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
Materials Science, Multidisciplinary
Prakash H. Khavasad, Shyam M. Keralavarma
Summary: The paper investigates the growth of sub-grain voids in crystalline materials, proposing an effective yield criterion for porous single crystals. The effective yield criterion is derived through plastic limit load analysis of representative volume elements, and the model predictions are validated through comparison with numerical and analytical results.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
Prakash H. Khavasad, Shyam M. Keralavarma
Summary: In this study, a micromechanics-based yield criterion for a porous single crystal is derived using homogenization and limit analysis. The criterion takes into account the effect of plastic anisotropy and void size on yielding, and is validated against rigorous upper bound yield loci. The criterion has significant implications for studying the mechanical properties of porous materials.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Matti Lindroos, Napat Vajragupta, Janne Heikinheimo, Diogo Ribeiro Costa, Abhishek Biswas, Tom Andersson, Paer Olsson
Summary: A crystal plasticity model is proposed for modelling the mechanical behavior of polycrystalline UO2. The model includes a dislocation-density-based formulation with three slip families and their interactions. It is parametrized using single crystal and polycrystal experimental data and evaluated for yield point, strain hardening behavior, temperature and strain rate dependencies. The effect of porosity on homogenized macroscopic stress-strain behavior and stress/strain localization at the grain level is analyzed.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hojun Lim, Philip J. Noell, Jay D. Carroll
Summary: The study investigated the fracture behavior of tantalum single crystals with different tensile axes orientations and found that crystal orientation can affect the deformation and fracture characteristics of the material. Both experiments and simulations demonstrated that different crystal orientations result in varying deformation modes and failure mechanisms.
SCRIPTA MATERIALIA
(2021)
Article
Engineering, Mechanical
C. A. Bronkhorst, H. Cho, P. W. Marcy, S. A. Vander Wiel, S. Gupta, D. Versino, V. Anghel, G. T. Gray
Summary: Accurately representing porosity-based ductile damage in polycrystalline metallic materials remains a significant challenge, but a soft-coupled linkage technique between a macro-scale damage model and micro-mechanical calculations has shown promise in this study. The micro mechanical model captures non-Schmid effects and suggests significant influences on local stress conditions across grain boundaries and triple junctions within the polycrystalline network.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Mechanical
R. Bensaada, T. Kanit, A. Imad, M. Almansba, A. Saouab
Summary: This study models the effective mechanical response of highly porous materials using computational homogenisation, with a focus on a von Mises elastic-plastic matrix with spherical identical voids. The study investigates a wide range of void volume fractions and proposes an improvement to the GTN model to make it more suitable for various porous materials.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Wen Jiang, Piao Li, Wei-Xing Yao, Shao-Shi Rui, Hui-Ji Shi, Jie Huang
Summary: In this study, the high-cycle fatigue (HCF) lives and fatigue limits of nickel-based single crystal superalloys (NBSX) with different porosity sizes were investigated. It was found that the critical pore size plays a crucial role in determining the HCF properties. Additionally, the initiation of secondary cracks from the oxide layer was observed, which further weakens the HCF properties. A life prediction model based on the critical plane parameter and oxidation kinetic equation was proposed to evaluate the effect of porosity size and oxidation on the HCF life of NBSX. Furthermore, a fatigue limit evaluation model combining the life prediction model and Murakami model was presented. The accuracy and effectiveness of the models were verified through comparison with test results. Lastly, the defect-tolerance analysis using the Kitagawa-Takahashi diagram provided valuable insights for anti-fatigue design of NBSX.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Jean-Michel Scherer, Jacques Besson, Samuel Forest, Jeremy Hure, Benoit Tanguy
Summary: A new strain gradient void-driven ductile fracture model for single crystals is proposed and applied to simulate crack propagation in single and oligo-crystal specimens, taking into account the significant influence of plastic anisotropy on crack path, ductility, and fracture toughness.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Chemistry, Multidisciplinary
Wenting Li, Kui Xie
Summary: Researchers fabricated nanoporous single-crystalline oxide monoliths as catalysts for the preferential oxidation of CO in H-2 fuel. This technology achieved efficient CO removal across a wide temperature range and demonstrated stable power output for over 400 hours.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Engineering, Mechanical
Christos Skamniotis, Nicolo Grilli, Alan C. F. Cocks
Summary: We developed a crystal plasticity finite element framework to analyze slip localization and fatigue-creep behavior at cooling holes of single crystal Nickel based components. The slip rate consists of a thermally activated dislocation glide rate dominating at moderate/low temperatures and/or high stresses, and a climb rate dominating at high temperatures. Our study reveals the importance of plastic and creep anisotropy, and proposes new avenues for optimizing hole shape to minimize slip activity. This research bears significance for the broader material science, high temperature, and fatigue communities.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Mechanical
Zixu Guo, Dawei Huang, Xiaojun Yan
Summary: In this study, a physics-based model is proposed to predict the gamma/gamma' microstructure evolution of single crystal superalloy at medium temperature and high stress level. The model considers multiple hardening mechanisms and is validated through creep fracture and interrupted tests, showing good agreement with the experimental results.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Mechanics
Qingcheng Yang, Somnath Ghosh
Summary: An efficient and effective crystal plasticity model is proposed for porous HCP crystals, which is validated through RVE studies.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Nanoscience & Nanotechnology
Manmath Kumar Dash, Yu-Lung Chiu, Ian P. Jones, J. C. F. Millett, G. Whiteman
Summary: This study investigates the mechanical behavior of single crystal Ta shocked along three principal crystallographic directions. It is found that the flow curve and strain hardening vary significantly between the orientations, and shock loading causes relative changes. Yield strength increases linearly with shock load, with the [111] orientation having the highest yield strength. Deformation occurs through slip on {112} planes, and the accumulation of effective plastic strain varies with shock loading above 15 GPa.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Mechanical
Piao Li, Wen Jiang, Luca Susmel, Qi-nan Han
Summary: The fatigue limit of nickel-base single crystal (NBSX) at 980 degrees C was experimentally studied. The crack initiation position was found to be casting pores in the single crystal under scanning electron microscope (SEM), and a distinct fish-eye region was observed on the long cycle fatigue fracture surface. The failure mechanism was explored using focused ion beam (FIB) and electron backscatter diffraction (EBSD) techniques.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
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
Youssri El Majaty, Renald Brenner, Jean-Baptiste Leblond
Summary: This study presents a numerical simulation of transformation plasticity using FFT, which shows good agreement with a recent limit-analysis-based theory. The results demonstrate the effectiveness of the FFT simulations in capturing the transformation plasticity behavior.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2021)
Article
Biophysics
Luc Bremaud, Xiran Cai, Renald Brenner, Quentin Grimal
Summary: The study compared the effect of assuming different elastic properties in osteonal and interstitial tissues versus assuming average matrix properties on effective elasticity in cortical bone models. It found that matrix heterogeneity may be disregarded in most practical cases, with errors in predicted elasticity varying from 1 to 7% depending on pore volume fraction and assumed osteon diameter.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2021)
Article
Acoustics
Antoine Bale, Remi Rouffaud, Franck Levassort, Renald Brenner, Anne-Christine Hladky-Hennion
Summary: The paper presents a method to determine effective parameters of piezocomposite materials through a homogenization scheme to simplify transducer design. The results show that the method can achieve a relative error of less than 2% in the majority of cases, and also demonstrate the potential for simplifying the experimental procedure.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(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, Mechanical
F. Onimus, L. Gelebart, R. Brenner
Summary: The behavior of recrystallized zirconium alloys in nuclear reactors was simulated using Fast Fourier Transform (FFT) simulations. Original constitutive equations considering thermal creep, irradiation creep, and irradiation induced growth were proposed. The simulations showed good agreement with Transmission Electron Microscopy observations, highlighting the importance of an accurate polycrystalline model.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
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
Mechanics
Alireza Enferadi, Majid Baniassadi, Mostafa Baghani
Summary: This study presents the design and analysis of an SMP microvalve, where the thermomechanical response of the SMP is investigated using a nonlinear constitutive model that incorporates hyperelasticity and viscoelasticity. The model accounts for fluid-solid interaction and heat transfer in both fluid and solid physics. Numerical simulations are carried out to examine the important characteristics of the SMP valve. The results demonstrate the significance of employing fluid-solid interaction conjugated heat transfer analysis for the efficient development of microvalves in diverse applications.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hridya P. Lal, B. R. Abhiram, Debraj Ghosh
Summary: Higher-order elasticity theories are used to model mechanics at the nanoscale, but the length-scale parameters in these theories need to be evaluated through experiments or MD simulations. This study shows that the length-scale parameter in the modified strain gradient theory varies with dimensions, boundary conditions, and deformation level for carbon and boron nitride nanotubes. To address this issue, a supervised ML-based framework is developed, combining MD simulations, continuum formulation, and ML to predict the length-scale parameter for a given material, dimension, and boundary condition. This predictive tool reduces the need for expensive MD simulations and opens up possibilities for applying non-classical continuum theories to nanoscale mechanics problems.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Geng Chen, Shengzhen Xin, Lele Zhang, Min Chen, Christian Gebhardt
Summary: This paper develops a multiscale numerical approach to predict the failure probability of additive manufacturing (AM) structures subjected to time-varied loadings. The approach combines statistical homogenization, shakedown analyses, and reliability methods to consider the influence of microstructural features on load bearing capacity. Through case studies on exemplary structures and different material randomness assumptions, the robustness of the results is confirmed and the mechanism of how micropores influence structural reliability is explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Guillaume Cadet, Manuel Paredes
Summary: This study proposes a comprehensive solution for calculating the stress field on the surface of a curved beam with a circular cross section, which is crucial for probabilistic fatigue life analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hongshi Ruan, Xiaozhe Ju, Junjun Chen, Lihua Liang, Yangjian Xu
Summary: This paper proposes a data-driven approach to improve the efficiency of computational homogenization for nonlinear hyperelastic materials. By combining clustering analysis, Proper Orthogonal Decomposition (POD), and efficient sampling, a reduced order model is established to accurately predict elastoplasticity under monotonic loadings. The numerical results show a significant acceleration factor compared to a purely POD-based model, which greatly improves the applicability for structural analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Pep Espanol, Mark Thachuk, J. A. de la Torre
Summary: The motion of a rigid body, described by Euler's equations in Classical Mechanics, assumes that the distances between constituent particles are fixed. However, real bodies cannot meet this assumption due to thermal fluctuations. In order to incorporate dissipative and thermal fluctuation effects into the description, a generalization of Euler's equations is proposed. This theory explains the origin of these effects as internal, rather than caused by an external thermal bath, and derives the stochastic differential equations governing the body's orientation and central moments.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Prateek Chandrakar, Narayan Sharma, Dipak Kumar Maiti
Summary: The current study focuses on the deterioration in thermal buckling performance of variable angle tow laminated (VATL) plates caused by damages in various composite and damage characteristics. Through numerical simulations and surrogate models, it was found that damages reduce the sensitivity of composite properties to buckling response, and a distinctive pattern of buckling response was observed when composite properties vary.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Liangteng Guo, Shaoyu Zhao, Jie Yang, Sritawat Kitipornchai
Summary: This study introduces composites reinforced with graphene origami nanofillers into functionally graded multilayered phononic crystals. Numerical investigations reveal that these materials possess negative Poisson's ratio and offer unique mechanical properties, which can be tuned by adjusting the weight fraction and hydrogen coverage of the graphene fillers.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Kai Li, Haiyang Wu, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel self-oscillating liquid crystal elastomer fiber-beam system that can sway continuously and periodically under steady illumination. The governing equations of the system are established and the self-swaying process and motion mechanism are described in detail. Numerical results show the system undergoes supercritical Hopf bifurcation and the effects of system parameters on the self-swaying amplitude and frequency are discussed quantitatively.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Lingkang Zhao, Peijun Wei, Yueqiu Li
Summary: This paper proposes a spatial-temporal fractional order model to study the dynamic behavior of thermoelastic nanoplates in a thermal environment. The model provides a flexible approach to describe the small-scale effects and complex history-dependent effects. Analytical and numerical methods verify the reliability of the model, and the effects of parameters on the dynamic response are discussed.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
A. N. O'Connor, P. G. Mongan, N. P. O'Dowd
Summary: This research presents an autonomous framework that combines Bayesian optimization and finite element analysis to identify ductile damage model parameters. The framework has been successfully applied to P91 material datasets and demonstrates the impact of algorithm hyperparameters on the resulting non-unique ductile damage parameters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
S. V. Sorokin, S. Lenci
Summary: This paper reconsiders the nonlinear coupling between flexural and longitudinal vibrations of ideally straight elastic beams, using a nonlinear theory of curved beams and employing class-consistent boundary conditions. A paradoxical difference in the nonlinear parts of the Duffing equations obtained in the limit of vanishing curvature and in the case of an ideally straight beam is demonstrated and explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Hari Manoj Simha
Summary: Dynamic Mode Decomposition (DMD) can be used to construct deformation fields for linear solids without making constitutive assumptions or knowing material properties. It operates on time-shifted data matrices and selects dominant modes using singular value decomposition. DMD can be used for reconstructing displacement states in elastic solids and identifying the onset of plasticity in elastic-plastic solids.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Ren, K. F. Wang, B. L. Wang
Summary: An electromechanical model is established to investigate the characteristics of a bilayer structure consisting of a piezoelectric semiconductor film and an elastic substrate. The combined effects of piezoelectricity and flexoelectricity are considered, and closed-form expressions for the distributions of electron concentrations and relevant electromechanical fields are obtained. The effects of interfacial parameter, flexoelectricity, and initial carrier concentration are discussed. The research highlights the importance of the interfacial parameter and the weakening effect of flexoelectricity on the imperfect interface of the bilayer system.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Yu Sun, Qiang Han, Chunlei Li
Summary: This paper presents the design of a tunable functionally graded metamaterial beam for flexural wave attenuation through the integration of a piezomagnetic shunt damping system and an inertial amplification mechanism. The proposed system demonstrates tunable and strong wave attenuation capability through local resonance and energy consumption. The theoretical and numerical results verify that the system can achieve significant wave attenuation at defined frequencies and also be optimized for maximal attenuation at various frequency ranges.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
