{"title":"Influence of polymer properties and fiber–matrix interface on the kink band initiation in compression-compression fatigue loading of continuous fiber reinforced plastics","authors":"Andreas Baumann, Joachim Hausmann","doi":"10.1016/j.ijfatigue.2025.109191","DOIUrl":"10.1016/j.ijfatigue.2025.109191","url":null,"abstract":"<div><div>Continuous fiber reinforced laminates have been investigated in much detail for their quasi-static compressive failure behavior. Numerous failure modes like fiber buckling, kink banding, delaminations and splitting are described. Kink band formation takes on a special role because this failure mode is dependent on the properties of the matrix polymer. Not many experimental results can be found on the failure modes active in compression-compression (C–C) fatigue loading of these materials. This investigation addresses for the first time the influence of the polymer properties on the C–C failure laminates with unidirectional glass- and carbon fiber reinforcement. With the aim of broadly altering the polymer properties γ radiation of a Co-60 source is used as a final specimen preparation step for an epoxy system and polycarbonate. In addition, time dependent effects are investigated by comparing quasi-static loading to two different load signals (sinusoidal and trapezoidal stress-time signal). Notched specimens are used to target kink band formation exclusively. By additional fatigue tests in in-plane shear loading and quasi-static interlaminar shear tests, it was found that the interplay between the matrix-polymer and the fiber–matrix interface could drastically alter the resulting fatigue performance of a laminate.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109191"},"PeriodicalIF":5.7,"publicationDate":"2025-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713067","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}
Yuxuan Liu , Lvfeng Jiang , Xiang Xu , Yanan Hu , Xu Zhang , Zefeng Wen , Ping Wang , Qianhua Kan
{"title":"Temperature-dependent whole-life ratcheting of ER9 wheel steel: Experiments and modeling","authors":"Yuxuan Liu , Lvfeng Jiang , Xiang Xu , Yanan Hu , Xu Zhang , Zefeng Wen , Ping Wang , Qianhua Kan","doi":"10.1016/j.ijfatigue.2025.109175","DOIUrl":"10.1016/j.ijfatigue.2025.109175","url":null,"abstract":"<div><div>Monotonic tensile tests are conducted on ER9 wheel steel across a temperature range from 298 K to 873 K to obtain temperature-dependent mechanical properties. The results indicate a significant additional strengthening effect at approximately 573 K, which is attributed to the dynamic strain aging. Asymmetric stress-controlled fatigue tests are conducted at 298 K, 573 K, and 873 K to investigate the whole-life ratcheting, thereby indicating the evolution of ratcheting strain and damage. Based on experimental observations, a new cyclic plastic constitutive model is developed to capture the temperature-dependent evolutions of isotropic and kinematic hardenings. An exponential term is incorporated into the damage evolution equation to account for the observed differences in the evolution of damage variables at various temperatures. Consequently, a temperature-dependent damage-coupled cyclic constitutive model was established. A comparison between simulated and experimental results indicates that the proposed model accurately captures the whole-life ratcheting of ER9 wheel steel within the range of room temperature to high temperature. Moreover, the predicted fatigue lives fall within a twice-error<!--> <!-->band. The findings are expected to provide theoretical support for the thermo-mechanically coupled fatigue damage of wheel steel under severe creepage conditions.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109175"},"PeriodicalIF":5.7,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144703951","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}
A.O. Myhre , D. Wan , A. Sendrowicz , V. Olden , H. Matsunaga , A. Alvaro , A. Vinogradov
{"title":"Hydrogen enhanced fatigue crack growth rates in a vintage and a modern X65 pipeline steel","authors":"A.O. Myhre , D. Wan , A. Sendrowicz , V. Olden , H. Matsunaga , A. Alvaro , A. Vinogradov","doi":"10.1016/j.ijfatigue.2025.109186","DOIUrl":"10.1016/j.ijfatigue.2025.109186","url":null,"abstract":"<div><div>Given the potential of hydrogen as an energy carrier in achieving carbon neutrality, assessing the fatigue crack growth rate behaviour of new and vintage pipeline materials exposed to hydrogen<!--> <!-->for new or repurposing of<!--> <!-->existing infrastructure is vital. Fatigue crack growth rate (FCGR) curves were established under in-situ electrochemical hydrogen charging at 1 Hz, observing up to 10 times acceleration<!--> <!-->compared to air. Constant Δ<em>K</em> testing at 11 MPa·m<sup>0.5</sup>and 18 MPa·m<sup>0.5</sup> under varying frequencies (1 Hz, 0.1 Hz, and 0.01 Hz) was performed to investigate the frequency dependence of hydrogen accelerated FCGR. The acceleration factors (AF) were observed to vary significantly, with the modern steel exhibiting an AF of 6.3 at 0.01 Hz and Δ<em>K</em> of 11 MPa·m<sup>0.5</sup> and 22.9 at Δ<em>K</em> of 18 MPa·m<sup>0.5</sup>. The vintage material showed AFs of 1.5 and 30 under the same conditions, respectively. The increase in AF was associated with a larger fraction of quasi-cleavage fracture. Electron channelling contrast imaging revealed evidence of plastic deformation even in the accelerated regime. The findings indicate notable differences in fatigue behaviour influenced by the microstructure and hydrogen environment, consistent with previous research and providing insights into the feasibility of repurposing existing pipelines for hydrogen transport considering existing FCGR design curves.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109186"},"PeriodicalIF":6.8,"publicationDate":"2025-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720808","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}
Y Austernaud , M Novelli , T Grosdidier , P Bocher
{"title":"Enhancing fatigue performance of austenitic stainless steel via warm surface severe plastic deformation using surface mechanical attrition treatment","authors":"Y Austernaud , M Novelli , T Grosdidier , P Bocher","doi":"10.1016/j.ijfatigue.2025.109189","DOIUrl":"10.1016/j.ijfatigue.2025.109189","url":null,"abstract":"<div><div>The effects of warm Surface Severe Plastic Deformation (SSPD) performed via Surface Mechanical Attrition Treatment (SMAT) on the microstructure, hardness, and residual stress gradients, as well as the resulting fatigue properties of a 316L austenitic stainless steel were investigated. Machined samples were ultrasonically shot peened for 10 min at Room Temperature (RT), 523 K, and 773 K before undergoing rotating-bending fatigue tests to determine the endurance limit. The RT-SMATed sample, for which machining grooves are removed by the shot impacts, showed a superior fatigue limit endurance than machined samples (+25 %), with subsurface nucleation sites. The 523 K peened samples revealed a similar fatigue limit endurance accompanied by the same type of subsurface crack nucleation. Due to the increased roughness and expansion of surface stress raisers by pile-ups and surface oxidation, the nucleation of the fatigue cracks occurred at the extreme surface when SMAT was done at 773 K. Despite the surface nucleation, SMAT carried out at 773 K provided a superior endurance limit (+15 % compared to RT-SMAT). This improvement was attributed to the restored microstructure formed under 773 K peening, which stabilizes the introduced compressive residual stress, and to the deeper and lower tensile peak induced by warm SMAT. To support the interpretation of fatigue behaviour under varying mean stress conditions, a Goodman analysis was conducted, confirming the beneficial role of compressive residual stress introduced by warm peening on endurance limit improvement.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109189"},"PeriodicalIF":6.8,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144720807","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}
Jiguang Zhang , Wei Zhang , Zewen Gu , Gongqi Cao , Jianlin Liu
{"title":"A modified fatigue model for life prediction of austenitic stainless steel corrugated plate structures under cryogenic conditions considering martensitic transformation effects","authors":"Jiguang Zhang , Wei Zhang , Zewen Gu , Gongqi Cao , Jianlin Liu","doi":"10.1016/j.ijfatigue.2025.109190","DOIUrl":"10.1016/j.ijfatigue.2025.109190","url":null,"abstract":"<div><div>Austenitic stainless steel (ASS) is widely used in diverse engineering disciplines such as liquefied natural gas (LNG) membrane storage tanks. Its fatigue performance under cryogenic conditions is of critical importance, owing to the complex and highly nonlinear mechanical behavior exhibited at cryogenic temperatures. However, limited research has been conducted on the fatigue behavior of ASS at cryogenic temperatures, particularly concerning the influence of phase transformation, such as strain-induced martensitic transformation. In this study, the fatigue characteristics and martensitic transformation behavior of ASS under cryogenic conditions are systematically investigated. The martensitic transformation of 304L stainless steel at various temperatures under cyclic loading is experimentally measured and analyzed using the X-ray diffraction (XRD). Based on these results, a phase transformation model under cyclic loading is developed. Furthermore, a modified fatigue life prediction model is proposed by incorporating the effects of martensitic transformation and a temperature-dependent shift factor. The proposed model is validated through numerical simulations and experimental fatigue tests. This comprehensive validation underscores the coupled influence of temperature, phase transformation, and fatigue response, enabling more accurate fatigue life predictions for ASS components operating in cryogenic environments.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109190"},"PeriodicalIF":5.7,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144711727","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":"Machine learning-based fatigue life prediction of double-sided U-rib welded joints considering multiple factors","authors":"Zhiyu Jie, Hao Zheng, Lexin Zhang","doi":"10.1016/j.ijfatigue.2025.109187","DOIUrl":"10.1016/j.ijfatigue.2025.109187","url":null,"abstract":"<div><div>This study systematically developed and evaluated five machine learning models, Support Vector Regression (SVR), Gaussian Process Regression (GPR), Neural Network Regression (NNR), Least Squares Boosting (LSBoost), and Random Feature Kernel Ridge Regression (RF-KRR), to address the challenges of crack depth and remaining fatigue life predictions for single- and double-sided U-rib welded joints in orthotropic steel decks, considering multiple influencing factors. A high-fidelity finite element model was established to analyze fatigue crack growth through integrated simulation using ABAQUS and FRANC3D, incorporating input features such as nominal stress range, deck thickness, welding type, residual stress, and crack length, with crack depth and remaining life as output targets. The results show that the evolution laws of the crack aspect ratio differ significantly for single- and double-sided U-rib welded joints. Correlation analysis reveals a strong positive relationship between crack length and crack depth. In contrast, residual stress, crack length, and crack depth exhibit significant negative correlations with remaining life, whereas double-sided welds and increased deck thickness contribute positively to enhanced fatigue resistance. In terms of model performance, the GPR model exhibits the highest accuracy and generalization in crack depth prediction, while the NNR model outperforms others in fatigue life prediction. Accordingly, the GPR model is recommended for crack depth prediction, and the NNR model is identified as the most suitable for fatigue life prediction.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109187"},"PeriodicalIF":5.7,"publicationDate":"2025-07-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144713071","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}
Rongqiao Wang , Weihan Kong , Xi Liu , Gaoxiang Chen , Huanhuan Chen , Dianyin Hu , Jianxing Mao
{"title":"A physics-informed Bayesian neural network model for probabilistic prediction of fatigue crack growth rate at different temperatures","authors":"Rongqiao Wang , Weihan Kong , Xi Liu , Gaoxiang Chen , Huanhuan Chen , Dianyin Hu , Jianxing Mao","doi":"10.1016/j.ijfatigue.2025.109184","DOIUrl":"10.1016/j.ijfatigue.2025.109184","url":null,"abstract":"<div><div>A physics-informed Bayesian neural network (PIBNN) method is proposed for predicting the probabilistic model for fatigue crack growth rate (FCGR) and fatigue crack growth life (FCGL). First, the Bayesian neural network (BNN) is employed for the probabilistic prediction of FCGR. Subsequently, the physical FCGR model that accounts for temperature effects is integrated into the BNN model as a loss function to enhance the model’s generalization capability. The mean and dispersion errors of the predictions at different temperatures are less than 10% compared to the test data. The probabilistic prediction of FCGL is ultimately realized through the integration of PIBNN with a Markov chain, in which the state transition probability matrix characterizes the transition probabilities between dispersion states.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109184"},"PeriodicalIF":5.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144686014","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 fatigue damage evolution and crack recognition in low-cycle metal fatigue testing based on acoustic emission monitoring","authors":"Zhihai Hu , Keqin Ding , Jianfang Zhou , Guosong Wu","doi":"10.1016/j.ijfatigue.2025.109182","DOIUrl":"10.1016/j.ijfatigue.2025.109182","url":null,"abstract":"<div><div>Acoustic emission (AE) monitoring is employed to investigate the low-cycle fatigue damage behavior of Q235 steel under uniaxial tensile-compressive loading in this study. A strong correlation is revealed between the fatigue damage evolution and acoustic emission characteristic parameters. Here, there is a significant dependence of AE signal characteristics on the loading mode: the tensile unloading and compressive loading stages are the main acoustic emission sources, and the AE energy peaks as strain approaches zero. The peak acoustic emission energy, hysteresis curve area, and maximum axial tensile stress exhibit consistent trends during fatigue, effectively characterizing damage evolution across fatigue stages. Furthermore, microstructural evolution is explored by analyzing specimens subjected to corresponding fatigue cycles. By means of the aforementioned results, an AE energy-based recognition model is successfully developed, enabling accurate detection of millimeter-scale fatigue cracks. This model provides a reliable theoretical foundation for the online AE monitoring of low-cycle fatigue damage in metals.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109182"},"PeriodicalIF":6.8,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144749432","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}
Jiwei Geng , Qian Wang , Yugang Li , Feifei Wang , Peikang Xia , Huanhuan Sun , Mingliang Wang , Dong Chen , Haowei Wang
{"title":"Low-cycle fatigue damage mechanisms of in-situ TiB2 particles reinforced aluminum matrix composite","authors":"Jiwei Geng , Qian Wang , Yugang Li , Feifei Wang , Peikang Xia , Huanhuan Sun , Mingliang Wang , Dong Chen , Haowei Wang","doi":"10.1016/j.ijfatigue.2025.109183","DOIUrl":"10.1016/j.ijfatigue.2025.109183","url":null,"abstract":"<div><div>The large-strain controlled low-cycle fatigue (LCF) damage of particle-reinforced aluminum matrix composite was first studied, considering particle interfaces and slip bands. It is found that the LCF damage behavior of the composite was dominated by the mutual effects between soft matrix and hard particles. Local deformation mainly concentrated at the T-Al<sub>20</sub>Cu<sub>2</sub>Mn<sub>3</sub> dispersoids with larger aspect ratio, secondary phases and aligned TiB<sub>2</sub> particles due to local plastic incompatibility and stress concentration. These features are the main source of LCF damage and exhibit are strain amplitude dependence. At low strain amplitudes (< 0.8 %), the cyclic deformation is dominated by elastic strain. The crack initiation is greatly related to secondary phase cracking. At high strain amplitudes (≥ 0.8 %), the slip bands are prevalent in the matrix and the damage behavior of the composite is controlled by cyclic plastic deformation. The strengthening layer is generally formed around TiB<sub>2</sub> particles due to the formation of strain gradient at TiB<sub>2</sub>-Al interface, which increase the cracking resistance of TiB<sub>2</sub>-Al interface and depend on strain amplitudes. The correlative cyclic damage models were established based on microstructure evolution.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109183"},"PeriodicalIF":5.7,"publicationDate":"2025-07-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144694736","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}
Md Abu Jafor , Adam N. Swinney , Arief Yudhanto , Trevor J. Fleck
{"title":"Synergistic effects of process-driven thermo-physical characteristics on fracture toughness and fatigue behaviors of additively manufactured polymers","authors":"Md Abu Jafor , Adam N. Swinney , Arief Yudhanto , Trevor J. Fleck","doi":"10.1016/j.ijfatigue.2025.109174","DOIUrl":"10.1016/j.ijfatigue.2025.109174","url":null,"abstract":"<div><div>The thermo-physical characteristics of polymeric materials produced using fusion-based material extrusion (MEX) additive manufacturing (AM) are sensitive to variations in process parameters. These parameters affect the as-manufactured defects (void content), which are known to impact the fracture and fatigue performance. However, the synergistic effects of process-driven thermo-physical characteristics and void content on fracture toughness and fatigue crack growth in MEX polymers remains inconclusive. In this work, polylactic acid (PLA) was manufactured with varying raster orientations (0° and 90°) and infill densities (80%, 85%, 90%, 95%, and 100%, as a proxy for void content). A series of experiments evaluated how these parameters influence void content, and therefore temperature distribution and resultant fracture and fatigue properties. Fracture toughness and fatigue crack growth were evaluated using compact tension specimens (CTS) and digital image correlation (DIC) to assess crack tip plasticity. The results indicate MEX samples printed with an orientation of 90° from the intended crack propagation exhibited a degradation in fracture toughness and fatigue performance. This degradation is primarily due to interlayer fracture caused by the voids being oriented perpendicular to the applied load, rather than the extent of the void content. These findings enhance the understanding of the interaction of process-driven thermo-physical properties and damage tolerance.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"201 ","pages":"Article 109174"},"PeriodicalIF":6.8,"publicationDate":"2025-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144665173","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}