International Journal of Plasticity最新文献

{"title":"Crystal plasticity modeling and data–driven approach for fatigue life estimation of additively manufactured Ti-6Al-4V alloy","authors":"Kushagra Tiwari, Aayush Trivedi, G. Bharat Reddy, Bhupendra K. Kumawat, Akhil Bhardwaj, R.K. Singh Raman, Rhys Jones, Alankar Alankar","doi":"10.1016/j.ijplas.2025.104319","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104319","url":null,"abstract":"The limited use of additively manufactured Ti-6Al-4V (AM Ti64) alloy in critical load–bearing applications stems from an incomplete understanding of its fatigue behaviour, the underlying causes and mechanisms, and the absence of reliable predictive modeling. This study aims to bridge this gap by attempting to aid a microstructure–sensitive modeling with the number of cycles to failure. Low cycle fatigue (LCF) tests are performed to failure at room temperature with five different strain amplitudes, with cyclic softening noted in all tests. A crystal plasticity model is developed and used for analyzing the fatigue indicator parameters (FIPs). Synthetic microstructures that statistically resemble the experimentally observed microstructure obtained using Electron Backscatter Diffraction (EBSD), are used. Grain–averaged and Band–averaged Fatemi–Socie FIPs are employed to evaluate the likelihood of crack initiation. These FIPs are derived from the output of CPFE model and volume–averaged for each strain amplitude. Following the elastic–plastic shakedown, the highest 5% of volume–averaged FIPs are analyzed using a Gumbel extreme value distribution. A Bayesian inference approach is used to associate the Gumbel distribution’s characteristics of FIPs with fatigue life, demonstrating a strong correlation with the experimental data on fatigue life. This work shows that a consistent correlation between FIPs and the number of cycles to failure can be established, offering a predictive tool for fatigue life assessment.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"25 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806251","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":"High-strain-rate mechanical constitutive modeling with computational parameters","authors":"Mingyu Lei, Jie Huang, Yanxian Li, Liqiang Zhang, Guochun Yang, Bin Wen","doi":"10.1016/j.ijplas.2025.104329","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104329","url":null,"abstract":"Mechanical constitutive relationships characterize the strain response of materials under external loading, laying the foundation for optimizing material performance and guiding engineering design. However, existing modeling methods for mechanical constitutive relationships, especially for high strain rate (HSR) loading, often rely on fitted experimental data and fail to comprehensively capture the underlying physical mechanisms. In this work, we propose a mechanical constitutive modeling with computational parameters (MCMCP) method suitable for HSR loading conditions, which establishes a quantitative link between the microstructure of materials and their macroscopic mechanical properties by fully integrating fundamental physical principles. This method couples the thermally activated dislocation unpinning mechanism with the phonon drag effect to accurately describe dislocation velocity and the influence of strain rate on plastic behavior. Additionally, a multi-mechanism coordinated strength-solving framework is introduced. It predicts the slip-twinning transition and quantitatively evaluates the contributions of various strengthening mechanisms. By incorporating microstructural evolution information, the material's flow stress-strain response can also be predicted. Validation against simulations of pure metals and alloys confirms the effectiveness of the proposed method. This work not only enhances the understanding of micro-scale physical mechanisms for mechanical behavior but also provides a practical tool for predicting the mechanical properties under HSR loading.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"21 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806252","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":"Ultra-high Strength, Deformable Nanocrystalline Al-Pd Alloys","authors":"X.Y. Sheng, Z.X. Shang, Y.F. Zhang, K. Xu, N.A. Richter, A.Y. Shang, H. Wang, X. Zhang","doi":"10.1016/j.ijplas.2025.104330","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104330","url":null,"abstract":"Strengthening of aluminum (Al) alloys is commonly achieved through precipitation by ageing. However, achieving well dispersed fine precipitates requires a meticulous heat treatment schedule. Here we report sputter-deposited nanocrystalline Al-Pd alloy with nanolaminates, mimicking the structure of vertically aligned nanocomposite (VAN). The nanolaminate consists of alternating Al-Pd solid solution and Al₄Pd intermetallic phase. The periodic composition fluctuation suggests the occurrence of spinodal decomposition. The Al-12.4Pd alloy exhibits a high flow stress of 2.2 GPa with significant work hardening ability, as evidenced by <em>in situ</em> micropillar compression tests performed in a scanning electron microscope. The unique VAN structure induced strengthening and deformation mechanisms are discussed. This study offers a fresh perspective for the design of high-strength deformable Al alloys.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"6 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806250","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":"Investigating the correlation between mechanical properties and gradient microstructures in laser shock peened CrCoNi alloy","authors":"Gangting Wang, Sangyu Luo, Yansong Guo, Ruizhe Huang, Chenguang Wang, Zhaoliang Qu","doi":"10.1016/j.ijplas.2025.104331","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104331","url":null,"abstract":"In this study, laser shock processing (LSP) was used to enhance the mechanical properties of CrCoNi medium-entropy alloys (MEAs) by introducing the gradient microstructures (GS) within the material. Extensive microstructural characterizations confirmed a progressive distribution of nanocrystalline grains, dislocations, and deformation twins along the material's depth. Quantitative measurements of microstructural parameters at varying depths were conducted. Near the surface, the predominant microstructural evolutions were high dislocation density, twins, and grain refinement. At deeper regions, the key behaviors were nanoscale grain refinement and twin collisions. Nanoindentation and micro-pillar compression tests were employed to characterize the hardness distribution and mechanical properties at the microscale. It was found that LSP significantly improved hardness and yield strength. A quantitative relationship between GS and mechanical properties was developed, with theoretical calculations showing good agreement with experimental results. The contributions of different microstructural evolutions to hardness were individually assessed, revealing that multi-stage twins and grain refinement were the primary strengthening factors after one and ten impacts, respectively.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"59 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143806249","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 cross-scale rheology of amorphous system and the resultant Turing-like patterns","authors":"X.C. Tang ,&nbsp;J.R. Deng ,&nbsp;L.Y. Meng ,&nbsp;X.H. Yao","doi":"10.1016/j.ijplas.2025.104323","DOIUrl":"10.1016/j.ijplas.2025.104323","url":null,"abstract":"<div><div>The cross-scale rheology of amorphous systems raises a number of problems in the fields of materials science and soft condensed matter physics about their fundamental physical principles. Nevertheless, a clear and concise theoretical framework is still lacking to elucidate the process from microscopic plastic events to the coalescence of shear transformation zones, and subsequently from mesoscopic slip line networks to the emergence of multi-level shear bands. This paper proposes an approach for tracking the activation of plastic events and the growth of plastic zones in amorphous alloys using clustering algorithms. The role of the plastic zone affected zones in the system’s percolation process is described using the Eshelby’s equivalent inclusion theory and the Grady–Kipp momentum diffusion theory, which offers a novel perspective on the mechanism of spontaneous symmetry breaking in amorphous systems with external force. Meanwhile, our research suggests that the cross-scale amorphous rheology is consistent with the fundamental characteristics of Turing patterns to some extent and can be abstracted as a reaction–diffusion system. The stress concentration and stress relaxation caused by plastic zone affected zones function as the activator and the inhibitor in Turing’s framework, respectively. We advocate for additional in-depth research and conceptual innovation to achieve disordered material design in multiple scales.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"189 ","pages":"Article 104323"},"PeriodicalIF":9.4,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797610","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":"Modeling of nonlinear viscoelastic-viscoplastic behavior of glassy polymers based on intramolecular rotation of molecular chains","authors":"Yoshiteru Aoyagi, Louis Narita Camboulives","doi":"10.1016/j.ijplas.2025.104328","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104328","url":null,"abstract":"In recent years, there has been progress in the development of constitutive models for reproducing the mechanical properties of glassy polymers, but there are limitations to conventional models, such as increased complexity and the number of material parameters. In this study, a new model was proposed to describe the nonlinear viscoelastic-viscoplastic behavior under loading, unloading, and cyclic loading conditions at temperatures below the glass transition temperature. The anelastic strain was considered in addition to elastic strain and plastic strain, which is based on three states: a stable state, a metastable state in tension, and a metastable state in compression. The numerical results obtained with the present model were compared with those obtained with the latest existing model and with the experimental results to investigate the ability to model both viscoelasticity and viscoplasticity. The proposed model stands out for its capacity to predict nonlinear viscoelasticity and viscoplasticity for various loading conditions with only simple thermal activation processes. The 22 material parameters required are fewer than those of recent models used for comparison. This is because the proposed model expresses the viscoelastic phenomena during loading and unloading in a unified manner.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"183 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143797745","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":"Hydrogen and Hydride Induced Stress Localization in Single Phase HCP and Dual Phase HCP-BCC Alloys","authors":"Masoud Taherijam, Hamidreza Abdolvand","doi":"10.1016/j.ijplas.2025.104325","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104325","url":null,"abstract":"Hydrogen partitioning and hydride-induced stress localization are important factors in the degradation of dual-phase alloys. This study investigates these mechanisms by developing a crystal plasticity finite element (CPFE) model that incorporates the two-way interaction between stress and hydrogen concentration. The model considers the effects of hydrogen induced lattice expansion (HILE), phase-dependent hydrogen partitioning, and the transformation strain induced by hydride precipitation. Using this model, the impact of hydrogen on stress distribution and hydride precipitation is examined both in single and dual-phase zirconium alloys with hexagonal close-packed (HCP) and body-centered cubic (BCC) crystals. The results of the model for hydride precipitation are compared with those measured by high-spatial resolution electron backscatter diffraction (EBSD). The findings reveal that HILE effects are more pronounced in dual-phase HCP-BCC alloys due to partitioning of hydrogen between phases. The nonuniform distribution of hydrogen atoms leads to stress localization, which creates favorable conditions for hydride nucleation, particularly near the HCP-BCC interfaces. It is shown that the proposed numerical framework can identify which one of the neighbouring HCP grains is the corresponding parent grain of an intergranular hydride.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"12 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766637","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":"Stochastic Room Temperature Creep of 316L Stainless Steel","authors":"Samuel B. Inman, Kevin W. Garber, Andreas E. Robertson, Nathan K. Brown, Remi Dingreville, Brad L. Boyce","doi":"10.1016/j.ijplas.2025.104326","DOIUrl":"https://doi.org/10.1016/j.ijplas.2025.104326","url":null,"abstract":"The creep behavior of 316L stainless steel at room temperature was evaluated as a function of time and applied stress using a new high-throughput approach. Several common creep models were evaluated against the observations, leading to deeper analysis of a stress-dependent modified logarithmic creep model. Within this model, multiple sources of uncertainty were compared. Aleatoric stochastic variation between samples under nominally identical conditions was identified as the primary contributor to uncertainty in creep response. Under any particular set of conditions, the sample-to-sample variability in creep strain was as high as a factor of two, highlighting the engineering importance of characterizing large statistical datasets. The model's extrapolation capabilities were assessed by comparing predictions derived from calibration on partial, shorter-duration subsets of the data. These findings underscore the importance of accounting for stochastic effects in predictive modeling of aging phenomena.","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"38 1","pages":""},"PeriodicalIF":9.8,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766633","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":"Revealing the mechanism for enhancing the creep property by adding Ta/Zr elements in RAFM steel: Experimental and modeling study","authors":"Xiangyu Xie ,&nbsp;Chunliang Mao ,&nbsp;Chenxi Liu ,&nbsp;Junting Luo ,&nbsp;Yongchang Liu","doi":"10.1016/j.ijplas.2025.104313","DOIUrl":"10.1016/j.ijplas.2025.104313","url":null,"abstract":"<div><div>A continuum damage mechanics (CDM) creep model was developed based on the microstructure, which could precisely delineate the evolution of mobile dislocations, dipole dislocations, boundary dislocations, and martensitic laths in the RAFM steel during creep process. The addition of Ta/Zr elements promoted the precipitation of MX carbide particles, which could pin the mobile dislocations, and restrain the transformation of mobile dislocations into dipole dislocations, thereby slowing the decrease in statistically stored dislocation (SSD) density during creep. A large number of fine MX and M₂₃C₆ carbide particles sourcing from the addition of Ta/Zr elements could effectively delay the reduction in geometrically necessary dislocation (GND) density, and restrict GNDs transforming into sub-grain boundaries. By manipulating single-factor variables, the increase in precipitate damage factors strongly affected the steady creep stage and accelerated creep stage, especially for the precipitate damage factor of M₂₃C₆, which significantly accelerates the onset of the accelerated creep stage. The higher coarsening rate of M₂₃C₆ in RAFM steel without Ta/Zr was one of the reasons for its premature creep failure, as comparing with RAFM steel with Ta/Zr. During short-term (&lt; 1000 h) creep, fine Laves phase functions similarly to M₂₃C₆ particles, serving the purpose of precipitation strengthening. In the intermediate-term (&lt; 10,000 h) creep process, the Laves phase undergoes a certain degree of coarsening, but the coarsening-induced cavities damage is still not the primary cause of creep fracture. Thus, it was inferred that the depletion of W elements in the matrix sourcing from the coarsening of Laves phase is the main reason for the premature creep failure. In the intermediate-term creep of RAFM steel, the ability of Ta/Zr elements to significantly reduce the coarsening rate of Laves is a key factor for contributing to the significant extension of creep rupture time for RAFM steel.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"188 ","pages":"Article 104313"},"PeriodicalIF":9.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143760479","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":"Long-range internal stress from non-uniform geometrically necessary dislocations: A prediction method refined by dislocation dynamics simulations","authors":"Tao Zhang ,&nbsp;Shuang Xu ,&nbsp;Lisheng Liu ,&nbsp;Maoyuan Jiang","doi":"10.1016/j.ijplas.2025.104316","DOIUrl":"10.1016/j.ijplas.2025.104316","url":null,"abstract":"<div><div>The accumulation of geometrically necessary dislocations (GND) at grain boundaries is a primary source of long-range internal stress (LRIS) in polycrystals. The distribution of GNDs is typically inhomogeneous, and certain dislocation substructures with concentrated GNDs introduce a strong non-local effect. While many studies have explored the relationship between LRIS and the density of GNDs in polycrystals, few have discussed the influences of GND distribution patterns on LRIS calculations. This study employs dislocation dynamics (DD) simulations to investigate the LRIS of non-uniform GNDs confined within a grain boundary facet. First, the stress fields of three elementary types of GND bands with twist, tilt, and epitaxial dislocations are systematically analyzed using DD simulations. Considering the finite-size effect, scaling coefficients for recovering the LRIS around these GND bands are identified. Subsequently, non-uniform dislocation patterns are built to examine the distribution of LRIS at varying distances from grain boundary facets. In line with determining LRIS derived from an averaged surface GND density, an improved calculation method that accounts for the non-homogeneity of GNDs is developed. Finally, this method is applied to predict the LRIS of a set of GND facets with more complex dislocation patterns extracted from face-centered cubic grains. The predictions show good agreement with stress results computed by DD simulations, suggesting potential for further improvement of the dislocation density-based constitutive approach.</div></div>","PeriodicalId":340,"journal":{"name":"International Journal of Plasticity","volume":"188 ","pages":"Article 104316"},"PeriodicalIF":9.4,"publicationDate":"2025-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766634","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}