International Journal of Fatigue最新文献

{"title":"Fatigue performance and failure mechanisms of vacuum brazed AISI 304L joints with experimental nickel-based filler metals in air and corrosive environments","authors":"Johannes L. Otto,&nbsp;Lukas M. Sauer,&nbsp;Cedric Marroni,&nbsp;Fabian Bersch,&nbsp;Alexander Delp,&nbsp;Hanigah Kanagarajah,&nbsp;Frank Walther","doi":"10.1016/j.ijfatigue.2025.109082","DOIUrl":"10.1016/j.ijfatigue.2025.109082","url":null,"abstract":"<div><div>Brazing with nickel-based filler metals under vacuum is frequently applied for joining metals in applications that require high resistance to mechanical loads, corrosive environments and elevated temperatures. However, melting-point depressant elements in the filler can lead to brittle phases in the brazing seam, affecting crack initiation and propagation. This study investigated cylindrical butt joints of metastable austenitic AISI 304L, brazed with NiCrSiB–based fillers containing iron and molybdenum. Tensile, fatigue and corrosion tests were applied to identify the most promising filler for subsequent corrosion fatigue experiments in a self-developed test chamber. Results in air showed that fatigue performance close to AISI 304L can be achieved, when problematic Kirkendall voids and athermal brittle phases are avoided. Corrosion fatigue tests in aqueous environments with varying sodium chloride concentrations and elevated temperatures revealed that cracked chromium-rich borides in the diffusion-affected zone act as microgalvanic elements, accelerating corrosion fatigue via hydrogen embrittlement. At 80 °C, these mechanisms became widespread, leading to multiple crack initiations across the steel surface and not just in the brazing seam. Hence, this study highlights the complex interplay of microstructure, cyclic loading, and environmental effects, offering key insights into the failure mechanisms of vacuum-brazed joints under combined mechanical and corrosive stresses.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109082"},"PeriodicalIF":5.7,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170269","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":"Towards understanding the time-dependent microstructural evolution mechanism of GCr15 bearing in rolling contact fatigue","authors":"Liming Shu ,&nbsp;Jiahui Fan ,&nbsp;Jianhua Liu ,&nbsp;Liyu Lin ,&nbsp;Yuanyu Wei ,&nbsp;Zhenglong Fang","doi":"10.1016/j.ijfatigue.2025.109078","DOIUrl":"10.1016/j.ijfatigue.2025.109078","url":null,"abstract":"<div><div>We conducted an in-depth investigation into the subsurface-initiated rolling contact fatigue failure of GCr15 bearing elements subjected to high-cycle loading, emphasizing the comprehensive understanding on the time-dependent microstructural evolutions mechanism with respect to the rolling element ball and inner/out raceway. To this end, a specialized experimental strategy was implemented, maintaining consistent bearing geometry through systematic replacement of rolling elements while preserving structural integrity. This methodology enabled comprehensive observation and analysis of time-dependent microstructural transformations throughout the failure process, facilitating precise temporal tracking of microstructural evolution during progressive degradation. Microstructural features, including grain size, dislocation density, and phase transformations, were quantified using electron backscatter diffraction. These metrics were then correlated with the distribution of dark etching regions (DERs) and the stress fields generated under varying alternating stress conditions. The analysis revealed that grain refinement was the dominant mechanism governing the subsurface microstructural changes, with the near-surface region exhibiting approximately a 50% reduction in grain size during operation. Furthermore, the study suggests that stress conditions in different bearing elements may significantly influence their microstructural responses, potentially leading to notable DER formation. These findings provide insights into rolling contact failure mechanisms and highlight importance of relationship between stress conditions and microstructural changes.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109078"},"PeriodicalIF":5.7,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144146906","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":"Micro-pores formation mechanism and porosity on the fatigue performance of dual laser-powder bed fusion of Ti6Al4V","authors":"Guotai Li ,&nbsp;Peichen Hu ,&nbsp;Gang Chen ,&nbsp;Mingjun Chen ,&nbsp;Tianyu Yu","doi":"10.1016/j.ijfatigue.2025.109077","DOIUrl":"10.1016/j.ijfatigue.2025.109077","url":null,"abstract":"<div><div>Porosity significantly impacts the fatigue performance and stability of dual laser additively manufactured metallic materials. This study presents a comparative analysis of the fatigue behavior of samples fabricated by single-laser powder bed fusion (SL-PBF) and dual-laser PBF (DL-PBF). It shows that porosity defects in the overlap region reduced the fatigue strength of DL-PBF samples by nearly 20 %. Micro-CT analysis revealed that micro-pores in the SL-PBF samples were predominantly located in the contour regions. Machining with a removal depth of 0.5 mm has effectively eliminated over 90 % of internal porosity defects. For monolithic specimens, increasing the sample size and reducing the layer-wise slice area can improve the sphericity of the internal defects (0.71 to 0.85) and reduce the porosity density (0.19 % to 0.011 %). Molecular dynamics simulations further examined the influence of pore size, spacing, and quantity on fatigue behavior. Larger pore sizes promote the formation of {11 <span><math><mrow><mover><mrow><mtext>2</mtext></mrow><mrow><mo>¯</mo></mrow></mover></mrow></math></span> 1} &lt;<span><math><mrow><mover><mrow><mtext>1</mtext></mrow><mrow><mo>¯</mo></mrow></mover><mover><mrow><mtext>1</mtext></mrow><mrow><mo>¯</mo></mrow></mover></mrow></math></span>26&gt; twin variants, as the pore diameter increased from 20 Å to 80 Å, the proportion of variants structure increased from 3.6 % to 11.5 %. Fatigue failure initiated from a single pore, with stress propagating towards a distant pore, forming crack paths. Stress was relieved along these crack trajectories, leading to secondary crack branches that spread into low-stress zones around other defects, which resulted in fatigue cracks with vein-like morphologies. This work provides systematic insights into the fatigue degradation mechanisms induced by porosity and offers actionable strategies for improving the fatigue resistance of multi-laser PBF components through process control.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109077"},"PeriodicalIF":5.7,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144170270","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":"Fretting fatigue damage and crack propagation of shot-peening dovetail joints assisted with the U-Net model","authors":"Zhiguo Wang ,&nbsp;Zheng Wang ,&nbsp;Kai Sun ,&nbsp;Shi Chen ,&nbsp;Yongfeng Zheng ,&nbsp;Xiuyang Fang ,&nbsp;Zhenbing Cai","doi":"10.1016/j.ijfatigue.2025.109074","DOIUrl":"10.1016/j.ijfatigue.2025.109074","url":null,"abstract":"<div><div>This study systematically examines the fretting fatigue behavior of Ti-6Al-4 V dovetail joints with and without shot-peening (SP) treatment, focusing on crack initiation, propagation mechanisms, and SP-induced microstructural modifications. An innovative four-camera in situ observation system was developed to track real-time crack evolution at four critical locations of the dovetail tenon. Integrated with deep learning-based U-Net models for crack segmentation and length quantification, the effects of SP treatment on fretting fatigue life, crack propagation rates, and surface damage were analyzed under varying loads (26–40 kN). The results demonstrate that SP treatment significantly enhances overall fretting fatigue life at low and medium loads (26–34 kN) by delaying crack initiation and early propagation through compressive residual stresses (CRS) and strain hardening, achieving maximum life enhancement of 186.19 % at 26 kN, while proving ineffective in suppressing long-crack growth under cyclic stress superposition. At 40 kN, SP exhibits detrimental effects due to accelerated CRS relaxation and stress concentration induced by surface roughness. Although the initiation life remains superior to untreated specimens, the overall fretting fatigue life decreases due to accelerated crack propagation rates. These findings highlight the dual role of SP in fretting fatigue resistance, emphasizing the necessity of load-dependent optimization strategies for aerospace applications.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109074"},"PeriodicalIF":5.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117123","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":"ANN vs. theoretical models for predicting crack path in fretting fatigue","authors":"Raphael Araújo Cardoso ,&nbsp;José Alexander Araújo ,&nbsp;Lucival Malcher ,&nbsp;André Luís Rodrigues Araújo","doi":"10.1016/j.ijfatigue.2025.109075","DOIUrl":"10.1016/j.ijfatigue.2025.109075","url":null,"abstract":"<div><div>Fretting fatigue (FF) involves multiaxial and non-proportional stress states in addition to strong stress gradients, making crack propagation modeling challenging. In this work, we evaluate different models based on stress intensity factors (SIFs) to predict crack propagation kink angles under FF conditions, including both theoretical and artificial neural network (ANN) models. To train and test the ANN model, we collected FF data on Al alloys from six different sources in the literature, where the crack paths observed in the experiments were available. Testing data was also used to assess the performance of the theoretical models in predicting crack propagation kink angles. We demonstrate that the ANN model outperforms the theoretical models in predicting crack propagation kink angles. Finally, we compared the investigated models by simulating the crack propagation path under FF conditions using finite element modeling. The results indicate that, although the ANN model was more accurate in predicting the kink angle for a given crack configuration observed in the experiments, its performance was comparable to the theoretical models that account for non-proportional effects when estimating the crack propagation path. However, under high compressive states, the ANN model predicted more stable crack paths than the theoretical models.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109075"},"PeriodicalIF":5.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144131355","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 different precipitated phase structures on low-cycle fatigue properties of Mg-Gd-Y-Zn-Zr alloy","authors":"Yayun He ,&nbsp;Yun Cui ,&nbsp;Rui Guo ,&nbsp;Xi Zhao ,&nbsp;Hangyu Xu ,&nbsp;Shaowu Feng","doi":"10.1016/j.ijfatigue.2025.109071","DOIUrl":"10.1016/j.ijfatigue.2025.109071","url":null,"abstract":"<div><div>This study conducts low-cycle fatigue tests on an extruded magnesium alloy cabin. The relationship between the microstructure and macroscopic cyclic-deformation behavior was established by regulating the microstructure of the different precipitated phases. The results show that only the β’ phase is precipitated in the 200AT sample, and lamellar Long-Period Stacking Ordered (LPSO) phase and β’ phase overlapping structures are precipitated in the 250AT sample. Different microstructural states lead to the intersection of the fatigue-life curves of the two samples. Under a low strain amplitude, the 200AT sample is more likely to produce short-range reversible basal slip, which easily releases stress and has a high fatigue life. The 250AT sample has a low fatigue life because the stress concentration in the grain caused by the irreversible &lt; c + a &gt; slip of the medium growth process leads to higher intragranular strength, and the crack initiates along the grain boundary with weaker strength. At high strain amplitudes, cracks in the 200AT sample mainly propagate along the basal and prismatic planes with faster crack-propagation speeds and lower fatigue resistance. In contrast, cracks in the 250AT sample mainly propagate along the pyramidal &lt; a &gt; and pyramidal &lt; c + a &gt; directions with slower crack-propagation speeds and higher fatigue resistance.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109071"},"PeriodicalIF":5.7,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117083","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":"Early detection and monitoring of fatigue damage in medium carbon steel based on multi-micromagnetic NDT fusion method","authors":"Zheng-Xiang Shen ,&nbsp;Sheng-Jie Qian ,&nbsp;Hui-Yu Ji ,&nbsp;Wei-Wei Ji ,&nbsp;Bo Xu ,&nbsp;Yang Zheng","doi":"10.1016/j.ijfatigue.2025.109069","DOIUrl":"10.1016/j.ijfatigue.2025.109069","url":null,"abstract":"<div><div>Based on stress-controlled fatigue tests of 45 carbon steel notched specimens, an in-situ comprehensive evaluation of fatigue damage evolution was accomplished via micromagnetic non-destructive testing techniques, and various magnetic parameters were then determined to describe the actual fatigue state. In general, the characteristics quantities extracted from magnetic hysteresis, Barkhausen noise and incremental permeability measurements exhibited a trend of initial oscillations during the early stages of fatigue, reflecting fatigue softening. As the load cycle increased, the magnetic parameters became stabilized and experienced drastic changes in the final stage before failure. Evidently, the dynamic dependence of fatigue magnetization behavior was related to the progressive accumulation of damage by the cyclic loading. Among those, the magnetic incremental permeability method was highly sensitive to the fatigue damage before a macroscopic crack was initiated. Particularly, the Mean eigenvalues of incremental permeability signals presented a nonlinear increment behavior, starting approximately from the 80 % of fatigue life, which could be used to assess the degree of damage quantitatively. Furthermore, the unique zero-crossing feature of Mean value at 94.2 % lifetime can serve as a warning for imminent fatigue failure of the component.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109069"},"PeriodicalIF":5.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123769","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 computational framework for predicting the effect of surface roughness in fatigue","authors":"Sara Jiménez-Alfaro ,&nbsp;Emilio Martínez-Pañeda","doi":"10.1016/j.ijfatigue.2025.109044","DOIUrl":"10.1016/j.ijfatigue.2025.109044","url":null,"abstract":"<div><div>Surface roughness is a critical factor influencing the fatigue life of structural components. Its effect is commonly quantified using a correction coefficient known as the surface factor. In this paper, a phase field based numerical framework is proposed to estimate the surface factor while accounting for the stochastic nature of surface roughness. The model is validated against existing experimental data. Furthermore, we investigate the influence of key parameters on the fatigue life of rough surfaces, such as surface topology and failure strength. An important effect of surface roughness is observed when the average surface roughness increases and the correlation length of the surface profile decreases. This effect becomes more pronounced with higher failure strengths.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109044"},"PeriodicalIF":5.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138553","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":"Reliability analysis method for aircraft structure corrosion fatigue based on Chaboche model","authors":"Zhang Zhuzhu ,&nbsp;Mao Haitao ,&nbsp;Huang Hailiang ,&nbsp;Wu Xingjun ,&nbsp;Shen Pei ,&nbsp;Liu Yulin","doi":"10.1016/j.ijfatigue.2025.109070","DOIUrl":"10.1016/j.ijfatigue.2025.109070","url":null,"abstract":"<div><div>A reliability analysis method for predicting the service life of aircraft structures considering corrosion damage has been proposed. This method introduces corrosion damage as the initial damage into the Chaboche fatigue cumulative damage model, and uses Monte Carlo method to simulate and reconstruct the corrosion fatigue damage process of the structure, achieving reliability analysis of the corrosion fatigue life of aircraft structures. To verify the effectiveness of the proposed method, SO₂ salt spray accelerated corrosion test and corrosion fatigue test were conducted on A100 steel as a case study, revealing the damage law and mechanism of A100 steel under corrosive environment and fatigue load. By establishing a Chaboche fatigue cumulative damage model for A100 steel and completing model parameter calibration, the reliability of structural corrosion fatigue life was evaluated using the proposed reliability method. This method can improve the maintainability and reliability requirements of aircraft structures in corrosive environments, providing a new approach for aircraft structure safety assessment, life monitoring, and life extension.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109070"},"PeriodicalIF":5.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147002","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":"Pre-corrosion very-high-cycle AI-fatigue in completion string","authors":"Zhenyu Zhu ,&nbsp;Hailong Kong ,&nbsp;Yongyou Zhu ,&nbsp;Mattias Calmunger ,&nbsp;Guocai Chai ,&nbsp;Qingyuan Wang ,&nbsp;Wei Feng","doi":"10.1016/j.ijfatigue.2025.109068","DOIUrl":"10.1016/j.ijfatigue.2025.109068","url":null,"abstract":"<div><div>The very-high-cycle fatigue (VHCF) behavior of material BG2532, used in oil and gas completion strings, was investigated under both non-corrosive and hydrogen sulfide (H₂S) gas corrosion conditions. During the experiment, the material’s fatigue property and fatigue fracture characteristics were studied. Additionally, the microstructure on the axial cross-section, perpendicular to the fatigue fracture surface, was analyzed to explore the mechanism of corrosion-induced VHCF crack initiation. To enable unified VHCF life prediction for the material under both corrosive and non-corrosive conditions, different VHCF life prediction models were developed. Fatigue fracture characteristics, including the number of grains per unit area on fatigue source and the facet ratio on propagation area, were proposed as key parameters for VHCF modeling. Two artificial intelligence (AI)-fatigue models incorporating corrosion effects were developed and compared. The results show that integrating fatigue source and propagation characteristics using deep learning and convolutional neural networks significantly enhances the accuracy of VHCF life predictions, with errors remaining within a factor of two. This model effectively predicts the VHCF life of BG2532 alloy under both corrosive and non-corrosive conditions.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"199 ","pages":"Article 109068"},"PeriodicalIF":5.7,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144123768","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}