Article
Engineering, Mechanical
C. Keller, M. Calvat, B. Flipon, F. Barbe
Summary: In this article, the plastic strain mechanisms of AISI 316L with bimodal grain size distributions were investigated using experimental characterizations and numerical simulations. The results showed that the grain size distribution greatly affected the deformation mechanisms, particularly with the formation of low stress channels and localization shear bands under different conditions of grain size populations and spatial distributions.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Metallurgy & Metallurgical Engineering
V. Yu Novikov
Summary: Grain growth in textureless material with bimodal grain size distribution has been investigated, showing that the presence of abnormally coarse crystallites can be eliminated in the final distribution. This phenomenon occurs when the number of coarse crystallites in the initial state is small and can be explained by normal grain growth in the fine-grained matrix. The size effect of matrix grains on the distribution's second maximum has been analyzed, revealing that it remains and even increases due to the inhibition of boundary migration.
PHYSICS OF METALS AND METALLOGRAPHY
(2021)
Article
Materials Science, Multidisciplinary
Mohammad Ali Mostafaei, Mohsen Kazeminezhad
Summary: Different heating rates were used during ultra-rapid annealing of severely deformed low carbon steel, resulting in improved hardness, strength, and ductility. The formation of a bimodal grain size (BGS) microstructure at a heating rate of 600 degrees C/s and a temperature of 730 degrees C led to the best performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Chemistry, Multidisciplinary
Hongfang Zhang, Liqiang Liu, Ju Gao, K. W. Kwok, Sheng-Guo Lu, Ling-Bing Kong, Biaolin Peng, Fang Hou
Summary: 0.9KNbO(3)-0.1BaTiO(3) ceramics with bimodal grain size distribution and relaxor-like behavior were prepared using an induced abnormal grain growth method, showing a large room-temperature electrocaloric effect.
Article
Materials Science, Multidisciplinary
Changping Tang, Lei Cui, Haichun Jiang, Wenhui Liu, Jing Li, Xiao Liu, Heng Li
Summary: This study investigates the influence of initial grain size on the formation of bimodal-grained microstructure and mechanical properties of a Mg-11Gd-3Y-0.5Nd-Zr alloy. It is found that the fraction of unrecrystallized grains in the bimodal-grained microstructure is determined by the initial grain size, with a higher fraction observed in samples with larger initial grain size. The formation of unrecrystallized grains in samples with small initial grain size is caused by the uneven distribution of grain sizes, while in samples with large initial grain size, it is mainly influenced by the difference in orientation among grains. The strength of the alloy increases with increasing initial grain size, while the elongation decreases. The sample with the largest initial grain size exhibits the highest ultimate tensile strength. The higher strength is attributed to the texture strengthening and hetero-deformation induced by the higher fraction of unrecrystallized grains.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Shuwan Cui, Shuwen Pang, Dangqing Pang, Qin Zhang, Zhiqing Zhang
Summary: This paper successfully welded 8 mm thickness 2205 duplex stainless steel plates using K-TIG welding, and confirmed the accuracy of experiments through numerical simulations. The results indicated that a combined model of ellipsoid and conical heat sources is more suitable for K-TIG welding. The impact of welding speed on microstructure and grain size of welded joint was observed, with simulation results consistent with experimental findings, validating the effectiveness of the simulation method for guiding K-TIG welding processes.
Article
Metallurgy & Metallurgical Engineering
Shahmeer Baweja, Shailendra P. Joshi
Summary: This work systematically investigates the microstructure-property relationship in Mg alloys, particularly focusing on the impact of grain size and texture on material strengthening, hardening, plastic anisotropy, and tension-compression asymmetry. High resolution crystal plasticity modeling is used to understand these effects. The study performs 528 three-dimensional finite element calculations with varied textures, grain sizes, loading orientations, and loading states. The results show that the grain size effect follows the Hall-Petch relation and is influenced by both loading orientation and initial texture. The study also predicts non-monotonic effects of grain size and texture on material ductility.
JOURNAL OF MAGNESIUM AND ALLOYS
(2023)
Article
Multidisciplinary Sciences
Katharina Tholen, Thomas Pahtz, Hezi Yizhaq, Itzhak Katra, Klaus Kroy
Summary: In this study, a quantitative model is used to derive a unified phase diagram for aeolian sand transport and megaripple morphodynamics. A quantitative signature of bimodal aeolian transport is discovered, which is supported by comprehensive analysis of terrestrial and extraterrestrial data.
NATURE COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Wuqiang He, Feng Liu, Liming Tan, Lan Huang, Yan Nie, Guowei Wang, Xin Zhan, Zijun Qin
Summary: Two nickel-base oxide dispersion strengthened (ODS) alloys with uniform and bimodal distribution of grains size were fabricated by mechanical alloying (MA) and hot extrusion (HEX). The bimodal-grained alloy showed a better combination of strength and ductility compared to the alloy with uniform grains size.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Engineering, Manufacturing
Umashankar Tripathi, Nitin Saini, Rahul S. Mulik, Manas Mohan Mahapatra
Summary: In this study, a gas tungsten arc welding-based wire-arc additive manufacturing setup was developed, and a low-carbon alloy steel was used to fabricate a geometry. The mechanical properties and microstructure of the printed alloy were analyzed, revealing good tensile properties and fracture toughness, but significant scatter in hardness tests concerning the building direction.
CIRP JOURNAL OF MANUFACTURING SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Jinhua Huang, Shuigen Huang, Jef Vleugels
Summary: By using thermodynamic simulation, NbC-Ni based cermets with different W and C additions were designed and sintered in liquid state, resulting in varied phase constitution, microstructure, and mechanical properties. Microscopic analysis revealed the presence of cubic (Nb,W)C solid solution, Ni alloy binder, and carbon-deficient phase in the cermets. Additionally, mechanical properties such as hardness, toughness, and strength were found to be influenced by the phases and NbC grain size.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
J. Liu, J. C. Jie, B. Peng, J. P. Qu, X. L. Wang, T. J. Li
Summary: The grain size and properties of Al-Si alloys are strongly influenced by the Si content. Increasing Si content leads to a transition from coarse columnar grains to uniformly distributed equiaxed grains, resulting in a decrease in grain size and an increase in tensile strength but a decrease in ductility. The casting temperature and alloy composition also play important roles in determining the microstructure and properties of Al-Si alloys.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Zeinab Savaedi, Hamed Mirzadeh, Rouhollah Mehdinavaz Aghdam, Reza Mahmudi
Summary: In addition to grain size, other factors such as texture, distribution of alloying elements, and homogeneity of the microstructure also affect the mechanical properties and corrosion resistance of magnesium alloys. This study investigates the effect of grain size on tensile properties, hardness, and bio-corrosion resistance of commercially pure magnesium through grain growth annealing and hot rolling. The grain growth kinetics and corrosion behavior of commercially pure magnesium are analyzed, and the results show that grain coarsening enhances corrosion resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Nanoscience & Nanotechnology
Chao He, Ming Yuan, Bin Jiang, Lintao Liu, Qinghang Wang, Yanfu Chai, Wenjun Liu, Guangsheng Huang, Dingfei Zhang, Fusheng Pan
Summary: The study found that grain size has an impact on the bendability of Mg-2Gd alloy sheets, with coarser grain size leading to poorer bendability. This phenomenon is significantly different from traditional Mg alloys.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Zhenyuan Gong, Kang Guan, Pinggen Rao, Qingfeng Zeng, Jiantao Liu, Zhiqiang Feng
Summary: A dual-scale model was proposed to study the effect of microstructure parameters on the thermal shock damage mechanism of alumina. By simulating crack nucleation and propagation, it was found that decreasing grain size and increasing grain boundary fracture energy have a positive effect on improving thermal shock resistance.
FRONTIERS IN MATERIALS
(2021)
Article
Polymer Science
Credson Langueh, Sylvie Changotade, Salah Ramtani, Didier Lutomski, Geraldine Rohman
Summary: Biodegradable elastomers are increasingly used in soft tissue engineering, but more research is needed to predict scaffold lifetime and easily evaluate the durability of new scaffolds.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Biophysics
H. Bennaceur, S. Ramtani, T. Outtas, T. Boukharouba
Summary: Stability-initiated failure dominates in bone, especially in older bone, due to the instability of single trabeculae which is prone to inelastic buckling. The goal of this study is to improve the mechanistic understanding of bone buckling failure, with a simplified adaptive-beam buckling model formulated within the context of nonlocal adaptive continuum mechanics. Controlled buckling tests of single trabeculae from three medial tibia end sections were conducted for comparison with the response of the simplified model.
JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY
(2021)
Article
Computer Science, Interdisciplinary Applications
Diego Quexada-Rodriguez, Kalenia Marquez-Florez, Miguel Cerrolaza, Carlos Duque-Daza, Olfa Trabelsi, M. A. Velasco, Salah Ramtani, Marie Christine Ho-Ba-Tho, Diego Garzon-Alvarado
Summary: The article proposes a new methodology for solving the bone remodeling problem more efficiently by discretizing trabecular structures with one-dimensional elements. By using an Euler integration scheme coupled with momentum equations, it successfully predicts the trend of formation patterns of main trabecular groups from different cancellous bones.
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING
(2022)
Editorial Material
Materials Science, Multidisciplinary
Eric Hug, Guy Dirras
Article
Engineering, Multidisciplinary
A. Douhou, S. Ramtani
Summary: The study investigates the effect of radially directed fluid diffusion through a thick-walled fibrous hollow cylinder under large deformations, revealing interesting influences of arterial stiffness, stretching, and torsion on mass flux and stretch ratios. These findings could aid in improving prosthetic conduit manufacturing methods and understanding de-stiffening therapy as a potential strategy for reducing stroke incidence and enhancing functional prognosis.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2021)
Article
Computer Science, Interdisciplinary Applications
Diego Quexada, Salah Ramtani, Olfa Trabelsi, Kalenia Marquez, Marie-Christine Ho Ba Tho, Dorian Luis Linero Segrera, Carlos Duque-Daza, Diego Alexander Garzon Alvarado
Summary: This article couples a cell population model with a mechanical stimulus model using a discrete approach to study the relationship between cell dynamics and mechanical loading in bone remodeling. The model is implemented in a 2D domain and the simulation results demonstrate its effectiveness in modeling bone remodeling and pathological behaviors. The study highlights the usefulness of the discrete modeling technique in this particular application.
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Kei Ameyama, Fabien Cazes, Herve Couque, Guy Dirras, Shoichi Kikuchi, Jia Li, Frederic Mompiou, K. Mondal, Dmytro Orlov, Bhupendra Sharma, David Tingaud, Sanjay K. Vajpai
Summary: The harmonic structure is a new concept that allows engineering metallic materials to achieve excellent mechanical performance. It consists of soft coarse-grained regions surrounded by a network of hard ultra-fine grained regions. The interaction between these regions produces a synergistic effect, leading to superior mechanical properties. This review critically assesses the concept and discusses key issues for further study.
MATERIALS RESEARCH LETTERS
(2022)
Article
Engineering, Mechanical
Nabil Noui, Fatima Zouhra Arzour, Taoufik Boukharouba, Mohammed Hadj-Meliani, Chokri Bouraoui, Salah Ramtani
Summary: In this work, an extension of the stress-intensity factor model to long semi-elliptic shaped cracks is proposed. The extension takes into account the effect of premature closure and load ratio, which are the two factors directly influencing the propagation behavior of this crack type. The new model is validated using fatigue results reported in literature on thick plates by three-point bending with three load ratios. This methodology provides engineers with a simplified method to evaluate the harmfulness of this type of cracks and opens new perspectives on the use of a crack surface in fatigue studies.
NAUKA I TEHNOLOGII TRUBOPROVODNOGO TRANSPORTA NEFTI I NEFTEPRODUKTOV-SCIENCE & TECHNOLOGIES-OIL AND OIL PRODUCTS PIPELINE TRANSPORTATION
(2022)
Article
Mechanics
A. Douhou, S. Ramtani
Summary: This paper discusses the modeling of steady fluid diffusion and solid large deformation in a fibrous two-layer thick-walled hollow cylinder using the mechanics of interacting continua. By assuming a perfect interface between the two layers and considering the properties of a rubber-fluid mixture, new results regarding pressure difference and stress distribution are obtained. These findings could potentially contribute to the understanding of de-stiffening therapy and the design of prosthetic conduits for living tissue.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2023)
Article
Engineering, Biomedical
Abderrazak Kedadria, Yacine Benabid, Oussama Remil, Abdelkader Benaouali, Abdelghani May, Salah Ramtani
Summary: This study aims to create a shoulder musculoskeletal model with complex muscle geometries by reconstructing the shape of fibers in six adjacent muscles using an automated technique. Highly discretized muscle representations were used to simulate different shoulder movements and validate the moment arms. The developed musculoskeletal models generated more realistic geometries compared to line segments, expanding the physical representation of muscles.
ANNALS OF BIOMEDICAL ENGINEERING
(2023)
Article
Biophysics
Salah Ramtani, Juan Felipe Sanchez, Abdelkader Boucetta, Reuben Kraft, Juan Jairo Vaca-Gonzalez, Diego. A. A. Garzon-Alvarado
Summary: This paper aims to construct a general framework for coupling tumor-bone remodeling processes and investigates the effects of tumors on osteoclasts, osteoblasts, and bone turnover cycle. Three models are explored to incorporate tumor presence into Komarova's model, including using a damage parameter, a paracrine effect parameter, and replicating Ayati's model. Stability analysis and examples are provided to simulate tumor effects. The paper is divided into three parts: exposition of the models, results and discussion, and conclusion.
BIOMECHANICS AND MODELING IN MECHANOBIOLOGY
(2023)
Article
Endocrinology & Metabolism
Diego Quexada-Rodriguez, Olfa Trabelsi, Marie-Christine Hobatho, Salah Ramtani, Diego Garzon-Alvarado
Summary: The morphology of the growth plate undergoes transformations throughout development, affecting stress distribution in long bone epiphysis. This study is the first attempt to explore the relationship between growth plate morphology and trabecular bone patterns. Finite element model analysis of two medical cases revealed a correlation between main trabecular groups and growth plate morphology. Our findings align qualitatively and quantitatively with clinical data on slipped capital femoral epiphysis and sever's disease, suggesting further research on growth plate morphology's impact on bone remodeling and preventive measures for bone disorders.
Article
Engineering, Biomedical
Abdelkader Boucetta, Salah Ramtani, Diego A. Garzon-Alvarado
Summary: When physical forces are applied to bone, its mechanical adaptive behaviors change according to the microarchitecture configuration, which affects the remodeling cell population and fluid flow in lacunar canalicular network (LCN). The fluid flow alteration leads to changes in membrane electrical potential and shear stress, eventually causing the formation of microcracks and modifying cell activity. By proposing a model of electro-mechanical energy spread, this study investigates the role of fluid flow in LCN and its impact on osteocytes efficiency and osteoblast regulation. Numerical simulation reveals results that cannot be measured in vitro/in vivo studies, providing insights for improving bone scaffolds and implantation regions.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2023)
Article
Engineering, Multidisciplinary
A. Jabbar Hassan, T. Boukharouba, D. Miroud, N. Titouche, S. Ramtani
INTERNATIONAL JOURNAL OF ENGINEERING
(2020)
Article
Biophysics
Abdelkader Boucetta, Taoufik Boukharouba, Salah Ramtani, Ridha Hambli
JOURNAL OF MECHANICS IN MEDICINE AND BIOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)