International Journal of Fatigue最新文献

{"title":"Fatigue crack propagation behavior and damage mechanism of Ti-Mo-Cr-V-Nb-Al alloy in the near-threshold region","authors":"Rui Hu ,&nbsp;Wangjian Yu ,&nbsp;Guoqiang Shang ,&nbsp;Gang Ran ,&nbsp;Hong Wang","doi":"10.1016/j.ijfatigue.2025.109209","DOIUrl":"10.1016/j.ijfatigue.2025.109209","url":null,"abstract":"<div><div>To meet the requirements of damage tolerance design for high-strength and high-toughness metastable β titanium alloys, it is of vital significance to regulate and obtain an appropriate microstructure for enhancing the fatigue resistance of such titanium alloys. This work mainly conducts a comparative study on the fatigue crack growth threshold value Δ<em>K_th</em> of a novel high-strength and high-toughness Ti-Mo-Cr-V-Nb-Al titanium alloy with basketweave and bi-modal microstructures, exploring the influence of its microstructure on fatigue crack initiation and growth behavior and the corresponding damage mechanism. It is discovered that equiaxed α_P phases are more prone to causing crack deflection compared with coarse lamellar α_P phases. Furthermore, the crack resistance of this alloy mainly originates from the crack deflection induced by α_P phases and the crack tip blunting caused by α_S phases. Based on the analysis of crack growth paths and slip traces, it is considered that basal slip provides a favorable path for crack growth, while second-order pyramidal slip exhibits greater resistance to crack growth. Additionally, microplastic deformation occurs in the α phase at the crack tip, resulting in lattice rotation. The residual dislocations in the α phase at the crack tip indicate the existence of slip transfer. Meanwhile, the phase boundaries serve as both sources and barriers for dislocations, which may lead to crack propagation along the phase boundaries.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109209"},"PeriodicalIF":6.8,"publicationDate":"2025-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780246","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":"Unitary phenomenological approach to the fatigue crack growth curve based on the analytical definition of the a-N curve","authors":"A. Fernández-Canteli ,&nbsp;D. Díaz-Salamanca ,&nbsp;E. Castillo ,&nbsp;S. Blasón ,&nbsp;M. Muñiz-Calvente","doi":"10.1016/j.ijfatigue.2025.109207","DOIUrl":"10.1016/j.ijfatigue.2025.109207","url":null,"abstract":"<div><div>A phenomenological unitary methodology is applied for the analytical deduction of the Fatigue Crack Growth Rate (<span><math><mrow><mi>F</mi><mi>C</mi><mi>G</mi><mi>R</mi></mrow></math></span>) curve. It encompasses: First, the analytical definition of the <span><math><mrow><mi>a</mi><mo>-</mo><mi>N</mi></mrow></math></span> curve from the data recorded in the crack growth test, identified as a Weibull cumulative distribution function (cdf) by applying the <em>retro</em>-extrapolation (REX) model. Second, the identification of the <span><math><mrow><mi>F</mi><mi>C</mi><mi>G</mi><mi>R</mi></mrow></math></span> data as a relation between the <span><math><mrow><mi>da</mi><mo>/</mo><mi>d</mi><mi>N</mi><mo>-</mo><mi>a</mi></mrow></math></span> curve and the conventional expression of the maximum stress intensity factor, <span><math><msub><mi>K</mi><mi>M</mi></msub></math></span>, as combining the stress condition, crack length and specimen geometry. Lastly, the identification of the normalized <span><math><mrow><mi>da</mi><mo>/</mo><mi>d</mi><mi>N</mi><mo>-</mo><msub><mi>K</mi><mi>M</mi></msub><mspace></mspace></mrow></math></span> curve, as a Gumbel cdf, according to the model of Castillo et al. The methodology thus applied ensures an improved estimation of both lower and higher asymptotic values, <span><math><msub><mi>K</mi><mrow><mi>M</mi><mo>,</mo><mi>t</mi><mi>h</mi></mrow></msub></math></span> and <span><math><msub><mi>K</mi><mrow><mi>M</mi><mo>,</mo><mi>u</mi><mi>p</mi></mrow></msub></math></span>, respectively, and a more reliable definition of the <span><math><mrow><mi>da</mi><mo>/</mo><mi>d</mi><mi>N</mi><mo>-</mo><msub><mi>K</mi><mi>M</mi></msub></mrow></math></span> curve, even outside the monitored test data. In this way, a robust fatigue crack propagation characterization of the material is achieved for lifetime prediction of components and structures in the damage tolerance design. The satisfactory fit obtained from external crack growth results proves the suitability of the procedure in the solution of this kind of mechanism of failure.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109207"},"PeriodicalIF":6.8,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780250","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 investigation and analytical modeling of crack initiation and propagation in Ti–6Al–4V under low-cycle fatigue conditions on microscale","authors":"Christopher M. Wuensch","doi":"10.1016/j.ijfatigue.2025.109148","DOIUrl":"10.1016/j.ijfatigue.2025.109148","url":null,"abstract":"<div><div>Ti alloys such as Ti–6Al–4V belong to a group of materials that show tremendous potential in aircraft engine construction due to their mechanical properties and corrosion resistance. However, not only the knowledge of the material properties are relevant, but also a comprehensive understanding of the damage mechanisms that occur. One of the most relevant types of damage mechanisms is caused by the cyclic loading, as this accounts for more than 70% of the economically relevant damages, not only in the construction and operation of gas turbines. The objective of this study is he characterization of the crack growth behavior under low-cycle fatigue conditions on a phenomenological and mathematical-analytical level. In-situ LCF fatigue measurements revealed that favorable crack initiation due to slip band formation and propagation sites are located within <span><math><mi>β</mi></math></span> phases and at grain boundaries in Ti–6Al–4V. Crack closure and merging effects resulted in single but critical crack that lead to failure. In addition, the energetical investigation with elasto-plastic strain response showed a continuous increase in absorbed energy as consequence to formation of crack surfaces. The determination of crack growth rates completed the analytical investigation and enabled a full size modeling revealing advantages and potential of optimization of existing model.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"202 ","pages":"Article 109148"},"PeriodicalIF":6.8,"publicationDate":"2025-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780248","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":"Multiaxial fatigue behavior and modeling for additive manufactured Ti-6Al-4V: The effect of surface texture","authors":"Seungjong Lee ,&nbsp;Reza Molaei ,&nbsp;Patricio E. Carrion ,&nbsp;Shuai Shao ,&nbsp;Nima Shamsaei","doi":"10.1016/j.ijfatigue.2025.109205","DOIUrl":"10.1016/j.ijfatigue.2025.109205","url":null,"abstract":"<div><div>The rough surface texture of unmachined specimens produced by the laser powder bed fusion (L-PBF) technique can significantly reduce their fatigue strength. Accurate measurement of surface topography is essential for obtaining reliable surface roughness parameters to enable quantitative comparisons and fatigue life estimations. A hybrid surface roughness parameter, previously proposed for uniaxial fatigue scenarios, linking surface texture with the fatigue strength of L-PBF materials, has been adopted to estimate the effect of surface texture on the multiaxial fatigue behavior of L-PBF Ti-6Al-4V alloy. Surface topographies are thoroughly measured using an optical microscope and X-ray computed tomography, and the outcomes of the two techniques are compared. Multiaxial fatigue results are analyzed using three different fatigue models. The surface texture-based fatigue life estimation approach is then combined with these three models to estimate the fatigue strength of different surface texture conditions under multiaxial loading. The results indicate that while the surface texture-based fatigue life estimation approach was originally developed for uniaxial loads, it could be extended to torsion as well as combined axial-torsion stress states. It was also found that the approach works only when the appropriate multiaxial fatigue life estimation model, consistent with the failure mechanism of the material, is utilized.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109205"},"PeriodicalIF":6.8,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144766965","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":"Occurrence and evolution of slip markings in a single phase BCC α-iron and a low carbon steel during very high cycle fatigue regime","authors":"Danièle Wagner,&nbsp;Johann Petit","doi":"10.1016/j.ijfatigue.2025.109206","DOIUrl":"10.1016/j.ijfatigue.2025.109206","url":null,"abstract":"<div><div>In the Very High Cycle Fatigue (VHCF) domain, as in Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF) domains, the failure of components by fatigue always begins by a damage stage followed by the stages of crack initiation and crack propagation (short and long crack). The duration of each stage depends on the stress amplitude. During the damage stage, the dislocations structure evolves depending on the crystal structure, which leads to the occurrence of Persistent Slip Bands (PSB) in FCC metals or Slip Markings (SM) in BCC metals. However in the VHCF domain, for low enough stress amplitude, no PSB/SM occurs, even after 10⁹–10¹⁰ cycles. In this work, fatigue tests are performed on α-iron (with a 0.008 wt% carbon content) and low carbon steel (with a 0.028 wt% carbon content) flat specimens thanks to a piezoelectric machine running at 20 kHz in continuous mode. The occurrence of SM is followed during the test with an optical camera focused on the central zone of the specimen, where the displacement is close to zero. When the stress amplitude is lower than 40 to 50 % of the lower Yield Stress, no SM is detected. In the initiation and short crack propagation stages, few SM are observed on the specimen surface in well oriented grains. In the long crack propagation stage, SM are visible on all grains near the fracture surface.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109206"},"PeriodicalIF":6.8,"publicationDate":"2025-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749434","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":"Peening methods for AISI 4140 steel to induce stable compressive residual stress against cyclic axial loading","authors":"Tomofumi Aoki ,&nbsp;Motoaki Hayama ,&nbsp;Shoichi Kikuchi ,&nbsp;Jun Komotori","doi":"10.1016/j.ijfatigue.2025.109200","DOIUrl":"10.1016/j.ijfatigue.2025.109200","url":null,"abstract":"<div><div>In this study, fine-particle peening (FPP) and shot peening (SP) were performed with a maximum compressive residual stress (CRS) of approximately − 650 MPa for AISI 4140 steels to increase the fatigue strength. The CRS stability during the fatigue process was analyzed using <em>in situ</em> X-ray stress measurements under axial compression-tension loading. The hardened layer formed via peening stabilized the CRS against cyclic axial loading, with fatigue strength at the 10⁷th cycle. This occurs because the increased local yield strength prevents localized compressive yielding caused by the superposition of the compressive loading and residual stresses. Although peening induced a CRS in a region deeper than the hardened layer, the CRS below the hardened layer was relaxed by a compressive stress loading lower than that on the surface, reducing the CRS stability in the hardened layer. This is because the compressive loading caused local compressive yielding below the hardened layer and resulted in stress redistribution. SP induced remarkable CRS deeper than the hardened layer, while FPP induced it mainly in the surface layer. Compared to SP, FPP increased the fatigue strength at the 10⁷th cycle by approximately 50 MPa and maintained a high CRS during fatigue testing with axial tension–compression loading and a stress amplitude of 700 MPa. The CRS stability and fatigue properties under axial loading were the most improved when the hardened layer with high yield strength was formed via FPP, and the peak CRS location was within the hardened layer.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109200"},"PeriodicalIF":6.8,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749431","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":"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}

{"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}

{"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}

{"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}