International Journal of Fatigue最新文献_第3页

Optimized tilted friction stir processing for fatigue improvement of steel butt-welded joints 优化倾斜搅拌摩擦工艺改善钢对接焊接接头的疲劳性能

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-10-01 DOI: 10.1016/j.ijfatigue.2025.109317

Feng Jiang , Yongshi Tang , Mikihito Hirohata , Yoshiaki Morisada , Muneaki Mukuda , Hidetoshi Fujii

{"title":"Optimized tilted friction stir processing for fatigue improvement of steel butt-welded joints","authors":"Feng Jiang , Yongshi Tang , Mikihito Hirohata , Yoshiaki Morisada , Muneaki Mukuda , Hidetoshi Fujii","doi":"10.1016/j.ijfatigue.2025.109317","DOIUrl":"10.1016/j.ijfatigue.2025.109317","url":null,"abstract":"<div><div>In welded joints of steel structures, stress concentrations caused by geometric discontinuities and tensile residual stresses strongly influence durability under cyclic loading. Friction stir processing (FSP) is increasingly recognized as an effective post‑weld treatment for enhancing joint integrity by refining microstructures and improving joint geometry. This study proposes a tilted friction stir processing (TFSP) configuration that uses a 9° tool tilt and places the advancing side near the weld toe to optimize microstructural refinement and fatigue performance in steel butt‑welded joints. TFSP was performed with a spherical‑tipped WC tool at 700 rpm and a traverse speed of 300 mm/min. Microstructural analysis, surface‑geometry characterization, Vickers hardness testing, and residual‑stress measurements were conducted. The results show that TFSP improved the microstructure at the weld toes, increased Vickers hardness in the heat‑affected zone (HAZ), and reduced residual stress. Four‑point bending fatigue tests, supported by finite element analysis (FEM), demonstrated that appropriately treated specimens achieved approximately twice the fatigue life of untreated welded specimens. These findings highlight TFSP as a practical and effective enhancement technique for structural steel weldments and clarify the mechanisms responsible for fatigue life improvement.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109317"},"PeriodicalIF":6.8,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268441","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

High-cycle fatigue properties of near-defect-free titanium alloy treated by additive manufacturing and hot-isostatic pressing at different temperatures 增材制造和热等静压处理近无缺陷钛合金在不同温度下的高周疲劳性能

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-30 DOI: 10.1016/j.ijfatigue.2025.109311

X.Y. Teng , J.C. Pang , X.H. Peng , H. Zhang , S.X. Li , Z.F. Zhang

{"title":"High-cycle fatigue properties of near-defect-free titanium alloy treated by additive manufacturing and hot-isostatic pressing at different temperatures","authors":"X.Y. Teng , J.C. Pang , X.H. Peng , H. Zhang , S.X. Li , Z.F. Zhang","doi":"10.1016/j.ijfatigue.2025.109311","DOIUrl":"10.1016/j.ijfatigue.2025.109311","url":null,"abstract":"<div><div>The fatigue properties of titanium alloys are often compromised by defects in processing technology, especially for additive manufacturing (AM). A near-defect-free Ti-6.5Al-3.5Mo-1.5Zr-0.3Si (TC11) alloy was fabricated by AM and hot isostatic pressing (HIP) process to investigate the effects of testing temperatures on tensile and fatigue properties of the AM TC11 alloy under defect-free conditions. Multi-scale characterization methods were used to reveal its damage mechanism in the microstructure. The results show that the tensile strength of the AM TC11 alloy decreases gradually with increasing testing temperature, while the work-hardening behavior is lost when the temperature is above 550 ℃. The fatigue strength at 500 ℃ is slightly higher than that at 400 ℃, mainly due to the dynamic evolution process of the microstructure caused by temperature and cyclic loading. Fatigue cracks were found to initiate at the coarse prior β gains boundaries (PBGBs) on the surface rather than the defects such as pores in the alloy after HIP. The variation relations of the mechanical properties of several titanium alloys at different temperatures were compared and discussed based on the general relation between tensile strength and fatigue strength of metallic materials.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109311"},"PeriodicalIF":6.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145268445","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

Study on the effect of 0.6 M NaCl solution on fatigue crack growth behavior of SLM-ed AlSi10Mg and A360 alloys 0.6 M NaCl溶液对SLM-ed AlSi10Mg和A360合金疲劳裂纹扩展行为的影响研究

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-30 DOI: 10.1016/j.ijfatigue.2025.109314

Hongqian Chen, Xuechong Ren, Xiaodi Wang, Peng Liu

{"title":"Study on the effect of 0.6 M NaCl solution on fatigue crack growth behavior of SLM-ed AlSi10Mg and A360 alloys","authors":"Hongqian Chen, Xuechong Ren, Xiaodi Wang, Peng Liu","doi":"10.1016/j.ijfatigue.2025.109314","DOIUrl":"10.1016/j.ijfatigue.2025.109314","url":null,"abstract":"<div><div>The fatigue crack growth (FCG) behaviors of SLMed-AlSi10Mg and A360 alloy were studied in both air and 0.6 M NaCl solution environments. Considering the anisotropic microstructure the fatigue crack growth curves were tested with three orientations for SLMed-AlSi10Mg. The results indicated that SLMed-AlSi10Mg exhibits higher FCG rates than A360 specimens when Δ<em>K</em> < 15 MPa·m<sup>1/2</sup> in air and Δ<em>K</em> < 11 MPa·m<sup>1/2</sup> in 0.6 M NaCl solution. The FCG rates of A360 specimens in 0.6 M NaCl solution was about one order higher than that in air, which was attributed to hydrogen assisted embrittlement. However, the FCG rates of SLM specimens were almost independent on both the solution environment and crack orientations. The fracture surface showed alternate coarse and fine facets, conforming with the fact that fatigue crack went through the molten boundary and center in turn. The low environment sensitivity of FCG rates for SLMed-AlSi10Mg may result from the similar effect of fine Si cells with hydrogen atoms in restraining the dislocation mobility.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109314"},"PeriodicalIF":6.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267415","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

Short crack behavior at deep and microstructurally shallow notches 短裂纹行为在深和微观结构上浅缺口

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-30 DOI: 10.1016/j.ijfatigue.2025.109313

Lukas Walch , Thomas Klünsner , Bernhard Sartory , Stefan Marsoner , Larissa Egger , Anton Hohenwarter , Harald Leitner , Reinhard Pippan , Gerald Ressel

{"title":"Short crack behavior at deep and microstructurally shallow notches","authors":"Lukas Walch , Thomas Klünsner , Bernhard Sartory , Stefan Marsoner , Larissa Egger , Anton Hohenwarter , Harald Leitner , Reinhard Pippan , Gerald Ressel","doi":"10.1016/j.ijfatigue.2025.109313","DOIUrl":"10.1016/j.ijfatigue.2025.109313","url":null,"abstract":"<div><div>Usually, fatigue crack propagation is experimentally characterized using cracks emanating from deep, through-specimen-width notches that average the crack’s propagation behavior over many microstructural features along the crack front. Such a deep and wide crack does not accurately represent the reality in most tools, where cracks typically emanate from small microstructural features, such as carbides or shallow notches at the surface. Therefore, the general applicability of conventionally obtained fatigue data on application-relevant short cracks was uncertain. Furthermore, by averaging local properties, the effect of microstructural features on the propagation behavior remained hidden. The current work addresses the open question of the validity of short crack fatigue data obtained on deep notches using a novel method to monitor the propagation of application-relevant, microstructurally small, and shallow cracks. The technique enables <em>in situ</em> measurement of microstructurally small cracks emanating from an artificial defect of application-relevant size near a small number of microstructural features by using the alternating-current potential drop method. The technique is demonstrated on the example of µm-sized semi-elliptical notches introduced via focused ion beam milling. Measured potential increases were correlated to fatigue crack extensions for the utilized material, signal current, and signal frequency combination. The short crack propagation behavior of microstructurally small cracks resembled that observed for short cracks in single-edge notched bending specimens. The results indicate that the short crack propagation behavior obtained on physically short but macroscopically deep cracks is also valid for application-relevant defect sizes for high-strength materials.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109313"},"PeriodicalIF":6.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217847","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

An integrated software tool for fatigue life prediction in large additive manufactured metallic structures under multi-axial loading 大型增材制造金属结构在多轴载荷下疲劳寿命预测集成软件工具

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-30 DOI: 10.1016/j.ijfatigue.2025.109289

Jana Christine Faes , Klaas Allaer , Nicolas Lammens , Wim Van Paepegem

{"title":"An integrated software tool for fatigue life prediction in large additive manufactured metallic structures under multi-axial loading","authors":"Jana Christine Faes , Klaas Allaer , Nicolas Lammens , Wim Van Paepegem","doi":"10.1016/j.ijfatigue.2025.109289","DOIUrl":"10.1016/j.ijfatigue.2025.109289","url":null,"abstract":"<div><div>Additive Manufacturing (AM) offers unprecedented design freedom but also introduces challenges for fatigue life prediction, including surface roughness variability, microstructural defects, and complex stress states. Conventional fatigue assessment methods, which rely on equivalent stress parameters and assume uniform surface conditions, often fall short when applied to AM components with intricate geometries and localized surface features. This work presents a fatigue post-processing framework that integrates three key modeling strategies: (i) the Modified Wöhler Curve Method for critical-plane-based multiaxial fatigue assessment, (ii) the Theory of Critical Distances to account for stress concentrations near geometric features, and (iii) surface-orientation-dependent material properties to reflect roughness variations induced by the build process. The post-processor operates on finite element (FE) results, supports large-scale three-dimensional meshes, and is applicable to metallic components in general, not limited to those produced by AM. The framework is demonstrated on a bearing housing produced by Laser Powder Bed Fusion in Ti–6Al–4V. The FE model comprises over one million quadratic tetrahedral elements, and the predicted fatigue life and crack initiation site show good agreement with experimental results. Total computation time remains under 50 min, despite the full-field critical-plane search and subsurface stress evaluation, making the tool practical for industrial use.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109289"},"PeriodicalIF":6.8,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267414","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

Synergistic effect of nano-size precipitations and dislocations on the strength and fatigue behavior of bainitic rail steel 纳米析出物和位错对贝氏体钢轨钢强度和疲劳性能的协同作用

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-29 DOI: 10.1016/j.ijfatigue.2025.109310

Z.J. Xie , L.Q. Bai , X.F. Lu , X.L. Wang , R.D.K. Misra , C.J. Shang

{"title":"Synergistic effect of nano-size precipitations and dislocations on the strength and fatigue behavior of bainitic rail steel","authors":"Z.J. Xie , L.Q. Bai , X.F. Lu , X.L. Wang , R.D.K. Misra , C.J. Shang","doi":"10.1016/j.ijfatigue.2025.109310","DOIUrl":"10.1016/j.ijfatigue.2025.109310","url":null,"abstract":"<div><div>This study examines the effect of tempering at 300–500 °C after forced-air cooling on fatigue properties of bainitic rail steel. Microstructural studies revealed that the specimens subjected to the four different heat treatments consisted of lath bainite and film-like retained austenite. The dislocation density for forced-air cooled, 300 °C, 400 °C, and 500 °C tempered conditions were 9.4 × 10<sup>14</sup> m<sup>−2</sup>, 7.9 × 10<sup>14</sup> m<sup>−2</sup>, 6.5 × 10<sup>14</sup> m<sup>−2</sup>, and 4.1 × 10<sup>14</sup> m<sup>−2</sup>, respectively. V(C,N) precipitates larger than 20 nm were primarily observed in the forced-air cooled steel, exhibited a unimodal size distribution with an average particle size of ∼ 25 nm. Tempering at 300 °C had minimal influence on the precipitation behavior. After tempering at 400 °C and 500 °C, new nano-size VC precipitates with an average particle size of 7.8 nm were observed, exhibiting a bimodal size distribution. At 400 °C, the strengthening effect of nano-size precipitates outweighs softening due to dislocation recovery, resulting in highest yield strength and fatigue limit. Fatigue fracture analysis revealed that the 500 °C tempered steel exhibited interior inclusion-induced crack initiation, while samples subjected to other heat treatments showed crack initiation from the surface or surface inclusions. Newly formed small grains were observed only at the crack initiation site induced by internal inclusions in the 500 °C tempered steel. This indicated that high-temperature tempering significantly reduced the dislocation density, which is detrimental to fatigue behavior. The optimal fatigue performance at 400 °C ascribed to the balanced synergy between moderate dislocation density and nano-precipitation. This finding provides new strategy to design bainitic rail steels with high fatigue property.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109310"},"PeriodicalIF":6.8,"publicationDate":"2025-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267412","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

Comparative study of slip activities and strain distribution in Ti6321 alloy with bimodal microstructure under dwell fatigue loadings 双峰组织Ti6321合金在疲劳载荷下滑移活动与应变分布的对比研究

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-27 DOI: 10.1016/j.ijfatigue.2025.109304

Wenyuan Zhang , Jiaxin Zhao , Jiangkun Fan , Runze Zhao , Zhixin Zhang , Peng Jiang , Bin Tang , Weiju Jia , Xiangyi Xue , Jinshan Li

{"title":"Comparative study of slip activities and strain distribution in Ti6321 alloy with bimodal microstructure under dwell fatigue loadings","authors":"Wenyuan Zhang , Jiaxin Zhao , Jiangkun Fan , Runze Zhao , Zhixin Zhang , Peng Jiang , Bin Tang , Weiju Jia , Xiangyi Xue , Jinshan Li","doi":"10.1016/j.ijfatigue.2025.109304","DOIUrl":"10.1016/j.ijfatigue.2025.109304","url":null,"abstract":"<div><div>Near-α titanium alloys are known to be susceptible to dwell fatigue debit, which has been linked to microstructure and the microscale slip deformation localization. However, prior research has predominantly focused on primary α (α<sub>p</sub>) microstructures, leaving a critical gap in systematic investigations of bimodal microstructures, which are of greater engineering relevance. This study systematically investigates slip activation mechanisms in Ti6321 alloy under pure fatigue and dwell-fatigue loading through integrated slip trace analysis and high-resolution digital image correlation (HR-DIC), focusing on α<sub>p</sub> and secondary α (α<sub>s</sub>) colony in transformed β (β<sub>t</sub>) microstructures. Key findings revealed that dwell-fatigue conditions significantly enhance basal and prismatic slip activation compared to pure fatigue, elevating plastic strain localization within slip bands. Hexagonal close-packed (HCP) elastic anisotropy and the superior strain rate sensitivity (SRS) of basal slips drive preferential activation across both hard- and soft-oriented regions, while prismatic slips exhibit sustained strain accumulation due to lower strain hardening. Furthermore, comparing to the α<sub>p,</sub> analysis demonstrates that α<sub>s</sub> colony prevent long-range slip through strain dispersion at interface, reducing dwell sensitivity. These results provide crystallographic insights into the mechanistic linkage between dwell fatigue effects and slip-mediated deformation, offering critical guidance for microstructure-informed alloy design and crystal plasticity model calibration.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109304"},"PeriodicalIF":6.8,"publicationDate":"2025-09-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217846","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

Microstructure-sensitive crystal plasticity and fatigue indicator modeling for LZ50 steel LZ50钢显微组织敏感晶体塑性及疲劳指标建模

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-25 DOI: 10.1016/j.ijfatigue.2025.109302

Shuwei Zhou , Mian Huang , Christian Häffner , Sophie Stebner , Min Cai , Zhichao Wei , Bing Yang , Sebastian Münstermann

{"title":"Microstructure-sensitive crystal plasticity and fatigue indicator modeling for LZ50 steel","authors":"Shuwei Zhou , Mian Huang , Christian Häffner , Sophie Stebner , Min Cai , Zhichao Wei , Bing Yang , Sebastian Münstermann","doi":"10.1016/j.ijfatigue.2025.109302","DOIUrl":"10.1016/j.ijfatigue.2025.109302","url":null,"abstract":"<div><div>The fatigue performance of railway axle steel is highly sensitive to microstructural heterogeneities and internal defects, which are inadequately captured by conventional life prediction methods. Motivated by this, a two-stage fatigue life prediction framework for LZ50 steel is employed that integrates the crystal plasticity finite element method with fatigue indicator parameters to account for microstructure-sensitive fatigue processes, including crack initiation and microstructurally short crack growth. To establish a typical experimental foundation, microstructural characterization via electron backscatter diffraction and scanning electron microscopy, displacement-controlled uniaxial tensile tests, and strain-controlled fatigue experiments were conducted. Representative volume elements were constructed based on the characterized microstructures, and crystal plasticity parameters were calibrated against both tensile and fatigue test results obtained at a strain amplitude of 0.9%, and further validated at amplitudes of 0.45%, 0.6%, and 0.75%. Compared to the approaches based on conventional fatigue indicator parameters, the two-stage framework that decouples crack initiation and microstructurally short-crack growth significantly improves prediction accuracy, with all results falling within the <span><math><mrow><mo>±</mo><mn>1</mn><mo>.</mo><mn>5</mn><mo>×</mo></mrow></math></span> scatter band. The microstructurally short crack growth stage is found to contribute more than 50% of the total fatigue life. Furthermore, the effects of inclusions and pores with varying size, shape, and stiffness are systematically investigated. This study provides an effective and physically grounded framework for fatigue life prediction of defect-containing microstructures in structural steels.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109302"},"PeriodicalIF":6.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155829","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 fatigue life prediction framework for CFRP/Al hybrid (riveted/bonded) joints and bonded joints under hygrothermal-load conditions based on physics-guided machine learning 基于物理引导机器学习的CFRP/Al复合（铆接/粘接）接头和粘接接头湿热载荷下疲劳寿命预测框架

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-25 DOI: 10.1016/j.ijfatigue.2025.109306

Yacong Zhang , Zhao Liu , Ping Zhu

{"title":"A fatigue life prediction framework for CFRP/Al hybrid (riveted/bonded) joints and bonded joints under hygrothermal-load conditions based on physics-guided machine learning","authors":"Yacong Zhang , Zhao Liu , Ping Zhu","doi":"10.1016/j.ijfatigue.2025.109306","DOIUrl":"10.1016/j.ijfatigue.2025.109306","url":null,"abstract":"<div><div>The widespread use of lightweight materials has presented challenges in dissimilar material joining technologies. Hybrid (riveted/bonded) joints (HJs) and bonded joints (BJs), common in carbon fiber reinforced polymer/aluminum alloy (CFRP/Al) structures, exhibit favorable fatigue performance. However, the coupling of hygrothermal conditions and mechanical loads complicates fatigue failure mechanisms. Fatigue life prediction remains difficult due to limited experimental data, multiphysics coupling, and pronounced nonlinearity. To address these issues, this study proposes a physics-guided machine learning (PGML) framework. A hygrothermal fatigue experiment was conducted to construct a dataset and to develop a nonlinear damage accumulation model that accounts for both hygrothermal and load effects. Guided by this model, a residual neural network was designed to correct systematic prediction errors, combining the strengths of physics and machine learning. The approach achieved an <em>R</em><sup>2</sup> of 0.97, with most predictions falling within 2 times error band. Sensitivity analysis revealed feature contributions across different structures and indicated directions for improving the physical model. The PGML framework developed in this study enables efficient and accurate fatigue life prediction for CFRP/Al joints under hygrothermal-load coupling conditions and provides an extensible methodology for related fatigue life prediction problems.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109306"},"PeriodicalIF":6.8,"publicationDate":"2025-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145217845","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

An improved constitutive model based on two-surface theory considering strain-amplitude and loading-history dependence 一种考虑应变幅值和加载历史依赖性的改进双曲面本构模型

IF 6.8 2区材料科学

International Journal of Fatigue Pub Date : 2025-09-24 DOI: 10.1016/j.ijfatigue.2025.109290

Shuai Zheng

{"title":"An improved constitutive model based on two-surface theory considering strain-amplitude and loading-history dependence","authors":"Shuai Zheng","doi":"10.1016/j.ijfatigue.2025.109290","DOIUrl":"10.1016/j.ijfatigue.2025.109290","url":null,"abstract":"<div><div>The mechanical behaviors of austenitic stainless steel S31608 were investigated under monotonic tensile and cyclic loading conditions with a wide range of strain amplitudes. Results indicated that it represented unsaturated long-range cyclic softening/hardening before fracture, pronounced strain-amplitude and loading-history dependence. First, the framework of combined hardening was applied to the experimental data to study the variations in a series of plastic state variables, including the elastic modulus and plastic hardening characteristics. Secondly, building on these insights, a comprehensive constitutive model was developed based on two-surface theory, consisting of a yield surface and boundary surface. Novel nonlinear isotropic and kinematic hardening rules were proposed to incorporate the complex properties mentioned above. Four major mechanisms of boundary evolution were proposed to reflect the influences of strain range and loading protocol. Finally, to benchmark the model’s predictive capability, the proposed model alongside the Updated Voce-Chaboche (UVC) model, YU model, and He model were implemented and compared their predictions against test results. The comparison results demonstrated that the complicated mechanical properties were beyond the ability of the UVC model. In contrast, the proposed model precisely predicted both stress evolution and the hysteretic loop shape change of S31608 under various loading schemes, achieving a narrow error band within ± 8 %.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"203 ","pages":"Article 109290"},"PeriodicalIF":6.8,"publicationDate":"2025-09-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145155827","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