International Journal of Fatigue最新文献

{"title":"Fatigue propagation behavior of multiple internal defects in 6082-T6 aluminum alloy joints: Experiments and numerical simulation","authors":"Hongliang Qian ,&nbsp;Zhihao Chen ,&nbsp;Yankai Wang ,&nbsp;Yong Liu ,&nbsp;Ping Wang","doi":"10.1016/j.ijfatigue.2025.109202","DOIUrl":"10.1016/j.ijfatigue.2025.109202","url":null,"abstract":"<div><div>Incomplete fusion defects within aluminum alloy joints formed during welding exhibit a multi-defect distribution, significantly affecting the fatigue behavior of the joints. This study systematically investigates the propagation behavior of single defect, the coalescence mechanism of coplanar defects, and the suppression effect of non-coplanar defects using FRANC3D, with a particular focus on the effects of defect shape, size, and spacing. The results indicate that internal defects evolve into a circular shape during cyclic loading. Defect coalescence accelerates crack propagation in the depth direction and shortens the fatigue life, as confirmed by microstructure analysis of the fracture surface. For coplanar defects with fixed spacing (<em>s</em> = 1 mm) and the size of defect 2 (<em>a</em>₂ = 0.5 mm), variations in the size of defect 1 do not alter the life distribution across different stages, with the life proportions spent in the pre-coalescence, coalescence, and post-coalescence being 65 %, 13 %, and 22 %, respectively. The suppression effect of non-coplanar defects results in a 20 % increase in fatigue life compared to larger single defect, although it remains lower than that of a smaller single defect.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109202"},"PeriodicalIF":6.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749433","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}

{"title":"Effect of thermo-mechanical treatment on the static and cyclic performance of cold sprayed 6061 aluminum alloy","authors":"Ahmad Nourian ,&nbsp;Ondrej Kovarik ,&nbsp;Jan Cizek ,&nbsp;Jaroslav Cech ,&nbsp;Shiyu Zhue ,&nbsp;Teichii Ando ,&nbsp;Sinan Müftü","doi":"10.1016/j.ijfatigue.2025.109197","DOIUrl":"10.1016/j.ijfatigue.2025.109197","url":null,"abstract":"<div><div>This paper investigates the influence of hot-rolling as a post-deposition treatment on the microstructure and mechanical properties of cold sprayed Al-6061 deposits prepared using nitrogen as the process gas. Various degrees of hot-rolling, followed by solution-aging heat treatment, were applied to enhance inter-particular bonding and improve mechanical performance. The treatment significantly densified the deposits and induced changes in the grain structure through static and dynamic recrystallization. Microhardness measurements, static tensile tests, uniaxial fatigue tests, fatigue crack growth rate tests, and fracture toughness assessments demonstrated notable improvements in the material strength, fatigue resistance, and crack growth behavior. The proposed approach will be effective for fabricating large-scale components with simple geometries. Additionally, it serves as a means to explore the upper bounds of microstructural and mechanical performance achievable in nitrogen-based cold sprayed deposits through extensive thermo-mechanical processing.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109197"},"PeriodicalIF":6.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720809","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}

{"title":"The relationship between the self-heating behavior and damage mechanism of carbon fiber/epoxy composites subjected to random vibration fatigue","authors":"Cong Zhang ,&nbsp;Yongzhi Li ,&nbsp;Guanchen Zhao ,&nbsp;Erming He","doi":"10.1016/j.ijfatigue.2025.109203","DOIUrl":"10.1016/j.ijfatigue.2025.109203","url":null,"abstract":"<div><div>Non-destructive thermal imaging-based internal damage identification and fatigue life assessment in composites necessitates investigating the relationship between the self-heating behavior and damage mechanisms. This study develops a novel self-heating numerical algorithm that categorizes temperature rise contributions into three components: (I) the viscoelastic deformation of composites, (II) interface debonding slip friction, and (III) delamination friction. The viscoelastic response of the composite was characterized by modifying the viscoelastic standard linear solid model, coupled with a damage model to investigate the temperature evolution of laminates during random vibration fatigue, and a series of verification experiments were carried out. Furthermore, the dynamic characteristics degradation patterns and damage-damping effect of composite laminates were explored in depth. The results demonstrated that temperature evolution significantly depends on the damage propagation; the viscoelastic deformation serves as the primary heat source driving the self-heating behavior of the composite, resulting in uniform thermal distribution within the region of interest. The internal damage modifies the relative contributions to temperature rise, thereby changing the surface thermal distribution of the composite. Dominant damage modes exhibit stage-dependent characteristics that differentially govern temperature evolution throughout the loading history. The developed self-heating model provides novel possibilities for accurate identification of internal damage and high-cycle fatigue life prediction in composite structures.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109203"},"PeriodicalIF":6.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724449","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}

{"title":"Enhancing high-temperature fatigue resistance in duplex titanium alloys via process-tailored boundary engineering","authors":"Yang Wang ,&nbsp;Xian-zhe Ran ,&nbsp;Hai Wang ,&nbsp;Xu Cheng ,&nbsp;Shao-yong Zhi ,&nbsp;Dong Liu ,&nbsp;Hua-ming Wang","doi":"10.1016/j.ijfatigue.2025.109195","DOIUrl":"10.1016/j.ijfatigue.2025.109195","url":null,"abstract":"<div><div>The development of high-temperature titanium alloys for aerospace propulsion systems requires good thermostability and fatigue resistance under high temperature loading conditions. This study comparatively investigated the microstructural characteristics and fatigue performance of Ti-6Al-4Zr-4Mo-2Sn-1W-0.2Si duplex titanium alloys fabricated respectively via laser-directed energy deposition additive manufacturing (AM) and conventional forging technologies. The results revealed that the forged titanium alloy contained fine grains with a heterogeneously duplex structure consisting of large-size near-spherical primary α and hard β_t phases. By contrast, the AMed titanium alloy contained columnar grains with an interior homogenous basketweave structure containing a few unstable high angle boundaries (HABs) and a high ratio of low angle boundaries (LABs). Although the room-temperature tensile strengths of two types of alloys were similar (∼1100 MPa), the AMed titanium alloy suggested superior high temperature mechanical properties with 8 % higher strength retention at 550 °C than the forged alloy (882 vs. 811 MPa). With an increase of total strain amplitude (Δ<em>ε_t</em>), the fatigue life of the specimen was prone to decreasing, associated with the declined texture intensity and activity of basal slip system of (0 0 0 1) [1 1 <span><math><mrow><mover><mrow><mn>2</mn></mrow><mrow><mo>¯</mo></mrow></mover><mspace></mspace></mrow></math></span>0]. Under the same Δ<em>ε_t</em> value of 0.6 %, the high temperature fatigue lives of the AMed alloys were 6–7 times longer than the forged counterparts. Fractographic analysis of the fatigue specimens revealed that surface slip cracking accompanied by oxide formation served as the predominant fatigue crack initiation mechanism, followed by striation patterns observed in crack propagation paths. Compared to the forged alloy, the higher fatigue properties of the AMed titanium alloy were mainly attributed to a higher thermostability and optimum microstructure design (fewer HABs and high ratio of LABs) resisting fatigue cracking. These findings offer a guide for the fabrication of next-generation titanium alloys requiring simultaneous high-temperature strength and fatigue resistance in aerospace applications.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109195"},"PeriodicalIF":6.8,"publicationDate":"2025-07-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757103","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}

{"title":"Damage and microstructure evolution for rolling contact fatigue of a CSS-42L gear steel under mixed lubrication","authors":"Hua-Zhen Jiang ,&nbsp;Jiajun Liu ,&nbsp;Zheng-Yang Li ,&nbsp;Jian Zhan ,&nbsp;Wenquan Cao ,&nbsp;Fuping Yuan ,&nbsp;Chengqi Sun","doi":"10.1016/j.ijfatigue.2025.109196","DOIUrl":"10.1016/j.ijfatigue.2025.109196","url":null,"abstract":"<div><div>In this study, a plasto-elastohydrodynamic lubrication model is employed to analyze the contact stress distribution in rolling contact fatigue (RCF) of a CSS-42L steel, which takes into account the effects of surface roughness and plastic deformation. Numerical simulation reveals that the maximum von Mises stress occurs at subsurface and it is not significantly affected by the presence of lubricating oil due to the relatively low surface roughness of the sample. The experiments are conducted under a mixed lubrication state, i.e., the hydrodynamic lubricant film and rough surface asperity contact coexists. Numerical analysis further indicates that the hydrodynamic lubricant film dominates the contact zone. It is supported by experimental observations that subsurface spalling pits are the main cause for the RCF failure in CSS-42L steel. In contrast, the oxidative wear damage from solid-solid asperity contact primarily leads to micro-pitting on the sample surface. Microstructure characterization indicates that the high-density carbide effectively impedes the RCF crack growth by influencing the path of crack propagation. The refinement of microstructure is also observed during the RCF, which is attributed to the cyclic plastic deformation caused by repetitive high contact stress.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109196"},"PeriodicalIF":6.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720806","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}

{"title":"An improved cyclic plastic model for carbide-free bainitic steel considering the influence of cyclic softening on ratcheting behavior","authors":"Xiang Xu ,&nbsp;Peilin Fu ,&nbsp;Jianping Zhao ,&nbsp;Xiaowei Wang ,&nbsp;Jianming Gong ,&nbsp;Guhui Gao ,&nbsp;Qianhua Kan","doi":"10.1016/j.ijfatigue.2025.109192","DOIUrl":"10.1016/j.ijfatigue.2025.109192","url":null,"abstract":"<div><div>The effect of cyclic softening on the ratcheting deformation of carbide-free bainitic (CFB) rail steel is investigated experimentally. To accurately describe the cyclic softening behavior of CFB steel, two superimposed softening coefficients are introduced into the kinematic hardening rule, providing a unified description of the transient Bauschinger effect and cyclic softening. The isotropic hardening rule is enhanced by incorporating Ohno’s memory surface, enabling a more accurate representation of strain amplitude-dependent cyclic softening during ratcheting deformation. Furthermore, a modified kinematic hardening rule based on the Abdel Karim–Ohno model is developed by integrating a logical-function-based ratcheting parameter to account for the additional stress level dependence on the ratcheting behavior of CFB rail steel. The comparison between simulated results and experimental results demonstrates that the proposed model can effectively capture both the cyclic softening and ratcheting behaviors of CFB rail steel under various loading levels, histories, and control modes.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109192"},"PeriodicalIF":5.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713068","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}

{"title":"Effect of hold time on dwell fatigue behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with equiaxed microstructure","authors":"Chao Fang ,&nbsp;Jianke Qiu ,&nbsp;Mingjie Zhang ,&nbsp;Lixin Liu ,&nbsp;Jiafeng Lei ,&nbsp;Rui Yang","doi":"10.1016/j.ijfatigue.2025.109194","DOIUrl":"10.1016/j.ijfatigue.2025.109194","url":null,"abstract":"<div><div>Dwell fatigue in titanium alloys has remained a persistent challenge to aero-engine safety for over five decades. In this work, in order to provide an adequate assessment of the dwell sensitivity of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with equiaxed microstructure, the effect of hold time on its dwell fatigue behavior was investigated. As the hold time increased, a saturation of fatigue life was observed. Small crack growth behavior during dwell fatigue failure was thought to be a critical factor responsible for this phenomenon. As the hold time increased, the crystallographic orientations of facets at the small crack growth regions evolved towards a harder orientation and eventually exhibited saturation, which consequently caused the small crack growth rate to level off. Whereas no difference in the orientations of the crack initiation facets was observed, as crack preferentially initiated from an α grain well-oriented for basal slip in the hard macrozone. Furthermore, according to the crystallographic orientations of the growth facets obtained directly from the fracture surfaces, a threshold range was defined to effectively identify effective structural units (ESUs) in alloy.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109194"},"PeriodicalIF":6.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720810","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}

{"title":"Multiscale modelling of additively manufactured Ti-6Al-4V alloy: Fatigue performance evaluation from material to structural level","authors":"Weiqian Chi ,&nbsp;Wenjing Wang ,&nbsp;Hongchang Zhou ,&nbsp;Ruiguo Yan ,&nbsp;Yoshiki Mikami","doi":"10.1016/j.ijfatigue.2025.109181","DOIUrl":"10.1016/j.ijfatigue.2025.109181","url":null,"abstract":"<div><div>Additively manufactured (AM) Ti-6Al-4V alloys face limitations in critical applications due to uncertainties in their fatigue performance. Despite extensive research on fatigue life prediction, the discrepancies in fatigue behaviour between AM structural components and material-level specimens remain poorly understood. In this study, the effect of hot isostatic pressing (HIP at 920 °C, 1000 bar Ar, 2 h) on the fatigue properties at both material and structural levels was investigated, aiming to bridge the gap in the cross-scale fatigue behaviour of AM Ti-6Al-4V alloys. Although HIP significantly improved microstructure and fatigue performance of material-level specimens, the presence of larger near-surface defects remained in the structural components, resulting in a poorer fatigue resistance. To quantitatively evaluate the impact of near-surface defects, a novel multiscale model for predicting fatigue behaviour of AM Ti-6Al-4V alloys was proposed. The model integrates finite element analysis with microstructural characteristics, where the grain boundaries (GBs) effect was quantified by the distance between GBs and the misorientations between adjacent grains. The input of this model requires only test conditions, tensile properties and microstructural information of the materials. The model was validated using <em>S-N</em> data from axial fatigue tests at both the material and structural levels, showing excellent correlation between predicted and experimental results. Overall, this study enhances the understanding of the relationship between processing techniques, microstructure and fatigue performance in AM alloys. Furthermore, it provides a multiscale analysis framework that integrates microstructural, material and structural information, offering a basis for the accurate prediction and design of fatigue-resistant AM components.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109181"},"PeriodicalIF":5.7,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713070","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}

{"title":"Quantitative assessment of notch fatigue behavior in Mg-RE alloys via zero-point critical distance theory","authors":"Xiao-Min Chen ,&nbsp;Bi-Cheng Xiao ,&nbsp;Yong-Cheng Lin ,&nbsp;Hong-Wei Hu ,&nbsp;Dong-Xu Wen ,&nbsp;Xiao-Jie Zhou ,&nbsp;Jian Zhang ,&nbsp;Yi-Liang Shu","doi":"10.1016/j.ijfatigue.2025.109193","DOIUrl":"10.1016/j.ijfatigue.2025.109193","url":null,"abstract":"<div><div>Notched fatigue tests were conducted at room temperature on three Mg-Y-Zn alloys with varying initial contents of long-period stacking ordered (LPSO) phases. The influence of the notch effect on the fatigue life of these alloys was analyzed. The results indicate that the notch effect significantly reduces the fatigue life of the Mg-Y-Zn alloys, with a higher stress concentration factor correlating to shorter fatigue lives. Under high-stress conditions, the fatigue life of the identical notched specimens decreases as the LPSO phase content increases. Conversely, under low-stress conditions, the fatigue life of the notched specimen tends to increase with rising LPSO phase content. Notably, when compared to parameters such as stress concentration factor, high-stress volume, and relative stress gradient, the relative zero-point parameter provides a more straightforward analytical approach and enables precise notch characterization. A novel zero-point critical distance (ZPCD) model is proposed by incorporating the relative zero-point parameter into the classical TCD framework. Experimental validation demonstrates that the ZPCD model achieves significantly higher prediction accuracy for notch fatigue performance than the traditional TCD method.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109193"},"PeriodicalIF":6.8,"publicationDate":"2025-07-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766655","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}

{"title":"A damage-coupled constitutive model for superalloys accounting for creep–fatigue interactions and load variations","authors":"Nan Lin ,&nbsp;Yuyu Song ,&nbsp;Shuang Zhao ,&nbsp;Fengrui Liu ,&nbsp;Libin Zhao ,&nbsp;Linjuan Wang","doi":"10.1016/j.ijfatigue.2025.109111","DOIUrl":"10.1016/j.ijfatigue.2025.109111","url":null,"abstract":"<div><div>High temperatures and reusable environmental conditions cause the superalloys used in aircraft to experience significant creep–fatigue interactions. Research on the creep–fatigue interactions of superalloys still faces several issues, e.g., the incapability of life prediction models to adapt to diverse loading conditions, the lack of refinement in damage models, and the limited application scope in aircraft structural analysis. To solve the issues, this paper proposes a non-uniform damage-coupled constitutive model which encompasses a creep–fatigue damage model and a life prediction model. The life prediction model takes into account both the dwell time and the total duration of a single cycle, which effectively captures the creep–fatigue life with respect to different loading conditions. The creep–fatigue damage model considers the per-second damage accumulation. This enables the model to accurately reflect both the material and loading characteristics. The stress–strain predictions obtained from the damage-coupled constitutive model show excellent agreement with the experimental results. Finally, the key factors influencing the failure and service life of the aircraft nose cone structure are identified based on the proposed damage-coupled constitutive model. This constitutive model is readily applicable to engineering problems and can offer crucial support for the early-stage structural design of aircraft.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109111"},"PeriodicalIF":6.8,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749435","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}