International Journal of Plasticity最新文献

{"title":"A computational model for simulating thermo-elasto-plastic failures using non-localizing and localizing gradient damage","authors":"Sandipan Baruah,&nbsp;Indra Vir Singh","doi":"10.1016/j.ijplas.2025.104442","DOIUrl":"10.1016/j.ijplas.2025.104442","url":null,"abstract":"<div><div>The conventional strategy for simulating thermo-mechanical failures using localizing gradient damage is based on an elastic material-model. It does not incorporate the physics of plastically-driven failures under combined thermal and mechanical loads. Moreover, the conventional formulation neglects the effect of damage on heat-capacity and avoids certain essential physics-based couplings among the deformations, damage and temperature. Therefore, in this work, a novel computational framework based on non-localizing and localizing gradient damage is developed for simulating thermo-elasto-plastic failure of materials, under the influences of both mechanical and thermal loads. The present strategy is derived from the law of thermodynamic power-balance and the free-energy density function. Unlike previous works, the present framework considers the effect of damage-based degradation on both thermal conductivity and heat-capacity. A new set of constitutive relations for thermo-elasto-plastic damage are developed in incremental form to incorporate the stress fields, local and non-local equivalent plastic strains, damage and temperature. Using these constitutive equations, new formulations of coupled-stiffness matrices and heat-capacity matrices are derived in the context of gradient damage. The cross-influences of damage, temperature and deformation on each other are incorporated through these matrices. The capability of the present framework is demonstrated by solving several examples on thermo-elasto-plastic ductile failures using finite element approach.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104442"},"PeriodicalIF":12.8,"publicationDate":"2025-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144797126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Anisotropic yield loci and inverse Swift effect in extruded AZ31 Mg alloy under multi–degree-of-freedom torsional–axial non-proportional loading paths","authors":"Mingyang Jiao ,&nbsp;Zhijia Liu ,&nbsp;Jing Tan ,&nbsp;Yang Li ,&nbsp;Yan Peng ,&nbsp;Ruihong Li ,&nbsp;Chuanpu Liu ,&nbsp;Baodong Shi ,&nbsp;Xianhua Chen ,&nbsp;Fusheng Pan","doi":"10.1016/j.ijplas.2025.104439","DOIUrl":"10.1016/j.ijplas.2025.104439","url":null,"abstract":"<div><div>The deformation mechanisms of Mg alloy under multi<strong>–</strong>degree-of-freedom axial, torsional, and combined loadings remains critically unclear. This is particularly significant in the case of the anisotropic evolution of yield loci and inverse Swift effect, which are crucial for optimizing the forming technologies for engineering parts. In order to clarify the underlying deformation mechanisms, combined multi–degree-of-freedom axial–torsional non-proportional loading paths are specially designed. The anisotropic evolution of the yield loci and Swift–inverse Swift effects in extruded AZ31 Mg alloys are investigated. The strong loading-path–dependent twinning activities and underlying deformation mechanisms are clarified in detail. The findings reveal that the inverse Swift effect during free rotational tension (FR_Ten) is attributed to the residual shear stress and initial texture heterogeneity, while the spontaneous macroscopic rotation during free rotational compression (FR_Com) is found to originate from the heterogeneous local strain induced by the interactions of the <span><math><mrow><mo>{</mo><mn>10</mn><mover><mn>1</mn><mo>¯</mo></mover><mn>2</mn><mo>}</mo></mrow></math></span> twins. Free end torsion (FE_Tor) pre-straining induces subsequent yield locus (SYL) rotation towards the positive τ axis and expansion along the negative σ axis. The anisotropic Swift–inverse Swift effects are accurately captured by the plastic strain-components on the yield loci. Tensile twinning and basal slip coordinate the plastic deformation under FR_Com-dominated loading paths, owing to the low twin favourability, and the relative activities of non-basal slips under FR_Ten-dominated loading paths are significantly improved. The evolutions of the Swift–inverse Swift effects are determined by elastic pre-loadings, resulting in loading–path-dependent anisotropic evolutions of mechanical responses.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104439"},"PeriodicalIF":12.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144792291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Predicting shear coupling behaviors in disconnection-mediated migration of asymmetrical tilt grain boundaries","authors":"Ruoqi Dang ,&nbsp;Yong-Wei Zhang ,&nbsp;Huajian Gao","doi":"10.1016/j.ijplas.2025.104441","DOIUrl":"10.1016/j.ijplas.2025.104441","url":null,"abstract":"<div><div>Grain boundaries (GBs) play a critical role in determining the mechanical properties of polycrystalline materials. Due to their inherent structural complexity and atomic variability, characterizing the loading response of GBs can be highly challenging. Disconnections, a type of line defects at GBs, have been widely used to model the migration of GBs under shear and has been extensively validated through experiments. While this approach has proven effective for symmetrical tilt grain boundaries (STGBs), it has encountered challenges when modeling asymmetrical tilt grain boundaries (ATGBs). Here, we combine molecular dynamics (MD) simulations with a disconnection-based theoretical model to investigate disconnection-mediated migration of ATGBs in Cu. Our model, which treats an ATGB under shear as a combination of two STGBs, yields predictions in excellent agreement with results from MD simulations for cases undergoing solely disconnection-mediated migration. We further discuss the adaptability of our model across various GB types and temperatures, covering more complex migration mechanisms. This study enhances our understanding of shear-coupled migration of ATGBs and offers potentially useful insights for GB engineering.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104441"},"PeriodicalIF":12.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The controlled incident dislocation boundaries and cell arrangements promoted multi-variant transformation and enhanced strain-hardening in a metastable ferrous medium entropy alloy","authors":"Jiehua Chen, Yu Li, Linghuan Pang, Binjun Wang, Bin Fu, Yonghui Yang, Xiaoshuai Jia","doi":"10.1016/j.ijplas.2025.104438","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104438","url":null,"abstract":"In this work, we introduced and regulated incident dislocation boundaries (IDBs) to tailor cellular structures in a metastable ferrous Fe₅₀Mn₃₀Co₁₀Cr₁₀ medium-entropy alloy (MEA) through successive cold-warm rolling (CWR). This approach aimed to enhance yield strength (YS) without compromising ductility. Compared to one-step warm rolling (WR), the prior cold deformation introduced a higher density of mobile dislocations and intensified dislocation-dislocation interactions, promoting the formation of finer and more numerous dislocation cells. Both rolled samples exhibited higher YS while maintaining uniform elongation (UEL) levels comparable to those of the dislocation-free as-annealed reference. Notably, the CWR samples demonstrated simultaneous improvements in YS and strain hardening rate (SHR), and reduced mechanical anisotropy, particularly under liquid nitrogen temperature (LNT) deformation. The enhanced YS primarily stems from grain refinement via densely distributed dislocation cells, while the reduced mechanical anisotropy arises from a weakened {001}&lt;111&gt; texture due to dislocation-assisted recrystallization. Although IDBs initially decelerate phase transformation kinetics during early deformation, the refined cell structure in CWR samples facilitates multi-variant nucleation of nano-lamellar ε-laths and microbands, thereby generating dynamic Hall-Petch barriers for strain hardening. Additionally, the elevated flow stress promotes the proliferation of nano-lamellar ε-laths within microbands and enables reversible γ-domain formation at the shear intersection zones of multi-variant ε-laths. Consequently, the CWR-processed MEA achieves a high YS of ∼985 MPa and sustains an exceptional SHR of ∼3.5 GPa at LNT. This study establishes a \"dislocation engineering\" strategy to circumvent the traditional strength-ductility and YS-SHR trade-offs in metastable ferrous MEAs.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"144 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786502","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Atomic-scale investigations on the interaction mechanisms of dislocations with {112¯1} and {112¯2} twinning","authors":"Hao Zhang, Kui Rao, Yanghuanzi Li, Hongzhi Cui, Song Ni, Feiya Liu, Jie Xiong, Ji Gu, Min Song","doi":"10.1016/j.ijplas.2025.104430","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104430","url":null,"abstract":"The interaction mechanisms of &lt;&lt;strong&gt;&lt;em&gt;c&lt;/em&gt;&lt;/strong&gt;+&lt;strong&gt;&lt;em&gt;a&lt;/em&gt;&lt;/strong&gt;&gt; dislocations with {&lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;} and {&lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/span&gt;} twin boundaries (TBs) were systematically investigated at the atomic-scale in pure Ti via molecular dynamics (MD) simulations and transmission electron microscopy (TEM) characterizations. Results reveal that under pure shear loading, &lt;&lt;strong&gt;&lt;em&gt;c&lt;/em&gt;&lt;/strong&gt;&lt;em&gt;+&lt;/em&gt;&lt;strong&gt;&lt;em&gt;a&lt;/em&gt;&lt;/strong&gt;&gt; dislocations dissociate into &lt;&lt;strong&gt;&lt;em&gt;a&lt;/em&gt;&lt;/strong&gt;&gt; dislocations, twinning dislocations (TDs) &lt;span&gt;&lt;math&gt;&lt;msubsup is=\"true\"&gt;&lt;mover is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"bold-italic\"&gt;b&lt;/mi&gt;&lt;mstyle displaystyle=\"false\" is=\"true\" scriptlevel=\"2\"&gt;&lt;mo is=\"true\"&gt;⇀&lt;/mo&gt;&lt;/mstyle&gt;&lt;/mover&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;/&lt;/mo&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;, and an interfacial defect &lt;span&gt;&lt;math&gt;&lt;msubsup is=\"true\"&gt;&lt;mover is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"bold-italic\"&gt;b&lt;/mi&gt;&lt;mstyle displaystyle=\"false\" is=\"true\" scriptlevel=\"2\"&gt;&lt;mo is=\"true\"&gt;⇀&lt;/mo&gt;&lt;/mstyle&gt;&lt;/mover&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;10&lt;/mn&gt;&lt;mo is=\"true\"&gt;/&lt;/mo&gt;&lt;mn is=\"true\"&gt;12&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt;, or into sessile &lt;&lt;strong&gt;&lt;em&gt;c&lt;/em&gt;&lt;/strong&gt;&gt; dislocation with TDs &lt;span&gt;&lt;math&gt;&lt;msubsup is=\"true\"&gt;&lt;mover is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"bold-italic\"&gt;b&lt;/mi&gt;&lt;mstyle displaystyle=\"false\" is=\"true\" scriptlevel=\"2\"&gt;&lt;mo is=\"true\"&gt;⇀&lt;/mo&gt;&lt;/mstyle&gt;&lt;/mover&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;mo is=\"true\"&gt;/&lt;/mo&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"true\"&gt;¯&lt;/mo&gt;&lt;/mover&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;mo is=\"true\"&gt;)&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;&lt;/span&gt; and &lt;span&gt;&lt;math&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;msubsup is=\"true\"&gt;&lt;mover is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"bold-italic\"&gt;b&lt;/mi&gt;&lt;mstyle displaystyle=\"false\" is=\"true\" scriptlevel=\"2\"&gt;&lt;mo is=\"true\"&gt;⇀&lt;/mo&gt;&lt;/mstyle&gt;&lt;/mover&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;mo is=\"true\"&gt;/&lt;/mo&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;(&lt;/mo&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;11&lt;/mn&gt;&lt;mover accent=\"true\" is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;mo is=\"tr","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"65 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786501","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Integrated polycrystalline plasticity–cellular automaton model for microstructure evolution driven by discontinuous dynamic recrystallization during thermo-mechanical processing of magnesium alloys","authors":"Wenjie Wu, Jinheung Park, Wenzhen Chen, Guowei Zhou, Seo Yeon Jo, Peike Yang, Chao Cui, Wenke Wang, Myoung-Gyu Lee","doi":"10.1016/j.ijplas.2025.104437","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104437","url":null,"abstract":"In this study, an integrated polycrystalline plasticity model, referred to as the VPSC-dDRX(CA) approach, was developed for the first time by combining the viscoplastic self-consistent (VPSC) framework, discontinuous dynamic recrystallization (dDRX) mechanism, and a cellular automaton (CA), to predict the microstructure evolution of magnesium alloys during hot deformation. The model was calibrated using isothermal uniaxial compression tests on as-extruded AZ31B magnesium alloy. Temperature- and strain rate-dependent constitutive relationships were established to describe dislocation density (DD) hardening and dDRX behavior over the range of 523–673 K and 0.001–0.1 s⁻¹. Simulation and experimental results under uniaxial compression showed that higher temperatures and lower strain rates enhanced prismatic slip activity, promoted dDRX, and weakened the &lt;0002&gt;//CD texture. The high accuracy of the proposed multiscale framework is evidenced by grain size errors of less than 5% and texture intensity deviations under 10%. The engineering applicability of the proposed model was illustrated through simulations of multi-directional forging (MDF) and conical-die forward extrusion (CDE), which respectively revealed the path sensitivity and regional heterogeneity of microstructural evolution. The proposed model provides accurate predictions of microstructure and texture evolution under complex deformation conditions, offering a robust framework for assessing region-specific mechanical responses and guiding the design of magnesium alloy forming processes.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"8 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786503","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanistic Origin of Size Effects in Crystal Plasticity: Strain Gradients and Other Theories Explained","authors":"Arya D. Nugraha, Gustavo M. Castelluccio","doi":"10.1016/j.ijplas.2025.104436","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104436","url":null,"abstract":"Mechanical properties–strength, fracture toughness, fatigue resistance–arise from the inherently multiscale nature of deformation and failure. Forces at the macroscopic level drive atomic-scale processes, which are regulated by mesoscale attributes such as grain size and dislocation structures. Thus, the engineering of novel materials requires a thorough understanding of complex interactions across multiple length scales. However, mechanistic explanations for size effects remain elusive in the literature. Instead, most modeling efforts have relied on phenomenological formulations, which offer limited predictive accuracy beyond their calibration domains.This paper systematically explores mechanistic contributions to size effects to predict single- and poly-crystal mechanical responses. We identify three size-dependent mechanisms that can be incorporated into plastic deformation models to capture size effects in single- and poly-crystals for metals and alloys under tension, compression, and bending. The size-dependent algorithms do not introduce new phenomenological parameters but rely on material-invariant formulations that can be employed across single-phase FCC materials without recalibration. Notably, this understanding enables the tuning of microstructures for specific mechanical properties before manufacturing. The analysis further explains the relative contribution of size effects on isotropic and kinematic hardening as well as their significance for different crystallographic orientations. We further provide a physical interpretation for the origin of strain gradient theories and mechanistic size effects in the absence of macroscopic, geometry-induced strain gradients. We conclude by highlighting the coupling of mechanisms and their relative contributions at different strain levels.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"70 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144786504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrostatic pressure tuned grain boundary mobility in polycrystalline metals","authors":"Qishan Huang, Zhenghao Zhang, Yao Tang, Haofei Zhou","doi":"10.1016/j.ijplas.2025.104433","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104433","url":null,"abstract":"Grain boundary (GB) plasticity plays a pivotal role in the mechanical behaviours of polycrystalline materials. The kinetics and deformation of GBs depend on both GB geometry and local stress states. While classic GB theories primarily focus on shear-driven GB kinetics, the fundamental mechanism by which hydrostatic pressure influences GB plasticity remains largely unclear, despite the evidence that polycrystalline materials subjected to substantial pressures can exhibit distinct mechanical properties. Here, we investigate pressure-tuned GB kinetics in polycrystalline metals through a series of atomistic simulations combined with experimental validations. We demonstrate that under constant temperature annealing, the application of pressure can reduce GB mobility and thus the rate of grain growth, which originates from the pressure-enhanced activation energies for disconnection nucleation and gliding. More importantly, pressure can shift GB deformation mechanism from disconnection-annihilation-mediated GB migration to disconnection-accumulation-mediated GB rotation, resulting in an asymmetry-to-symmetry GB structural transformation and generating a large volume of special GBs. An energetic model based on pressure-dependent disconnection dynamics is proposed to interpret the pressure-tuned GB mobility, offering insights into the understanding of pressure-assisted grain growth retardation in polycrystalline metals widely reported in the literature.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"1 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144748109","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Shear-compaction band evolution in dry and saturated porous media using a hybrid Finite Element Method/Peridynamic model","authors":"Tao Ni ,&nbsp;Lumiao Guo ,&nbsp;Jianfu Shao ,&nbsp;Jin Zhang ,&nbsp;Qizhi Zhu ,&nbsp;Bernhard A. Schrefler","doi":"10.1016/j.ijplas.2025.104429","DOIUrl":"10.1016/j.ijplas.2025.104429","url":null,"abstract":"<div><div>This study presents a hybrid Finite Element Method/Peridynamic (FEM/PD) model to simulate the evolution of shear and compaction bands in dry and saturated porous media under compressive loading. A shear damage evolution criterion, based on macro equivalent shear strain, is proposed to describe localized shear band formation within the Ordinary State-based Peridynamic (OSB-PD) framework. Additionally, a grain crushing potential is incorporated into the constitutive scalar force density function to account for shear damage associated with grain crushing and pore collapse. By combining the OSB-PD equations for solid deformation and damage with the finite element method for fluid flow, the model provides a flexible tool for investigating shear and compaction band formation under pure mechanical and hydro-mechanical action. Numerical simulations are conducted to validate the model’s effectiveness. Parameter studies reveal that higher degradation function exponents result in more concentrated shear bands with smaller inclination angles. Convergence studies reveal key discretization parameters, such as horizon radius (<span><math><mi>δ</mi></math></span>) and <span><math><mi>m</mi></math></span>-ratio (<span><math><msub><mrow><mi>m</mi></mrow><mrow><mi>r</mi></mrow></msub></math></span>), which are critical for ensuring simulation stability and accuracy. Benchmark simulations demonstrate the model’s versatility, effectively simulating compaction band evolution under confining pressure and grain crushing conditions. The model also successfully captures the transition from shear bands to shear-enhanced or pure compaction bands as grain crushing or confining pressure increases. In saturated conditions, the model shows that excess pore pressure can suppress compaction band formation, particularly in low-permeability scenarios, thereby highlighting its ability to capture the influence of pore pressure on shear-compaction band evolution.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"193 ","pages":"Article 104429"},"PeriodicalIF":12.8,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737694","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Interlayer orientation effects on mechanical response of wire-arc additive manufactured multi-grade steel hybrid sandwich structures","authors":"Yuezhang Ju ,&nbsp;Shun Li ,&nbsp;Xiaocong Yang ,&nbsp;Xue Yin ,&nbsp;Chengning Li ,&nbsp;Xinjie Di","doi":"10.1016/j.ijplas.2025.104435","DOIUrl":"10.1016/j.ijplas.2025.104435","url":null,"abstract":"<div><div>In this study, multi-grade steel hybrid sandwich structures with interlayer orientation were designed and fabricated using additive manufacturing (AM) technology. This design effectively combines the high strength from high-grade steel (HGS) and the superior ductility provided by low-grade steel (LGS). Macroscopic digital image correlation (DIC) and in-situ electron backscatter diffraction (EBSD) analyses reveal that the tensile co-coordinated deformation mechanism of two steels is mainly based on staged deformation. During the stretching process, HGS layer is first used to increase the strength of the structure, followed by LGS layer to provide significant deformation capacity. Furthermore, when the deposition direction of both steel layers aligns with the loading direction, the structure completes coordinated deformation only through staging. When there are interlayer orientation differences, coordinates deformation of structure not only through staging, but also relies on the interlayer strain gradients, which drives 66–75 MPa strengthen. On this basis, when the deposition direction of HGS layer is at an angle of 0° to the force direction, it allows cracks to propagate transversely through the martensitic laths, fully exploiting the mechanical advantage of the lath martensite (LM). When the deposition direction of LGS layer is at an angle of 45° to the loading direction, it promotes dislocations to slide along the boundaries, reduces the degree of grain rotation and allows cracks to extend into the ferrite in an inclined manner, maximising the deformability of the material.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"192 ","pages":"Article 104435"},"PeriodicalIF":12.8,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144737725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}