International Journal of Fatigue最新文献

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Temporal damage accumulation characteristics of plain weave composites under combined high and low cycle fatigue loading employing DIC and AE techniques 基于DIC和AE技术的高、低周复合疲劳载荷下平纹编织复合材料的时间损伤累积特征
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-28 DOI: 10.1016/j.ijfatigue.2025.109204
Zhanguang Chen, Tao Zheng, Li Zhang, Zhongyu Wang, Shangyang Yu, Jindi Zhou, Yidong Zhang, Licheng Guo
{"title":"Temporal damage accumulation characteristics of plain weave composites under combined high and low cycle fatigue loading employing DIC and AE techniques","authors":"Zhanguang Chen,&nbsp;Tao Zheng,&nbsp;Li Zhang,&nbsp;Zhongyu Wang,&nbsp;Shangyang Yu,&nbsp;Jindi Zhou,&nbsp;Yidong Zhang,&nbsp;Licheng Guo","doi":"10.1016/j.ijfatigue.2025.109204","DOIUrl":"10.1016/j.ijfatigue.2025.109204","url":null,"abstract":"<div><div>In this paper, a novel experimental investigation on the combined high and low cycle fatigue (CCF) behavior of plain weave composites (PWCs) is conducted, utilizing a specially designed fatigue loading block. Digital image correlation (DIC) and acoustic emission (AE) techniques are employed for comprehensive damage characterization. Superimposed high-cycle fatigue (HCF) loading is found to significantly reduce fatigue life, accelerate the accumulation of total and residual strain and lead to earlier damage of weft yarns. A fatigue damage mode identification method is developed by the k-means++ clustering analysis and macro/micro-scale damage observation, classifying fatigue AE signals into four modes. Notably, fatigue damage accumulation characteristics exhibit strong time dependency on the loading history. Under CCF loading, early damage primarily occurs during the HCF stage, while continued cycling causes substantial accumulation in both the load-rise and HCF stages. The superimposed HCF loading contributes to an increased number of cumulative AE hits across all loading stages. The presence of HCF loading maintains a consistently high damage accumulation rate for matrix cracking and fiber/matrix debonding throughout the fatigue process, which is the primary factor contributing to fatigue life reduction.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109204"},"PeriodicalIF":6.8,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720812","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
Fatigue damage monitoring of hybrid step-lap joints in thick primary metallic aircraft structures using distributed optical fibre sensors 基于分布式光纤传感器的飞机粗金属结构阶梯搭接混合接头疲劳损伤监测
IF 5.7 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-28 DOI: 10.1016/j.ijfatigue.2025.109177
Amir Ekladious , Leslie Wong , John Wang , Wing Kong Chiu
{"title":"Fatigue damage monitoring of hybrid step-lap joints in thick primary metallic aircraft structures using distributed optical fibre sensors","authors":"Amir Ekladious ,&nbsp;Leslie Wong ,&nbsp;John Wang ,&nbsp;Wing Kong Chiu","doi":"10.1016/j.ijfatigue.2025.109177","DOIUrl":"10.1016/j.ijfatigue.2025.109177","url":null,"abstract":"<div><div>Hybrid joint configurations, which combine adhesive bonding with mechanical fastening, enhance joint strength in primary aircraft structures by leveraging the strengths of both methods. However, they also inherit the quality control challenges of adhesive bonding, particularly in ensuring bond integrity over time. Current non-destructive inspection techniques are limited in reliably detecting weak bonds in hybrid and bonded joints under real-world conditions. This study investigates the behaviour of hybrid and bonded joints with simulated bondline defects that may occur in practice. Distributed optical fibre sensors (DOFS) are employed to provide real-time strain monitoring while capturing disbond initiation and propagation across the overlap region. Findings show that fasteners in hybrid joints delayed crack initiation and slowed disbond growth by reducing Mode I opening and peeling stresses, leading to gradual strain increases and preserving residual strength. Thus, offering a window for maintenance before complete failure. In contrast, bonded joints with similar defects exhibited abrupt failure due to adhesive brittleness. Finite element analysis of the bonded configuration with a degraded adhesive was used to qualitatively validate experimental strain trends. Statistical analyses of the numerically simulated strains along the fibre and joint, including Root Mean Square Error (RMSE), Pearson correlation coefficient, and Maximum Absolute Error (MAE), were conducted to evaluate DOFS reliability. Results indicated a strong correlation between the two, though measurement precision slightly declined for larger disbonds. This study highlights how hybrid joints can enhance the structural durability of bonded step-lap repairs in thick metallic structures when concealed defects are present in the bondline, while establishing DOFS as a robust tool for real-time monitoring and proactive maintenance. This research is part of a certification assessment program for hybrid joining repairs in primary metallic aircraft structures.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109177"},"PeriodicalIF":5.7,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713069","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 defect-based critical plane method for multiaxial high cycle fatigue life prediction in L-PBF Ti-6Al-4V alloy 基于缺陷的L-PBF Ti-6Al-4V合金多轴高周疲劳寿命预测临界平面法
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-27 DOI: 10.1016/j.ijfatigue.2025.109199
Xiaofan Zhang, Jinghao Yang, Yingyu Wang, Shuai Gong
{"title":"A defect-based critical plane method for multiaxial high cycle fatigue life prediction in L-PBF Ti-6Al-4V alloy","authors":"Xiaofan Zhang,&nbsp;Jinghao Yang,&nbsp;Yingyu Wang,&nbsp;Shuai Gong","doi":"10.1016/j.ijfatigue.2025.109199","DOIUrl":"10.1016/j.ijfatigue.2025.109199","url":null,"abstract":"<div><div>A multiaxial high cycle fatigue (HCF) life prediction method is proposed for the laser powder bed fusion (L-PBF) Ti-6Al-4V alloy by integrating the defect-based critical plane method with the Theory of Critical Distances (TCD). The typical defect size inducing fatigue failure is determined by extreme value statistics. The critical plane damage parameters based on the dominant failure modes are selected for accurate life prediction. For materials exhibiting tensile-dominated failure, the critical plane is defined as the maximum opening stress plane, and the Smith-Watson-Topper (SWT) parameter modified by the effective crack driving force is combined with the TCD to predict life. For materials exhibiting shear-dominated failure, the critical plane is defined as the maximum shear stress plane, and the Fatemi-Socie (FS) parameter modified by the effective crack driving force is coupled with the TCD to predict life. The proposed method is validated using fatigue test data of L-PBF Ti-6Al-4V alloys subjected to diverse post-processing treatments. The results demonstrate that 92% of the predicted life points fall within ± 2 standard deviation scatter bands, while the remaining 8% lie between ± 2 standard deviation scatter bands and ± 3 standard deviation scatter bands.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109199"},"PeriodicalIF":6.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144724448","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
Fatigue life evaluation model of friction self-piercing riveted aluminum alloy sheets based on the structural stress method 基于结构应力法的摩擦自穿铆接铝合金板疲劳寿命评价模型
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-27 DOI: 10.1016/j.ijfatigue.2025.109198
Jiarui Yuan , Yunwu Ma , Hailang Wan , Wu Xu , Peng Li , Ninshu Ma , Yongbing Li
{"title":"Fatigue life evaluation model of friction self-piercing riveted aluminum alloy sheets based on the structural stress method","authors":"Jiarui Yuan ,&nbsp;Yunwu Ma ,&nbsp;Hailang Wan ,&nbsp;Wu Xu ,&nbsp;Peng Li ,&nbsp;Ninshu Ma ,&nbsp;Yongbing Li","doi":"10.1016/j.ijfatigue.2025.109198","DOIUrl":"10.1016/j.ijfatigue.2025.109198","url":null,"abstract":"<div><div>Friction self-piercing riveting (F-SPR) provides an enabling technology for achieving high-efficiency riveting without prefabricated holes in aerospace. Hence it is of great significance to evaluate the fatigue life of the novel F-SPR joints under different loads. For this purpose, three types of F-SPR joints are designed to account for different fatigue loaded states, including high-load stress state joints, zero-load stress state joints and low-load stress state joints. Fatigue tests with different load levels are conducted to acquire the fatigue life data of F-SPR joints. The typical failure location of the F-SPR joints is determined as the region surrounding the rivet tip in the lower sheet. The structural stress on the critical cross-section of F-SPR joints is analytically derived via structural stress theory. A simplified model with beam-shell element of the F-SPR joint is proposed to calculate the structural stress. The contribution of different structural stress components to the effective structural stress is quantified, and the normal structural stress is identified as the critical factor for all the joints. Finally, the master <em>S</em>-<em>N</em> curve for different joints is fitted, achieving the unified life evaluation for F-SPR joints. Meanwhile, the high correlation of the fitting results proves the validity of the proposed model. The proposed method is useful for the analysis of both F-SPR and other spot-welded structures.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109198"},"PeriodicalIF":6.8,"publicationDate":"2025-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720811","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
Effect of thermo-mechanical treatment on the static and cyclic performance of cold sprayed 6061 aluminum alloy 热处理对冷喷涂6061铝合金静态和循环性能的影响
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-27 DOI: 10.1016/j.ijfatigue.2025.109197
Ahmad Nourian , Ondrej Kovarik , Jan Cizek , Jaroslav Cech , Shiyu Zhue , Teichii Ando , Sinan Müftü
{"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}
引用次数: 0
The relationship between the self-heating behavior and damage mechanism of carbon fiber/epoxy composites subjected to random vibration fatigue 随机振动疲劳下碳纤维/环氧复合材料自热行为与损伤机理的关系
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-27 DOI: 10.1016/j.ijfatigue.2025.109203
Cong Zhang , Yongzhi Li , Guanchen Zhao , Erming He
{"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}
引用次数: 0
Damage and microstructure evolution for rolling contact fatigue of a CSS-42L gear steel under mixed lubrication 混合润滑下CSS-42L齿轮钢滚动接触疲劳损伤及组织演变
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-25 DOI: 10.1016/j.ijfatigue.2025.109196
Hua-Zhen Jiang , Jiajun Liu , Zheng-Yang Li , Jian Zhan , Wenquan Cao , Fuping Yuan , Chengqi Sun
{"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}
引用次数: 0
An improved cyclic plastic model for carbide-free bainitic steel considering the influence of cyclic softening on ratcheting behavior 考虑循环软化对棘轮行为影响的改进无碳化物贝氏体钢循环塑性模型
IF 5.7 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-25 DOI: 10.1016/j.ijfatigue.2025.109192
Xiang Xu , Peilin Fu , Jianping Zhao , Xiaowei Wang , Jianming Gong , Guhui Gao , Qianhua Kan
{"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}
引用次数: 0
Multiscale modelling of additively manufactured Ti-6Al-4V alloy: Fatigue performance evaluation from material to structural level 增材制造Ti-6Al-4V合金的多尺度建模:从材料到结构水平的疲劳性能评价
IF 5.7 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-25 DOI: 10.1016/j.ijfatigue.2025.109181
Weiqian Chi , Wenjing Wang , Hongchang Zhou , Ruiguo Yan , Yoshiki Mikami
{"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}
引用次数: 0
Effect of hold time on dwell fatigue behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with equiaxed microstructure 保温时间对等轴组织Ti-6.5Al-3.5Mo-1.5Zr-0.3Si合金疲劳行为的影响
IF 6.8 2区 材料科学
International Journal of Fatigue Pub Date : 2025-07-25 DOI: 10.1016/j.ijfatigue.2025.109194
Chao Fang , Jianke Qiu , Mingjie Zhang , Lixin Liu , Jiafeng Lei , Rui Yang
{"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}
引用次数: 0
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