Article
Mechanics
Suranjit Kumar, M. K. Samal, P. K. Singh, J. Chattopadhyay
Summary: This paper presents a yield function for porous metallic materials that accounts for diffused and localized plasticity modes, capturing the competition between these modes as a function of void shape. The proposed model has been extensively validated for a wide range of ellipsoidal void geometries, accurately predicting the effect of shear localization on the yield surface.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Leo Morin, Djimedo Kondo
Summary: The paper aims to develop a size-dependent Gurson type model by considering different mechanisms responsible for size effects at various scales. The model describes hardening heterogeneity by introducing strain gradient effects and shows good agreement with numerical data in predicting stress triaxiality.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Mechanics
Pouya Tajdary, Leo Morin, Liliana Romero-Resendiz, Maysam B. Gorji, Chedly Braham, Gonzalo Gonzalez
Summary: The aim of this work is to investigate and predict ductile failure in forming processes. Experimental results suggest that failure can be due to shear-dominated loadings. The micromechanical Madou-Leblond model is used to simulate numerically failure during forming, which can account for void shape effects under shear loadings. The model accurately reproduces failure and crack shape in different processing conditions. Comparisons with the GTN model highlight the importance of void shape effects upon failure.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Yi Shen, Tianbao Ma, Jianqiao Li
Summary: Metal fracture under different stress states is a significant problem in engineering. This paper proposes a new damage evolution model based on void evolution, which is validated through quasi-static tensile tests and numerical simulation. The effects of specimen shapes on damage and void evolution are also investigated.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Haoxu Ding, Tao Zhu, Xiaorui Wang, Bing Yang, Shoune Xiao, Guangwu Yang
Summary: Based on the mechanism of void nucleation, growth, and coalescence, this study established an uncoupled isotropic ductile fracture model that considered void shape change and void coalescence through internal necking. The flexibility and effectiveness of the proposed model were verified through parameter studies and comparison with experimental results. The new model showed superior precision compared to other widely used models.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Mechanical
Chao Ling, Dong-Feng Li, Esteban P. Busso
Summary: The use of a neural network surrogate model for predicting the behavior of single crystals with voids under creep loadings was investigated. The model was found to accurately predict the deformation behavior and porosity evolution of porous single crystals within the interpolation range, with good extrapolation ability for stress triaxiality lower than 1/3.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Construction & Building Technology
Fengrui Rao, Longwen Tang, Yuhai Li, Guanbao Ye, Christian Hoover, Zhen Zhang, Mathieu Bauchy
Summary: In this study, a novel analytical model is proposed to describe the fracture behavior of porous materials under uniaxial tension. This model utilizes parallel elastic and plastic elements to characterize the nonlinear stress-strain curve of porous phases. Furthermore, a stochastic damage model is developed to describe the propagation of randomly scattered voids or microflaws, allowing for the identification of key influential factors in the failure of porous materials.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
J. Makkar, T. Baxevanis
Summary: The study analyzes the fracture mechanisms in Shape Memory Alloys (SMAs) and highlights their differences from other intermetallics in terms of crystallographic structure transformation and the presence of precipitates in large volume fractions. Numerical simulations show that void growth plays a limited role in the stress-strain response of the unit cell for precipitation-hardened SMAs, suggesting a minor contribution to dimple formation compared to void nucleation and cleavage.
MECHANICS OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Boyuan Zhang, Haoyang Xu, Yumin Xia, Jin Wen, Meifang Zhu
Summary: Thermally activated delayed fluorescence (TADF) molecules have potential applications in organic light-emitting diodes (OLED) due to their high photoluminescence quantum yield. However, the narrow energy gap between frontier molecular orbitals in TADF molecules with donor-acceptor structures poses a challenge for blue OLED. This study investigates the feasibility of a void-carbon strategy to improve TADF performance and provides insights for the design of blue-emission TADF molecules.
FRONTIERS IN CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
A. S. Bhuwal, T. Liu, I. Ashcroft, W. Sun
Summary: This study investigates the effect of stress triaxiality on the failure mechanisms of an-isotropic perfect and imperfect planar FCC truss lattice metamaterials. Different types and levels of defects can lead to various modes of microscopic localization before failure, such as crushing band, shear band, and void coalescence. Distorted lattices are more prone to shear band localization, while missing lattices tend to fail due to void coalescence at high missing struts defect levels.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
Sagi Chen
Summary: This paper examines the mechanical fields in the surroundings of a void under shear as a realization of the mechanical behavior of a ligament between coalescing voids. The presence of secondary voids is shown to reduce the average triaxiality in the cell and homogenize its distribution, indicating a mechanical advantage. The effect of extra secondary voids on the mechanical fields is examined and correlated to their size and location with respect to the existing primary void.
MECHANICS RESEARCH COMMUNICATIONS
(2022)
Article
Mechanics
Nicola Bonora, Gabriel Testa
Summary: The model aims to reconcile the theoretical framework of continuum damage mechanics with specific mechanisms of ductile fracture, establishing correlations between void evolution and continuum scale physical quantities through micromechanical modeling. It also allows the derivation of the fracture locus for the whole range of stress triaxiality and reformulates unilateral conditions for ductile damage.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Nicola Bonora, Gabriel Testa
Summary: The plasticity damage self-consistent (PDSC) model is a damage model developed within the framework of continuum damage mechanics, which can predict ductile failure response by considering the synergic action of different micro mechanisms contributing to ductile fracture.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Kazutake Komori
Summary: In the fracture forming limit diagram, it is observed that the major strain at fracture increases as the minor strain at fracture increases in sheet shear testing. This study predicts ductile fracture during extended Miyauchi shear testing using an analytical model. The effects of prestrain on ductile fracture and the comparison between experimental and analytical results are investigated.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Chemistry, Multidisciplinary
Shiqi Yang, Zhiqiang Gao, Pengfei Qiu, Jiasheng Liang, Tian-Ran Wei, Tingting Deng, Jie Xiao, Xun Shi, Lidong Chen
Summary: A new ductile inorganic TE material, Ag20S7Te3, with high TE performance, has been reported in this study, showing better ductility and shape-conformability than Ag2S. The high carrier mobility and low lattice thermal conductivity of Ag20S7Te3 result in a maximum figure of merit of 0.80 at 600 K. This study paves the way for the development of hetero-shaped TEG.
ADVANCED MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
M. Ezequiel, I. A. Figueroa, S. Elizalde, J. M. Cabrera, C. Braham, L. Morin, G. Gonzalez
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2020)
Article
Materials Science, Multidisciplinary
Khaoula Dorhmi, Leo Morin, Katell Derrien, Zehoua Hadjem-Hamouche, Jean-Pierre Chevalier
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2020)
Article
Engineering, Multidisciplinary
Leo Morin, Renald Brenner, Katell Derrien, Khaoula Dorhmi
Summary: This paper develops a periodic smoother based on splines for FFT-based solvers, addressing spurious oscillations caused by pseudo-spectral differentiation of discontinuous fields. The automatic smoother improves local fields significantly and reduces spurious oscillations in various problems including conductivity, elasticity, and field dislocation mechanics.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
Khaoula Dorhmi, Katell Derrien, Zehoua Hadjem-Hamouche, Leo Morin, Frederic Bonnet, Jean-Pierre Chevalier
Summary: This study investigates the effective properties of Fe-TiB2 composites obtained after hot or cold rolling, measuring the elastic moduli experimentally and using various methods. Microstructure analyses based on SEM observations are conducted to characterize particle and cracks distribution, and 3D representative microstructures are generated using the RSA method. The overall elastic behavior of the composites is determined numerically through full-field FFT-based simulations, showing a significant improvement in specific stiffness compared to standard steels regardless of processing conditions.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Leo Morin, Chedly Braham, Pouya Tajdary, Raoudha Seddik, Gonzalo Gonzalez
Summary: This paper aims to provide spatially resolved distributions of residual stresses using X-ray diffraction measurements and a spatial deconvolution technique. The method is first applied to reconstruct residual stresses in two reference cases with strong agreement between the reference stress profiles and the reconstructed ones. Experimental X-ray diffraction measurements also show a good agreement between the local stress profile reconstructed from the measurements and that predicted numerically.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Manufacturing
Pouya Tajdary, Leo Morin, Chedly Braham, Gonzalo Gonzalez
Summary: This study developed a reduced single-pattern model for the multi-pattern metal forming process RCS, which is able to accurately represent the stabilized behavior of the multi-pattern model. The analysis revealed that a single-pattern model with symmetric-periodic boundary conditions during unloading is the best choice for reproducing the stress and strain behavior of the stabilized sections of the multi-pattern model.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Engineering, Multidisciplinary
Leo Morin, Amit Acharya
Summary: This study develops a computational model for arbitrary brittle crack propagation within a fault-like layer in a 3D elastic domain, and analyzes its associated quasi-static and dynamic fields. The model utilizes FFT-based solver for linear momentum balance and a Godunov-type projection-evolution method for crack evolution equation. Applications of the model include exploring equilibria, irreversibility, strength and toughness criteria, and crack propagation under different loading conditions.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2021)
Article
Mechanics
R. Seddik, A. Rondepierre, S. Prabhakaran, L. Morin, V Favier, T. Palin-Luc, L. Berthe
Summary: A method combining experiments and simulations has been developed to characterize the yield stress and strain hardening of several metals, including pure aluminum, aluminum alloys, and titanium alloy during Laser Shock Peening. The experiments were simulated using three material constitutive equations to identify the material parameters of the Johnson-Cook law by comparing experimental and calculated velocity profiles of the rear-free surface. Results are presented and discussed.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Materials Science, Multidisciplinary
P. Tajdary, L. Morin, C. Braham, G. Gonzalez
Summary: This paper develops a reconstruction method to map heterogeneous residual stresses from X-ray diffraction averaged measurements. The method is based on the deconvolution of average XRD measurements and involves a fine measurement grid and the use of two collimators to obtain accurate local stress field values.
EXPERIMENTAL MECHANICS
(2022)
Article
Mechanics
L. Lapostolle, K. Derrien, L. Morin, L. Berthe, O. Castelnau
Summary: This paper studies the effect of microstructure heterogeneity on the propagation of elasto-plastic waves during laser shot peening. The experiment found that even a small mechanical contrast between the phases has a significant effect on the distribution of plastic strain. In addition, an elasto-plastic homogenization method has been used to reduce the computation time of wave propagation.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Mechanics
Pouya Tajdary, Leo Morin, Liliana Romero-Resendiz, Maysam B. Gorji, Chedly Braham, Gonzalo Gonzalez
Summary: The aim of this work is to investigate and predict ductile failure in forming processes. Experimental results suggest that failure can be due to shear-dominated loadings. The micromechanical Madou-Leblond model is used to simulate numerically failure during forming, which can account for void shape effects under shear loadings. The model accurately reproduces failure and crack shape in different processing conditions. Comparisons with the GTN model highlight the importance of void shape effects upon failure.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Joseph Paux, Leo Morin, Renald Brenner
Summary: This paper proposes a method of using discontinuous velocity fields based on FFT numerical results to analyze the strain localization problem of periodic distributions of voids in single crystals. The experimental results show that this new method can provide a good estimation of the macroscopic yield stress.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2022)
Article
Mechanics
L. Lapostolle, L. Morin, K. Derrien, L. Berthe, O. Castelnau
Summary: The aim of this study is to develop a model for fast approximation of elastic-plastic stress wave propagation and residual stress field caused by laser impact. The stress wave propagation is modeled using a 1D uniaxial model, excluding edge effects. The plastic strain field is then used to compute residual stresses using an analytic model. The accuracy of the 1D model is assessed by comparing it to finite element simulations, showing a good match for laser spot diameters larger than 2 mm.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
L. Lapostolle, L. Morin, K. Derrien, L. Berthe, O. Castelnau
Summary: We investigate the influence of material microstructure on plastic strain and residual stress fields in elasto-plastic shockwaves induced by high power laser impacts in 2D polycrystalline metallic alloys. Simulations on single crystal specimens with different lattice orientations show that plastic strain is concentrated in narrow bands at the edges of the laser impact and parallel to the slip planes. For polycrystalline microstructures composed of randomly oriented grains, the random morphology results in a heterogeneous distribution of residual plastic strain and stress fields, which deviates from the commonly modeled residual stress fields. Statistical analysis of mechanical fields over a large number of microstructures reveals that localized concentrations of less compressive or tensile residual stresses at the surface may reduce the fatigue resistance of the shocked material.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2023)
Article
Materials Science, Multidisciplinary
Leo Morin, Djimedo Kondo
Summary: The paper aims to develop a size-dependent Gurson type model by considering different mechanisms responsible for size effects at various scales. The model describes hardening heterogeneity by introducing strain gradient effects and shows good agreement with numerical data in predicting stress triaxiality.
INTERNATIONAL JOURNAL OF FRACTURE
(2021)
Article
Materials Science, Multidisciplinary
Yanzheng Wang, Qian Wu, Yiran Tian, Guoliang Huang
Summary: This paper proposes the microstructure design of an odd plate and investigates the directional wave energy amplification and the presence of interface waves in odd plates through theoretical and numerical analysis. The research findings contribute to the understanding of elastic behavior in 2D non-Hermitian systems.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
F. Greco, D. Codony, H. Mohammadi, S. Fernandez-Mendez, I. Arias
Summary: This study overcomes the difficulty of harnessing the flexoelectric effect by designing multiscale metamaterials. Through topology optimization calculations, we obtain optimal structures for various apparent piezoelectric properties and find that low-area-fraction lattices are the preferred choice. The results show competitive estimations of apparent piezoelectricity compared to reference materials such as quartz and PZT ceramics.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xiaoxuan Zhang, Tryaksh Gupta, Zhenlin Wang, Amalie Trewartha, Abraham Anapolsky, Krishna Garikipati
Summary: This study presents a computational framework for coupled electro-chemo-(nonlinear) mechanics at the particle scale in solid-state batteries, including interfacial fracture, degradation in charge transfer, and stress-dependent kinetics. The discontinuous finite element method allows for arbitrary particle shapes and geometries.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Chengguan Zhang, Xavier Balandraud, Yongjun He
Summary: The coexistence of both austenite and martensite is a common characteristic in Shape Memory Alloys (SMAs). The multiple-domain microstructures, consisting of austenite, martensite twins, and individual martensite variants, evolve collectively during the phase transformation, affecting the material's macroscopic response. This paper presents an experimentally observed interface consisting of five domains in a Ni-Mn-Ga single-crystal, and analyzes the effects of thermal loading path and material initial state on the domain pattern formation.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Shaobao Liu, Haiqian Yang, Guang-Kui Xu, Jingbo Wu, Ru Tao, Meng Wang, Rongyan He, Yulong Han, Guy M. Genin, Tian Jian Lu, Feng Xu
Summary: The balance between stress and adhesion plays a crucial role in governing the behaviors of adherent cells, such as cell migration. In certain microenvironments, such as tumor, variations in hydrostatic pressure can significantly impact cell volume and adhesion, which in turn affects cell behavior.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Xun Xiong, Qinglei Zeng, Yonghuan Wang, Ying Li
Summary: In this work, the authors investigate the possibility of enhancing the resistance to crack growth in brittle materials through microstructure design. They establish a computational framework to simulate crack propagation and characterize fracture energy. The effects of different types of voids on toughening mechanisms are explored, and the critical conditions for embrittlement-toughening transition are identified. The study also discusses the difference between void toughening in brittle and ductile materials, and extends the toughening strategy to nacre-like materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Huan Wang, Yong-Quan Liu, Jiu-Tao Hang, Guang-Kui Xu, Xi-Qiao Feng
Summary: This study establishes a cytoarchitectural model to accurately capture the buckling and postbuckling behaviors of epithelia under fast compression. The stress evolution of epithelia is divided into three stages: loading, phase transition, and stress recovery. The postbuckling process is governed by the active tension generated by the actomyosin network. The study also proposes a minimal model that predicts the flattening time and stress recovery extent as functions of applied strain or strain rate, in agreement with simulations and experiments.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Lei Liu, Hao Liu, Yuming He, Dabiao Liu
Summary: This study investigates the mechanics and topologically complex morphologies of twisted rubber filaments using a combination of experiment and finite strain theory. A finite strain theory for hyperelastic filaments under combined tension, bending, and torsion has been established, and an experimental and theoretical morphological phase diagram has been constructed. The results accurately determine the configuration and critical points of phase transitions, and the theoretical predictions agree closely with the measurements.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Abhishek Painuly, Kunnath Ranjith, Avinash Gupta
Summary: This paper analyzes the interfacial waves caused by frictional slipping and studies their dispersion relation and wave modes. By studying the slip waves in a geophysical model, the surface wave dispersion phenomenon is explored, and an alternative explanation is proposed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Houlin Xu, Joshua Vievering, Hoang T. Nguyen, Yupeng Zhang, Jia-Liang Le, Zdenek P. Bazant
Summary: Motivated by the extraordinary strength of nacre, this study investigated the probabilistic distribution of fishnet strength using Monte Carlo simulations and found that previous analytical solutions are not applicable for fishnets with a large number of links. By approximating large-scale fishnets as a continuum with cracks or holes, the study revealed that the strength distribution follows the Weibull distribution. This new model has significance for optimizing the strength-weight ratio in printed material structures.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Souhayl Sadik, Arash Yavari
Summary: This paper revisits the mathematical foundations of nonlinear viscoelasticity and studies the geometry of viscoelastic deformations. It discusses the decomposition of the deformation gradient into elastic and viscous distortions and concludes that the viscous distortion can only be a two-point tensor. The governing equations of nonlinear viscoelasticity are derived and the constitutive and kinetic equations for various types of viscoelastic solids are discussed.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Wen Cheng, Hongkuan Zhang, Yu Wei, Kun Wang, Gengkai Hu
Summary: In this study, we propose a phenomenon similar to Thouless pumping for a continuous in-plane elastic system, enabling topological transport of elastic waves through spatial modulation of material elasticity. By incorporating specific lattice microstructures, termed pentamode materials, precise and robust control over elastic wave propagation is achieved.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)
Article
Materials Science, Multidisciplinary
Linda Werneck, Mertcan Han, Erdost Yildiz, Marc-Andre Keip, Metin Sitti, Michael Ortiz
Summary: We have developed a simple model that describes the ionic current through neuronal membranes by considering the membrane potential and extracellular ion concentration. The model combines a simplified Poisson-Nernst-Planck model of ion transport through individual ion channels with channel activation functions calibrated from experimental data. The calibrated model accounts for the transport of calcium, sodium, potassium, and chloride and shows remarkable agreement with experimentally measured current-voltage curves for human neural cells.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2024)