International Journal of Fatigue最新文献

{"title":"Compression-compression fatigue of quasi-isotropic laminates: Failure mechanisms and link between dissipative behavior and fatigue life","authors":"O.Zimmermann de Almeida, N. Carrere, M.Le Saux, V.Le Saux, G. Moreau, Y. Pannier, S. Castagnet, Y. Marco","doi":"10.1016/j.ijfatigue.2024.108780","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108780","url":null,"abstract":"Few studies have investigated the fatigue of composite laminates under cyclic compression loading. Moreover, the self-heating approach to rapidly predict fatigue life has rarely been applied to this type of material. The objective of this work is to study the fatigue of a quasi-isotropic laminate under compression-compression loadings and to assess the possibility of rapidly determining an endurance limit from a self-heating test. Compression-compression fatigue and self-heating tests were carried out on a carbon/epoxy quasi-isotropic laminate with a stress ratio of 10. Fatigue tests were conducted for lifetimes up to 10<ce:sup loc=\"post\">8</ce:sup> cycles. The damage scenario is investigated by interrupting fatigue tests and conducting subsequent observations of the samples using scanning electron microscopy and X-ray micro-computed tomography. A methodology for analyzing self-heating tests is applied, which allows the determination of the mean volumetric intrinsic cyclic dissipation of the laminate from surface thermal measurements. A method using a viscoelastic constitutive law is proposed to estimate the endurance limit from the self-heating curve.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"27 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874832","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 effect of surface gradient nanostructure and compressive residual stress on fretting fatigue of A100 ultra-high strength steel by ultrasonic surface rolling process","authors":"Weidong Zhao, Daoxin Liu, Hailan Shi, Zhiqiang Hao, Jingwei Zhao","doi":"10.1016/j.ijfatigue.2024.108775","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108775","url":null,"abstract":"The critical challenge in enhancing the fretting fatigue performance of A100 ultra-high strength steel (A100 steel) involved reconciling the conflicting attributes of strength and toughness. In our study, the ultrasonic surface rolling process (USRP) was harnessed to induce gradient nanostructures and a compressive residual stress field on the surface of A100 steel, with the goal of strengthening its wear and fatigue resistance. Through meticulous optimization of USRP parameters over 30 passes, a gradient nanostructure with a substantial depth of approximately 400 μm was successfully formed, while minimizing the martensite lath width on the surface to a mere 44.5 nm. The nanocrystalline mechanism of USRP treatment of A100 steel was the interaction of dislocation proliferation and nailing of nanoscale carbides to form high density low angle grain boundaries and smaller martensitic laths. The introduction of these gradient nanostructures resulted in a notable increase in the depth of the hardened layer and the compressive residual stress field, doubling the original state. Additionally, the fretting fatigue threshold was found to be enhanced by 14.3 %. A factor separation approach revealed that the combined influence of the gradient nanostructure and compressive stress field considerably improved resistance to fretting wear and extended fatigue life. This synergy effectively curbed the nucleation and growth of fretting fatigue cracks, with the compressive residual stress playing a pivotal role in bolstering fretting fatigue resilience.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"1 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874833","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":"Mean strain effect on low-cycle fatigue of AISI 304 austenitic stainless steel under non-proportional random loading: Experiments and life evaluation methods","authors":"Yu-Chen Wang, Le Xu, Lei He, Shoto Yoshikawa, Keisuke Yamashita, Shan-Tung Tu, Takamoto Itoh","doi":"10.1016/j.ijfatigue.2024.108769","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108769","url":null,"abstract":"The mean strain effect on AISI 304 stainless steel was examined through strain-controlled low-cycle fatigue tests under uniaxial and non-proportional random loading. Under uniaxial loading, cyclic stress responses showed initial hardening followed by continuous softening, typical of austenitic stainless steel. In contrast, non-proportional loading resulted in consistent hardening. Mean strain primarily influenced fatigue life by altering the stress range: a reduced stress range generally led to extended life. Mean stress relaxation was observed and analyzed under various mean strains. An improved Itoh–Sakane (IS) method was developed, incorporating the calculation of mean strain coordinates and a new coordinate system. This enhancement allows accurate calculation of principal strain and stress under mean strain conditions, significantly improving life evaluation accuracy, with results typically within a factor of 2. Based on this, a new life evaluation method was established, applicable to strain-based models and their modifications, as well as energy-based models. The advantages and disadvantages of different models were compared.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"113 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874834","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":"Investigation on fatigue behavior and failure mechanism of quasi-3D woven composites under combined high and low cycle fatigue","authors":"Shuang Qiu, Haitao Cui, Hongjian Zhang","doi":"10.1016/j.ijfatigue.2024.108768","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108768","url":null,"abstract":"This paper experimentally investigates the fatigue behavior and failure mechanism of a quasi-three-dimensional woven composite (Q3DWC) under combined high and low cycle fatigue loading (CCF) for the first time. In this study, to develop a composite with high tensile strength and sufficient delamination resistance, a Q3DWC structure is firstly designed. Then, a novel biaxial experimental platform, including the longitudinal tensile system, the lateral excitation system, and the dynamic signal monitoring system, is established. Based on this platform, a comprehensive analysis, including fatigue life, stiffness degradation, energy dissipation, and fracture morphology, is conducted. Results indicate that the superimposed high cycle fatigue (HCF) significantly reduces the fatigue life when compared to low cycle fatigue (LCF) life. Stiffness degradation and energy dissipation are obtained by hysteresis loops, showing that the entire fatigue process is mainly divided into three stages. Moreover, fracture morphologies are analyzed via scanning electron microscopy (SEM), indicating more severe fiber pull-out and fiber/matrix debonding due to the introduction of HCF vibration. Finally, the probable damage evolution under LCF and CCF loading is discussed separately. This study provides valuable references for the design and safe application of composites under CCF loading.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"7 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874835","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":"Fatigue limits and crack growth thresholds in cyclic tension and bending of a stainless steel sheet","authors":"Gyoko Oh, Atsushi Umezawa","doi":"10.1016/j.ijfatigue.2024.108774","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108774","url":null,"abstract":"Many parts made of thin steel sheet are subjected to two types of loads: tension and bending. In this study, we define and suggest<ce:hsp sp=\"0.25\"></ce:hsp>novel fatigue failure criteria based on the outcomes of testing specimens with various notch lengths under these two loading modes at constant and different stress ratios. Large cyclic plastic strains occurred near the notch, which were taken into account in the evaluation of the threshold stress intensity range Δ<ce:italic>K<ce:inf loc=\"post\">th</ce:inf></ce:italic>. The fatigue limit under tension load was lower than that under plane bending load, and it had an inflection point on the relationship line with notch length. In mode I fracture, Δ<ce:italic>K<ce:inf loc=\"post\">th</ce:inf></ce:italic> became a constant value at the notch length corresponding to the boundary between short and long cracks, but no such inflection point was observed in mode IIII fracture. A calculation model for the critical stress intensity range Δ<ce:italic>K<ce:inf loc=\"post\">thc</ce:inf></ce:italic>, which is a constant value regardless of the length of the notch or crack, was presented. Using the strength factor to quantify the effect of stress ratio, the change in Δ<ce:italic>K<ce:inf loc=\"post\">th</ce:inf></ce:italic> was evaluated. A prediction model for the effective stress intensity range that takes into account the plasticity-induced crack closure effect was also presented.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"125 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874836","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":"Cryogenic impact and fatigue properties of additively manufactured CrCoNi medium entropy alloy","authors":"Sun-Kwang Hwang, Minh Tien Tran, Cong Hoang Dang, Jeong-Min Heo, Ho Won Lee, Kyung-Hwan Jung, Dong-Kyu Kim","doi":"10.1016/j.ijfatigue.2024.108767","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108767","url":null,"abstract":"For structural applications subjected to rapid and cyclic loading, impact toughness and fatigue strength are critical properties that determine material suitability. CrCoNi medium entropy alloys (MEAs) have garnered attention due to their exceptional mechanical properties. Therefore, it is essential to assess the structural integrity of this alloy under harsh environments. This study investigates the impact and fatigue properties of CrCoNi MEA processed via laser powder bed fusion (LPBF) at both room and cryogenic temperatures. Charpy V-notch impact tests were conducted at 298 K, 200 K, and 77 K, while high-cycle fatigue tests were performed at 298 K and 150 K. The results show exceptional impact toughness at all temperatures, although toughness decreases as temperature drops. At 298 K, Charpy impact specimens exhibit more significant deformation, with cracks primarily following grain boundaries, while at 200 K and 77 K, <ce:italic>trans</ce:italic>-granular cracking dominates. Additionally, fatigue properties of LPBF CrCoNi MEA at 150 K show significant improvement compared to those at 298 K, attributed to the higher density of deformation twins forming at lower temperature during fatigue. These findings demonstrate that LPBF CrCoNi MEA offers a promising combination of impact and fatigue properties at cryogenic temperatures, suggesting its suitability for cryogenic applications.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"38 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825397","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":"Synchrotron X-ray 3D characterisation of fatigue crack initiation during in-situ torsion cyclic tests","authors":"Viet-Duc Le, Franck Morel, Nicolas Saintier, Pierre Osmond, Daniel Bellett, Wolfgang Ludwig, Marta Majkut, Jean-Yves Buffiere","doi":"10.1016/j.ijfatigue.2024.108762","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108762","url":null,"abstract":"This paper focuses on the characterisation of fatigue crack initiation mechanisms under fully reversed torsional loads for the porosity-containing cast AlSi7Mg0.3 aluminium alloy by synchrotron X-ray tomographic imaging and Diffraction Contrast Tomography (DCT). The aim is to analyse the relation between crack initiation and the microstructure, in the fatigue regime close to the fatigue limit of the material (fatigue lives of approximately <mml:math altimg=\"si3.svg\" display=\"inline\"><mml:mrow><mml:mn>2</mml:mn><mml:mo linebreak=\"goodbreak\" linebreakstyle=\"after\">×</mml:mo><mml:mn>1</mml:mn><mml:msup><mml:mrow><mml:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math> cycles). In-situ torsion fatigue tests have been conducted at the European Synchrotron Radiation Facility. A large number of cracks (approximately 80 cracks) were analysed, at the surface and in the bulk, highlighting the role of the surrounding microstructure on the crack initiation mechanisms. Contrary to uniaxial loads in which fatigue crack initiation from casting pores in an opening mode (mode I) is generally only observed for this material, it is shown in this work that multiple crack initiations mechanisms can appear simultaneously under torsional loads. This is very interesting because it is possible to analyse different mechanisms (and the effect of the surrounding microstructure) using the same specimen, that is under identical loading conditions. More precisely, two different crack initiation mechanisms were observed. The first mechanism involves intra-granular fatigue crack initiation from Persistent Slip Bands (PSBs) formed on the slip system with the highest Schmid factor. For this mechanism, the grain orientation is the key parameter. A shear stress threshold of approximately 80 MPa is observed to trigger this mechanism. The presence of a pore, in the crack initiation zone reduces this threshold. The second mechanism concerns crack initiation from pores, in mode I, on planes of maximum principal stress. No link to the local grain orientation was found in that case. The pore size is the key factor governing this crack initiation mechanism. Regarding the competition between these mechanisms in the formation of the final crack, it was observed that at high applied stress, the cracks initiated from PSBs are dominant due to their high density and high growth rates resulting from coalescence. At lower stress, cracks initiated from pores are dominant, mainly because of the little effect of grain boundaries and eutectic zones, while most of cracks initiated from PSBs are arrested within the grain where they have initiated.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"85 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874837","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 influence of water content on the mechanical responses of polyacrylamide hydrogels under stress-controlled cyclic loadings","authors":"Xuelian Zhang, Junjie Liu, Jian Li, Zhihong Liang, Qianhua Kan, Guozheng Kang","doi":"10.1016/j.ijfatigue.2024.108766","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108766","url":null,"abstract":"In this work, polyacrylamide (PAAm) hydrogels with different water contents (WCs) were prepared, and stress-controlled cyclic experiments were carried out. The effect of water content on the mechanical behavior of PAAm hydrogels was observed through stress–strain curves, apparent modulus, and dissipation energy across various loading cycles. It is concluded that with the increase in the WC, the peak and valley strains and the dissipation energy increase while the apparent modulus decreases. The WC significantly influences the evolution of dissipation energy with the increase of the loading cycles. For PAAm hydrogels with a relatively high WC (from 96% to 67%), the dissipation energy decreases appreciably between the first and the second loading cycles and then remains stable with increasing the loading cycles further. However, for PAAm hydrogels with a relatively low WC (50% and 34%), the dissipation energy decreases significantly between the first two cycles and then increases with increasing the loading cycles. Experimental results obtained under constant relative humidity and constant WC were compared, validating that the water loss leads to a decrease in the strain and an increase in the apparent modulus during the loading cycles.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"2 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142874838","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":"In-situ SEM investigation of fatigue crack propagation through cross-weld area in WAAM low-carbon steel and the role of microstructures in propagation behavior","authors":"Jingjing He, Mengyu Cao, Xiaoyi Li, Xinyan Wang, Xiaoming Wang, Xuefei Guan","doi":"10.1016/j.ijfatigue.2024.108765","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108765","url":null,"abstract":"In-situ SEM fatigue testing is performed to investigate crack propagation through the heat affected zone as well as in the base material and deposited material in a wire and arc additive manufacturing (WAAM) low-carbon steel part. The slip band formation and development prior to crack initiation and the crack growth rate are monitored in-situ and compared using fatigue testing specimens sampled from the base material, heat affected zone, WAAM zone, and cross-weld zone. Results show that the cross-weld zone specimen has the lowest crack growth rate, followed by the heat affected zone specimen and the two base material specimens. The effect of banded pearlite, acicular ferrite, and grain boundary and orientation is discussed with the aid of optical metallographic images, SEM, and EBSD maps. The mechanisms of the lowest rate observed in the cross-weld zone specimen are the pearlite bands preventing slip transfer, the high angle grain boundary of ultra-fine acicular ferrite hindering the crack propagation, as well as the basketweave structure promoting a zigzag growth path.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"36 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825399","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":"Fatigue failure mechanisms and influential factors for aluminum alloy and its welded joint in a high-speed train","authors":"Yangyang Yu, Yiyun Guo, Saisai Wang, Junshuang Cai, Han Wu, Yeheng Song, Shao-Shi Rui, Chengqi Sun","doi":"10.1016/j.ijfatigue.2024.108759","DOIUrl":"https://doi.org/10.1016/j.ijfatigue.2024.108759","url":null,"abstract":"Aluminum alloy and its welded joint are widely used in high-speed trains, which are subjected to complex fatigue loadings in service. The fatigue failure mechanisms and influential factors for Base Metals (BMs) and Welding Metals (WMs) subjected to low cycle (dwell) fatigue (<ce:italic>R</ce:italic> = 0) and (very) high cycle fatigue (<ce:italic>R</ce:italic> = −1) loads were investigated. The development of cumulative strain in tension–tension low cycle (dwell) fatigue was attributed to “cyclic ratcheting effect”, which developed only when the applied maximum stress level is higher than the yield strength. In that condition, the cumulative strains continually developed and resulted in ductile fracture for BMs, but gradually converged to a finite value and resulted in fatigue fracture for WMs. Further, the dwell loading contributed to slowing down the development speed of cumulative strain and extending the fatigue life for BMs. Moreover, the welding processing reduced the (very) high cycle fatigue strengths and shortened the fatigue lives due to the introduction of welding defects, and a model replacing the nominal maximum stress by an equivalent one was proposed for modeling the impact of those defects on fatigue properties, which agrees with the <ce:italic>S</ce:italic>-<ce:italic>N</ce:italic> data.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"12 1","pages":""},"PeriodicalIF":6.0,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142825401","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}