International Journal of Fatigue最新文献_第10页

A new fatigue life prediction method for welded joints based on machine learning incorporating defect information and physics of failure 结合缺陷信息和失效物理的基于机器学习的焊接接头疲劳寿命预测方法

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-11 DOI: 10.1016/j.ijfatigue.2025.109234

Mengqi Liu , Xiaogang Wang , Dong Mi , Zhicheng Liu , Xiangyun Long , Shengming Wen , Chao Jiang

{"title":"A new fatigue life prediction method for welded joints based on machine learning incorporating defect information and physics of failure","authors":"Mengqi Liu , Xiaogang Wang , Dong Mi , Zhicheng Liu , Xiangyun Long , Shengming Wen , Chao Jiang","doi":"10.1016/j.ijfatigue.2025.109234","DOIUrl":"10.1016/j.ijfatigue.2025.109234","url":null,"abstract":"<div><div>This study is dedicated to establishing a new fatigue life prediction model for welded joints that comprehensively considers the effect of welding defects and the physical mechanism of fatigue failure. Firstly, an improved fatigue model for welded joints based on damage tolerance concept is proposed, in which fatigue-critical factors such as the geometric characteristics and location of welding defects are fully considered. Secondly, the proposed physical model is incorporated into a popular machine learning approach of support vector regression (SVR) that is suitable for training fatigue test data, such that a physics-guided artificial intelligence (AI) method is established. The developed method was then applied to predict the fatigue life of welded joints of GH4169 nickel-based superalloy under different fatigue testing conditions at high temperatures. The experimental results show that the life prediction accuracy of the proposed physics-integrated SVR method is significantly higher than that of purely physics-based or purely data-driven methods. Moreover, the proposed method also exhibits better prediction capacity and applicability compared with other physics-AI hybrid methods for fatigue assessment of defect-containing welded joints. This is supported by the fatigue mechanism confirmed by fractographic analysis, demonstrating the promising potential of this physics-integrated AI approach in fatigue life prediction.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109234"},"PeriodicalIF":6.8,"publicationDate":"2025-08-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852131","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Critical role of {11–21} twinning in fatigue crack initiation in zirconium {11-21}孪晶在锆疲劳裂纹萌生中的关键作用

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-10 DOI: 10.1016/j.ijfatigue.2025.109232

Qing Jiang , Yao Chen , Fulin Liu , Lang Li , Chao He , Hong Zhang , Chong Wang , Yongjie Liu , Qiang Chen , Qingyuan Wang

{"title":"Critical role of {11–21} twinning in fatigue crack initiation in zirconium","authors":"Qing Jiang , Yao Chen , Fulin Liu , Lang Li , Chao He , Hong Zhang , Chong Wang , Yongjie Liu , Qiang Chen , Qingyuan Wang","doi":"10.1016/j.ijfatigue.2025.109232","DOIUrl":"10.1016/j.ijfatigue.2025.109232","url":null,"abstract":"<div><div>Zirconium metals, widely employed in nuclear reactor applications, are susceptible to flow-induced vibrations, facing a critical challenge to fatigue fracture. This study systematically investigates crack initiation mechanism in Zirconium under cyclic loading. It is found that although prismatic slip dominates as the primary deformation mode, crack initiation is predominantly governed by {11–21} deformation twinning. Due to the twinning polarity during cyclic loading, the activation of {11–21} twinning occurs near two critical peak angles: 27° or 62° (the angle between the <em>c</em>-axis of the parent grains and the loading axis). Subsequently, a significant difference in Schmid factors for prismatic slip develops between the parent grain and the twinned region. As a result, the activated prismatic slips can hardly move across the twinning boundaries, leading to localized strain accumulation and crack nucleation at twin interfaces. These findings highlight a twin-boundary-dominated crack initiation mechanism in Zirconium during fatigue.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109232"},"PeriodicalIF":6.8,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828448","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Residual stress relief effect in gradient structural steel and remaining life evaluation under stochastic fatigue loads 随机疲劳荷载下梯度结构钢残余应力消除效应及剩余寿命评估

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-10 DOI: 10.1016/j.ijfatigue.2025.109233

Tianyu Qin , Feifei Hu , Pingguang Xu , Rui Zhang , Yuhua Su , Ni Ao , Zhongwen Li , Takenao Shinohara , Takahisa Shobu , Shengchuan Wu

{"title":"Residual stress relief effect in gradient structural steel and remaining life evaluation under stochastic fatigue loads","authors":"Tianyu Qin , Feifei Hu , Pingguang Xu , Rui Zhang , Yuhua Su , Ni Ao , Zhongwen Li , Takenao Shinohara , Takahisa Shobu , Shengchuan Wu","doi":"10.1016/j.ijfatigue.2025.109233","DOIUrl":"10.1016/j.ijfatigue.2025.109233","url":null,"abstract":"<div><div>The surface induction-hardened S38C medium carbon steel shows a good balance of strength and toughness, but complicates the evaluation of fatigue resistance, mainly because of gradient residual stress (RS) and grains. An integrated fatigue resistance assessment (AIFA) framework was proposed to consider the residual stress relief under stochastic loads. To this end, quasi-<em>in situ</em> neutron diffraction and Bragg-edge imaging were combined to probe the evolution of residual stress during crack propagation. Firstly, a rigid-flexible coupled vehicle dynamics model was adopted to obtain the time-domain variable amplitude loading spectrum. Then, Fortran subroutines were developed to assign these data into full-scale S38C axle model, and the remaining life was predicted using the damage tolerance approach. The results demonstrate that crack propagation would accelerate when residual stress is considered in the case of the crack depth exceeding 3.0 mm. It is, for the first time, found that 15 mm- and 5 mm-thickness fan-shaped specimens can retain the axial and hoop residual strain in terms of diffraction angle variation, respectively, for full-scale structural S38C steel axles. In the absence of RS, the remaining life of the axle decreases sharply from 624,800 to 51,300 km as the crack depth increases from 3.0 to 16 mm. Compared with the standard method under constant amplitude loading without residual stress relief, the present AIFA method provides the more accurate but conservative fatigue life prediction.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109233"},"PeriodicalIF":6.8,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144842160","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A microcrack evolution-based fatigue damage model for assessment of laser-arc hybrid welded joints in TC4 titanium alloy 基于微裂纹演化的TC4钛合金激光电弧复合焊接接头疲劳损伤评估模型

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-10 DOI: 10.1016/j.ijfatigue.2025.109231

Shengbo Li , Qianli Liu , Haizhou Li , Wantong Wang , Rui Lu , Xingyi Ruan , Yaofu Wang , Yunfei Meng , Hui Chen

{"title":"A microcrack evolution-based fatigue damage model for assessment of laser-arc hybrid welded joints in TC4 titanium alloy","authors":"Shengbo Li , Qianli Liu , Haizhou Li , Wantong Wang , Rui Lu , Xingyi Ruan , Yaofu Wang , Yunfei Meng , Hui Chen","doi":"10.1016/j.ijfatigue.2025.109231","DOIUrl":"10.1016/j.ijfatigue.2025.109231","url":null,"abstract":"<div><div>High cycle fatigue (HCF) failure in titanium alloy welded structures is predominantly caused by microcrack initiation and propagation induced by microscopic defects during fatigue loading. In this work, an idealized microcrack density-balanced evolution system was employed to characterize microcrack evolution during fatigue loading, and a fatigue damage evolution model was proposed to assess damage progression and predict the fatigue life of TC4 laser-arc hybrid welded joints. Microcrack number density was selected as the damage characterization parameter. A finite element model of the welded joint was developed in ABAQUS, and the fatigue damage evolution process was simulated through the implementation of a user material subroutine (UMAT). The cycle jumping technique was simultaneously employed to substantially decrease computational cost while preserving accuracy. This work adopted the aforementioned method to propose a HCF damage model for welded joints featuring parallel macro-microscale development. Fatigue experimental validation demonstrated good agreement between experimental data and simulation results, with the experimental fatigue life data predominantly lying within the twofold error band of the predicted values.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109231"},"PeriodicalIF":6.8,"publicationDate":"2025-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144828449","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In-situ fatigue crack detection and monitoring in A high-frequency resonance-dwell fatigue test using digital image correlation 基于数字图像相关的高频共振-驻留疲劳试验的原位疲劳裂纹检测与监测

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-07 DOI: 10.1016/j.ijfatigue.2025.109229

Brandon A. Furman, Jeffrey M. Wagner, Jacob B. Heninger, Tate T. Adams, Ryan B. Berke

{"title":"In-situ fatigue crack detection and monitoring in A high-frequency resonance-dwell fatigue test using digital image correlation","authors":"Brandon A. Furman, Jeffrey M. Wagner, Jacob B. Heninger, Tate T. Adams, Ryan B. Berke","doi":"10.1016/j.ijfatigue.2025.109229","DOIUrl":"10.1016/j.ijfatigue.2025.109229","url":null,"abstract":"<div><div>Resonance-dwell fatigue tests represent a rapid way to accumulate fatigue damage in a specimen. These tests utilize the structural resonances of an assembly to generate large strains at high frequencies using relatively modest input forces. Historically, damage in resonance-dwell fatigue tests has been assessed using metrics based on the natural frequency of the assembly. As damage accumulates, the natural frequency decreases due to a loss in stiffness. This approach to crack detection is somewhat problematic, however, as it can only be reliably used to determine whether damage exists; not the extent of the damage. In this work, digital image correlation is used in lieu of frequency-based metrics to provide a more comprehensive view of how damage evolves in a resonance-dwell, high-cycle fatigue test. Towards this end, a multiply-cracked beam theory model is developed to describe how crack formation impacts the out-of-plane displacement of a continuous-radii specimen. The beam theory model provides a set of basis functions that can be put in the form of a separable nonlinear least squares regression problem, thereby reducing it to a minimization problem in two variables for each crack in the specimen. Using this model, crack depth is estimated by application of the regression model to full-field displacement measurements taken during fatigue tests. Finally, the crack depth estimates resulting from the regression model are validated using post-mortem computed tomography scans of the specimens.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109229"},"PeriodicalIF":6.8,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144892963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using marker bands in additively manufactured Ti-6Al-4V to measure small fatigue crack growth rates and equivalent initial damage sizes 利用增材制造Ti-6Al-4V的标记带测量小疲劳裂纹扩展速率和等效初始损伤尺寸

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-06 DOI: 10.1016/j.ijfatigue.2025.109224

Christopher Bodger , Ben Main , Jireh Choi , Isaac Field , Simon Barter

{"title":"Using marker bands in additively manufactured Ti-6Al-4V to measure small fatigue crack growth rates and equivalent initial damage sizes","authors":"Christopher Bodger , Ben Main , Jireh Choi , Isaac Field , Simon Barter","doi":"10.1016/j.ijfatigue.2025.109224","DOIUrl":"10.1016/j.ijfatigue.2025.109224","url":null,"abstract":"<div><div>Additive manufactured (AM) structural parts are being increasingly used within Defence platforms across all domains. In the air domain, it is necessary to correctly validate the durability and damage tolerance analysis tools used for certification and sustainment of AM parts. This is emphasised by MIL‑STD‑1530Dc1 and the United States Air Force structures bulletin EZ‑SB‑19‑001. One difficulty with this is that AM production processes are known to lead to multiple different types of discontinuities which can nucleate fatigue cracks. Depending on the size of these discontinuities, they have the potential to significantly reduce the fatigue life of the AM part.</div><div>The focus of this work is on demonstrating the viability of using marker bands to assist with obtaining both crack growth curves and small crack growth rate data and equivalent initial damage size distributions for AM Ti‑6Al-4V. This technique has previously been used successfully in many wrought aluminium components and full-scale tests. The work here showed that it was possible to design effective marker bands for AM Ti‑6Al‑4V. It is judged that further development of this technique would assist with correlating durability and damage tolerance tools used in the certification of this material.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109224"},"PeriodicalIF":6.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144842161","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Three-dimensional mapping of residual stresses and crack propagation in refill friction stir spot welded aluminium samples via synchrotron X-ray diffraction and X-ray micro-computed tomography 利用同步加速器x射线衍射和x射线微计算机断层扫描技术对铝搅拌摩擦点焊试样的残余应力和裂纹扩展进行三维映射

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-06 DOI: 10.1016/j.ijfatigue.2025.109223

Matteo Bernardi , David Canelo-Yubero , Ting Chen , Uceu F.H. Suhuddin , Luciano Bergmann , Benjamin Klusemann

{"title":"Three-dimensional mapping of residual stresses and crack propagation in refill friction stir spot welded aluminium samples via synchrotron X-ray diffraction and X-ray micro-computed tomography","authors":"Matteo Bernardi , David Canelo-Yubero , Ting Chen , Uceu F.H. Suhuddin , Luciano Bergmann , Benjamin Klusemann","doi":"10.1016/j.ijfatigue.2025.109223","DOIUrl":"10.1016/j.ijfatigue.2025.109223","url":null,"abstract":"<div><div>Refill Friction Stir Spot Welding (refill FSSW) shows strong potential to replace riveting in the aerospace industry. However, the complex deformation and thermal effects associated with this process lead to residual stresses that may influence the fatigue life of the joint. This study reveals for the first time the non-uniform residual stresses across the thickness of a refill FSSW aluminium joint using synchrotron X-ray radiation in combination with a conical slit cell. Clear differences can be observed in the stresses between the region subjected to plasticisation and that affected solely by heat input. A fatigue testing campaign on the aluminium joints demonstrated their high reproducibility and robustness. X-ray micro-computed tomography enabled the three-dimensional visualisation of fatigue crack nucleation and propagation morphology, the latter correlated with the tensile residual stresses in the weld area. The results can contribute to the development of more accurate fatigue life prediction models and improve the overall reliability of refill FSSW aluminium joints in engineering applications.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109223"},"PeriodicalIF":6.8,"publicationDate":"2025-08-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144852064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controllable data augmentation and application of multiaxial fatigue experiments by fatigue conditional generative adversative network model 疲劳条件生成逆向网络模型在多轴疲劳实验中的可控数据增强及应用

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-05 DOI: 10.1016/j.ijfatigue.2025.109216

Wanqi Yu , Xingyue Sun , Zhen Yu , Xu Chen

{"title":"Controllable data augmentation and application of multiaxial fatigue experiments by fatigue conditional generative adversative network model","authors":"Wanqi Yu , Xingyue Sun , Zhen Yu , Xu Chen","doi":"10.1016/j.ijfatigue.2025.109216","DOIUrl":"10.1016/j.ijfatigue.2025.109216","url":null,"abstract":"<div><div>Multiaxial fatigue damage poses a significant threat to the reliability and safety of engineering components, while the scarcity of samples hinders the prediction performance of data-driven algorithms. To address this issue, a controllable fatigue conditional generative adversative network (FatCGAN) is proposed and validated with a series of 316L stainless steel data. With strain-controlled loading as conditional information and utilization of Wasserstein loss, the FatCGAN achieves efficient augmentation of stress response and fatigue life. The augmented samples show consistent distribution trends with experimental ones in qualitative and quantitative assessments. With the help of augmented samples, various data-driven models such as SVM, RF, XGBoost, ANN, CNN, and GRU have significantly improved prediction performance with reductions in <em>RMSE</em> by up to 46.2 %. The repeatability of the prediction results has also seen substantial improvement with the standard deviation reduced by up to 51.7 %. This approach offers a new solution for enhancing the training effects in small-sample scenarios.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109216"},"PeriodicalIF":6.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Empirical fatigue life model based on micro-CT defect severity indicator for laser powder-bed additively manufactured Ti-6Al-4V 基于微ct缺陷严重程度指示器的激光粉末床增材Ti-6Al-4V疲劳寿命经验模型

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-05 DOI: 10.1016/j.ijfatigue.2025.109213

Stephen Sun , Yi Rye Choi , Dina Bayoumy , Jonathan D Miller , Qianchu Liu

{"title":"Empirical fatigue life model based on micro-CT defect severity indicator for laser powder-bed additively manufactured Ti-6Al-4V","authors":"Stephen Sun , Yi Rye Choi , Dina Bayoumy , Jonathan D Miller , Qianchu Liu","doi":"10.1016/j.ijfatigue.2025.109213","DOIUrl":"10.1016/j.ijfatigue.2025.109213","url":null,"abstract":"<div><div>In high-criticality aerospace applications, the acceptance of additively manufactured (AM) Ti-6Al-4V components depends on overcoming the unpredictable fatigue performance caused by stochastic (random) process-induced lack-of-fusion (LOF) defects. This study aims to validate the detectability and accuracy of X-ray Micro Computed Tomography (µCT) data for assessing LOF defects and to develop a statistical-based empirical fatigue life model from the µCT data. The maximum defect severity indicator (DSI), based on defect size, geometry, and location from the µCT data, was used to determine detrimental defects and estimate fatigue life. Results show that µCT can characterize most detrimental LOF defects for laser powder-bed fusion process, but detection is challenging due to morphological characteristics. High spatial resolution is critical for LOF defect detection using µCT. The empirical model showed a high linear correlation between fatigue life and DSI when separating surface and internal LOF defects, providing a quick estimate of fatigue life from a µCT scan. However, further study is needed to address limitations, such as the specific µCT equipment used and the number of samples tested, and to determine the generalizability of the model to other AM materials and processes.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109213"},"PeriodicalIF":6.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144889189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Constitutive modeling and experimental analysis of asynchronous multiaxial fatigue in 304LN stainless steel using Bayesian optimization 基于贝叶斯优化的304LN不锈钢异步多轴疲劳本构建模与试验分析

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-08-05 DOI: 10.1016/j.ijfatigue.2025.109214

Surya P. Rao , S. Sivaprasad , H.N. Bar , Partha Pratim Dey

{"title":"Constitutive modeling and experimental analysis of asynchronous multiaxial fatigue in 304LN stainless steel using Bayesian optimization","authors":"Surya P. Rao , S. Sivaprasad , H.N. Bar , Partha Pratim Dey","doi":"10.1016/j.ijfatigue.2025.109214","DOIUrl":"10.1016/j.ijfatigue.2025.109214","url":null,"abstract":"<div><div>This study proposes a computational framework for modeling the multiaxial cyclic plasticity behavior of 304LN stainless steel under both synchronous and asynchronous strain-controlled loading. A series of biaxial fatigue experiments on thin-walled tubular specimens revealed pronounced nonproportional hardening and path-dependent plastic deformation, particularly under asynchronous loading conditions. To capture these effects, an advanced constitutive model was formulated by integrating multi-component kinematic hardening, a memory-dependent isotropic hardening rule, and a nonproportionality-sensitive internal variable. Model calibration was carried out using Bayesian Optimization, with kinematic hardening parameters trained on eighteen uniaxial hysteresis loops representative of various cyclic conditions to enhance the accuracy of simulated loop shapes. The finalized model was implemented in a finite element framework and validated across seven multiaxial loading paths. Simulations demonstrated high fidelity in reproducing hysteresis loop shapes, peak stresses, strain ranges, and stress path trajectories. Qualitative analysis indicates that asynchronous multiaxial loading in 304LN stainless steel results in elevated plastic strain accumulation and significant nonproportional hardening, effects that are closely associated with the newly introduced Desynchrony Index (DI). Experimental observations further demonstrate that asynchronous loading paths can produce cyclic hardening comparable to, or exceeding, that of classical out-of-phase loading, underscoring the importance of time-varying phase interactions in cyclic plasticity. The evolution of the nonproportionality parameter also shows strong agreement with experimentally derived desynchrony indices, reinforcing the robustness of the proposed approach for fatigue analysis under complex multiaxial loading conditions.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109214"},"PeriodicalIF":6.8,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0