorptions are illustrated. A power law function is proposed for designing the energy absorption relation to the applied loading rate. Finally, the inherent mechanisms causing the dynamic energy absorptions are analyzed with notable clarifications of post-experimental observations obtained via scanning electron microscopy.
PubDate: 2022-04-01

• Design and Wave Propagation Characterization of Starchiral Metamaterials

Abstract: Abstract Metamaterials with simple artificial topological properties made from industrially produced single-phase materials have extraordinary innovation and challenge. In this paper, we investigated wave propagation characteristics of a hexastarchiral lattice metamaterial with periodic assemblies and used the finite element (FE) method to study the band gap properties. Then, in order to understand the mechanism of band gaps, we discussed the mode shapes of unit cells and found that the bending of the ligament and the overall rotation have a high correlation with the generation of omnidirectional band gaps. The relationships between geometric parameters and band gap properties have also been systematically studied, which demonstrated that the band gaps of the proposed metamaterial could be reasonably predicted through the evolution of geometric parameters. Finally, the transmission characteristics of finite sandwich panel structures composed of periodic unit cells were calculated to verify the correctness of the band gap simulation results, which proved that the proposed artificial metastructure has potential application value in vibration and noise reduction projects.
PubDate: 2022-04-01

• The Improved Interpolating Complex Variable Element-Free Galerkin Method
for Two-Dimensional Elastic Problems

Abstract: Abstract An improved interpolating complex variable element-frees Galerkin (IICVEFG) method for the two-dimensional elastic problems is developed. This method is based on the improved interpolating complex variable moving least-squares (IICVMLS) method and the integral form of the elastic problems. In the IICVEFG method, the proposed shape function has the interpolating feature. Therefore, the essential boundary conditions can be exerted directly. Additionally, the unnecessary terms in the discrete matrices are removed, which results in a set of concise formulas. This method is verified by analyzing three elastic examples under different constraints and loads. The numerical results show that the IICVEFG method is superior in precision and efficiency to other non-interpolating meshless methods.
PubDate: 2022-02-14
DOI: 10.1007/s10338-021-00258-4

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