International Journal of Fatigue最新文献_第8页

Fretting fatigue strength evaluation of scaled press-fitted railway axle containing a circumferential groove defect

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-24 DOI: 10.1016/j.ijfatigue.2025.108824

Yihui Dong , Dongfang Zeng , Hai Zhao , Pingbo Wu , Ye Song , Xiang Li , Liantao Lu

Fretting fatigue cracks can occur in the wheel seat of railway axles, posing a risk to safe operation. This study investigates the critical crack depth that ensures the fatigue strength of railway axles remains within acceptable limits. Fretting fatigue tests were performed on scaled press-fitted axles with circumferential groove defects of varying depths. Results showed that as the defect depth increased, the fretting fatigue strength decreased. An elastoplastic FE simulation model was developed based on these experimental findings, analyzing both conditions with and without fretting wear. The analysis revealed that the failed specimen, compared to the non-failed one with the same defect depth, exhibited at least a 5 % increase in maximum stress at the crack initiation point and over a 10 % increase in the high-stress region due to higher nominal stress. When fretting wear-induced profile changes were considered, crack initiation could be predicted using a modified wöhler curve method (MWCM) and critical plane method. To simplify engineering simulations, an FE model without fretting wear was used, with a coefficient K = 1.133 ± 0.1 determined from published experimental data. Combining this coefficient with the MWCM criterion, the critical defect size under allowable stress conditions was predicted, yielding results in close agreement with experimental data.

{"title":"Fretting fatigue strength evaluation of scaled press-fitted railway axle containing a circumferential groove defect","authors":"Yihui Dong , Dongfang Zeng , Hai Zhao , Pingbo Wu , Ye Song , Xiang Li , Liantao Lu","doi":"10.1016/j.ijfatigue.2025.108824","DOIUrl":"10.1016/j.ijfatigue.2025.108824","url":null,"abstract":"<div><div>Fretting fatigue cracks can occur in the wheel seat of railway axles, posing a risk to safe operation. This study investigates the critical crack depth that ensures the fatigue strength of railway axles remains within acceptable limits. Fretting fatigue tests were performed on scaled press-fitted axles with circumferential groove defects of varying depths. Results showed that as the defect depth increased, the fretting fatigue strength decreased. An elastoplastic FE simulation model was developed based on these experimental findings, analyzing both conditions with and without fretting wear. The analysis revealed that the failed specimen, compared to the non-failed one with the same defect depth, exhibited at least a 5 % increase in maximum stress at the crack initiation point and over a 10 % increase in the high-stress region due to higher nominal stress. When fretting wear-induced profile changes were considered, crack initiation could be predicted using a modified wöhler curve method (MWCM) and critical plane method. To simplify engineering simulations, an FE model without fretting wear was used, with a coefficient K = 1.133 ± 0.1 determined from published experimental data. Combining this coefficient with the MWCM criterion, the critical defect size under allowable stress conditions was predicted, yielding results in close agreement with experimental data.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108824"},"PeriodicalIF":5.7,"publicationDate":"2025-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Machine learning model for predicting the influence of crystallographic orientation on thermomechanical fatigue of Ni-base superalloys

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-23 DOI: 10.1016/j.ijfatigue.2025.108832

Rohan Acharya , Alexander N. Caputo , Richard W. Neu

Ni-base superalloys used in gas turbine blades are often directionally-solidified (DS) or single-crystal (SX) to minimize grain boundaries and enhance creep resistance. However, their anisotropic elastic properties cause significant variability in mechanical response depending on the loading direction, particularly for components with complex geometries. Predicting thermomechanical fatigue (TMF) and creep-fatigue life across different crystallographic orientations is challenging due to numerous influencing parameters. This work extends a previously developed probabilistic physics-guided neural network (PPgNN), originally limited to

〈 001 〉

orientations, by incorporating a normalized elastic modulus as a physics-informed input to account for crystallographic orientation. The model further includes transverse loading in DS alloys. For the first time, a general PPgNN framework predicts both cycles to failure and life variance, integrating critical parameters such as strain range, temperature extremes, dwell durations, cyclic frequency, TMF phasing, and crystallographic orientation. Unlike existing empirical models, which address only a subset of these factors, the proposed approach unifies all key parameters within a single framework. Physics-informed feature engineering, combined with a novel loss function and constrained neural network architecture, enables robust generalization from sparse datasets, providing reliable life predictions across all orientations and test conditions.

{"title":"Machine learning model for predicting the influence of crystallographic orientation on thermomechanical fatigue of Ni-base superalloys","authors":"Rohan Acharya , Alexander N. Caputo , Richard W. Neu","doi":"10.1016/j.ijfatigue.2025.108832","DOIUrl":"10.1016/j.ijfatigue.2025.108832","url":null,"abstract":"<div><div>Ni-base superalloys used in gas turbine blades are often directionally-solidified (DS) or single-crystal (SX) to minimize grain boundaries and enhance creep resistance. However, their anisotropic elastic properties cause significant variability in mechanical response depending on the loading direction, particularly for components with complex geometries. Predicting thermomechanical fatigue (TMF) and creep-fatigue life across different crystallographic orientations is challenging due to numerous influencing parameters. This work extends a previously developed probabilistic physics-guided neural network (PPgNN), originally limited to <span><math><mrow><mo>〈</mo><mn>001</mn><mo>〉</mo></mrow></math></span> orientations, by incorporating a normalized elastic modulus as a physics-informed input to account for crystallographic orientation. The model further includes transverse loading in DS alloys. For the first time, a general PPgNN framework predicts both cycles to failure and life variance, integrating critical parameters such as strain range, temperature extremes, dwell durations, cyclic frequency, TMF phasing, and crystallographic orientation. Unlike existing empirical models, which address only a subset of these factors, the proposed approach unifies all key parameters within a single framework. Physics-informed feature engineering, combined with a novel loss function and constrained neural network architecture, enables robust generalization from sparse datasets, providing reliable life predictions across all orientations and test conditions.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108832"},"PeriodicalIF":5.7,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077751","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of compressive residual stress and surface morphology introduced by shot peening on the improvement of fretting fatigue life of TC4

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-23 DOI: 10.1016/j.ijfatigue.2025.108835

Xiyuan Zhang , Dasheng Wei , Xiang Liu , Jiayu Xiao , Shun Yang

Fretting fatigue is a common phenomenon between contacting components that significantly reduces the life of the specimen due to stress concentration and surface wear. Shot peening is a widely used surface strengthening technique that improves fatigue life by introducing surface hardening and residual stress fields. This study employed a bridge-type pad and flat specimen test setup to investigate the effects of fretting and shot peening under tensile loads ranging from 250 MPa to 850 MPa. Finite element simulations modeled the shot peening process and fretting behavior, incorporating surface morphology changes and near-surface residual stress distributions using a Python script. The Chaboche material constitutive model and ABAQUS subroutines were used to calculate the stress–strain evolution of the specimens under different numbers of cycles. The results indicate that fretting induces significant stress concentration and relative slip at the edges of the contact zone, reducing the fatigue life to only 26.3 % to 58.7 % of that in conventional fatigue. For the shot-peened specimens, the asperities formed on the surface influence the stress concentration and relative sliding distance, while the introduction of residual stresses significantly increases the fatigue life by a factor of 1.38 to 6.72. Finally, based on the characteristics of the fretting stress distribution and the features of the shot-peened specimens, a life prediction model was proposed for fretting fatigue, taking into account the stress gradient across the cross-section. Over 90 % of the data points fall within a 1.5x scatter band.

{"title":"Effect of compressive residual stress and surface morphology introduced by shot peening on the improvement of fretting fatigue life of TC4","authors":"Xiyuan Zhang , Dasheng Wei , Xiang Liu , Jiayu Xiao , Shun Yang","doi":"10.1016/j.ijfatigue.2025.108835","DOIUrl":"10.1016/j.ijfatigue.2025.108835","url":null,"abstract":"<div><div>Fretting fatigue is a common phenomenon between contacting components that significantly reduces the life of the specimen due to stress concentration and surface wear. Shot peening is a widely used surface strengthening technique that improves fatigue life by introducing surface hardening and residual stress fields. This study employed a bridge-type pad and flat specimen test setup to investigate the effects of fretting and shot peening under tensile loads ranging from 250 MPa to 850 MPa. Finite element simulations modeled the shot peening process and fretting behavior, incorporating surface morphology changes and near-surface residual stress distributions using a Python script. The Chaboche material constitutive model and ABAQUS subroutines were used to calculate the stress–strain evolution of the specimens under different numbers of cycles. The results indicate that fretting induces significant stress concentration and relative slip at the edges of the contact zone, reducing the fatigue life to only 26.3 % to 58.7 % of that in conventional fatigue. For the shot-peened specimens, the asperities formed on the surface influence the stress concentration and relative sliding distance, while the introduction of residual stresses significantly increases the fatigue life by a factor of 1.38 to 6.72. Finally, based on the characteristics of the fretting stress distribution and the features of the shot-peened specimens, a life prediction model was proposed for fretting fatigue, taking into account the stress gradient across the cross-section. Over 90 % of the data points fall within a 1.5x scatter band.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108835"},"PeriodicalIF":5.7,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077750","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low cycle fatigue and creep-fatigue interaction behavior of C630R ferritic/martensitic heat-resistant steel at high temperature

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-23 DOI: 10.1016/j.ijfatigue.2025.108836

Kailun Ding , Zhengxin Tang , Xikou He , Xitao Wang , Jinshan He

The low-cycle fatigue (LCF) and creep-fatigue interaction (CFI) characteristics of 630R ferritic/martensitic heat-resistant steel at 630 °C have been examined. The LCF tests were conducted within a strain range of 0.3 % to 1.0 %. CFI assessments were conducted using trapezoidal waveforms with varying strain amplitudes and load holding durations. The progression of cyclic stress, hysteresis curves, stress relaxation behavior, fracture mechanism, and microstructure evolution during LCF and CFI loading was analyed. The findings suggest that C630R heat-resistant steel displays significant cyclic softening behavior during both low-cycle fatigue and creep-fatigue testing. In the low-cycle fatigue test, the extent of softening enhance with upper strain amplitudes, the introduction of hold time further accelerates this softening. Increased strain amplitudes during low-cycle fatigue (LCF) testing led to a higher number of crack initiation points (the cracking sources are 2 and 5 at 0.6 % and 1.0 % strain amplitudes, respectively). Fatigue fracture still the vital failure pattern under varying load-holding times, with extended load-holding durations promoting crack propagation, an increased presence of creep voids is observed. The interaction between fatigue and creep effects becomes more evident, which results in the shortening of fatigue lifespan. Under cyclic loading conditions, the martensitic lath structure experiences recovery, which results in cyclic softening. As either the increase of load-holding time and strain amplitude, the microstructure exhibits more uniform coarsening, with the lath structure gradatim transforming into uniform dislocation cell structure. Furthermore, a prominent W-Laves phase developed during the creep-fatigue tests, with the Laves phase increasing in coarsen as the loading period was prolonged.

{"title":"Low cycle fatigue and creep-fatigue interaction behavior of C630R ferritic/martensitic heat-resistant steel at high temperature","authors":"Kailun Ding , Zhengxin Tang , Xikou He , Xitao Wang , Jinshan He","doi":"10.1016/j.ijfatigue.2025.108836","DOIUrl":"10.1016/j.ijfatigue.2025.108836","url":null,"abstract":"<div><div>The low-cycle fatigue (LCF) and creep-fatigue interaction (CFI) characteristics of 630R ferritic/martensitic heat-resistant steel at 630 °C have been examined. The LCF tests were conducted within a strain range of 0.3 % to 1.0 %. CFI assessments were conducted using trapezoidal waveforms with varying strain amplitudes and load holding durations. The progression of cyclic stress, hysteresis curves, stress relaxation behavior, fracture mechanism, and microstructure evolution during LCF and CFI loading was analyed. The findings suggest that C630R heat-resistant steel displays significant cyclic softening behavior during both low-cycle fatigue and creep-fatigue testing. In the low-cycle fatigue test, the extent of softening enhance with upper strain amplitudes, the introduction of hold time further accelerates this softening. Increased strain amplitudes during low-cycle fatigue (LCF) testing led to a higher number of crack initiation points (the cracking sources are 2 and 5 at 0.6 % and 1.0 % strain amplitudes, respectively). Fatigue fracture still the vital failure pattern under varying load-holding times, with extended load-holding durations promoting crack propagation, an increased presence of creep voids is observed. The interaction between fatigue and creep effects becomes more evident, which results in the shortening of fatigue lifespan. Under cyclic loading conditions, the martensitic lath structure experiences recovery, which results in cyclic softening. As either the increase of load-holding time and strain amplitude, the microstructure exhibits more uniform coarsening, with the lath structure gradatim transforming into uniform dislocation cell structure. Furthermore, a prominent W-Laves phase developed during the creep-fatigue tests, with the Laves phase increasing in coarsen as the loading period was prolonged.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108836"},"PeriodicalIF":5.7,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A comprehensive analysis of fatigue in wood and wood products

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-22 DOI: 10.1016/j.ijfatigue.2025.108807

Changxi Yang , Mostafa Abdelrahman , Ani Khaloian-Sarnaghi , Jan-Willem van de Kuilen

Fatigue failures pose significant challenges across various engineering disciplines. Wood, due to its low carbon emissions and high strength-to-weight ratio, has been gaining attention in engineering applications. The fatigue behavior of wood is complex due to its heterogeneous, anisotropic, and viscoelastic nature. This research explores essential insights into the fatigue behavior of wood, with a focus on S–N curves, stress–strain behavior, and failure mechanisms. Due to often varying failure criteria and test settings, direct comparison of S–N curves across different studies can be challenging and inconclusive. A closer look shows that wood in fatigue shows both irreversible and recoverable strain components that are delayed. However, there have been conflicting reports about residual stiffness changes under fatigue loading. Theoretical fatigue life models based on S–N curves or duration of load theory have shown limited applicability. Efforts to develop progressive damage model based on stress–strain behaviors have been challenging and largely unsuccessful due to the lack or inconsistency of data. Understanding the microstructural failure mechanism is crucial in order to build a more trustworthy fatigue modeling technique. Further work is suggested to monitor the microstructural deterioration during high-cycle fatigue loading.

{"title":"A comprehensive analysis of fatigue in wood and wood products","authors":"Changxi Yang , Mostafa Abdelrahman , Ani Khaloian-Sarnaghi , Jan-Willem van de Kuilen","doi":"10.1016/j.ijfatigue.2025.108807","DOIUrl":"10.1016/j.ijfatigue.2025.108807","url":null,"abstract":"<div><div>Fatigue failures pose significant challenges across various engineering disciplines. Wood, due to its low carbon emissions and high strength-to-weight ratio, has been gaining attention in engineering applications. The fatigue behavior of wood is complex due to its heterogeneous, anisotropic, and viscoelastic nature. This research explores essential insights into the fatigue behavior of wood, with a focus on S–N curves, stress–strain behavior, and failure mechanisms. Due to often varying failure criteria and test settings, direct comparison of S–N curves across different studies can be challenging and inconclusive. A closer look shows that wood in fatigue shows both irreversible and recoverable strain components that are delayed. However, there have been conflicting reports about residual stiffness changes under fatigue loading. Theoretical fatigue life models based on S–N curves or duration of load theory have shown limited applicability. Efforts to develop progressive damage model based on stress–strain behaviors have been challenging and largely unsuccessful due to the lack or inconsistency of data. Understanding the microstructural failure mechanism is crucial in order to build a more trustworthy fatigue modeling technique. Further work is suggested to monitor the microstructural deterioration during high-cycle fatigue loading.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108807"},"PeriodicalIF":5.7,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mechanisms of fatigue crack growth in 7050-T6 aluminium alloy

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-21 DOI: 10.1016/j.ijfatigue.2025.108830

L.P. Borrego , J.S. Jesus , R. Branco , J.A.M. Ferreira , F.V. Antunes , D.M. Neto , E.R. Sérgio

Fatigue crack growth (FCG) is usually associated with cyclic plastic deformation at the crack tip. However, this damage mechanism loses dominance for relatively low stress intensity factor ranges (ΔK), and a lower boundary must be considered in numerical modelling. So far, the definition of this lower boundary and its variation with the stress ratio remain unclear This paper studies FCG in CT specimens made of 7050-T6 aluminium alloy, submitted to different load ratios. A multi-linear behavior was observed in Paris law regime, independently of stress ratio. SEM analysis showed that ductile striations are observed at high ΔK, while at low ΔK a cleavage mechanism is observed. A numerical analysis was developed, assuming the dominance of cyclic plastic deformation, which overestimated the experimental results obtained for low ΔK. The comparison of the size of cyclic plastic zone, r_pc, with the grain size, ρ, indicated that plastic deformation loses dominance when r_pc < ρ.

{"title":"Mechanisms of fatigue crack growth in 7050-T6 aluminium alloy","authors":"L.P. Borrego , J.S. Jesus , R. Branco , J.A.M. Ferreira , F.V. Antunes , D.M. Neto , E.R. Sérgio","doi":"10.1016/j.ijfatigue.2025.108830","DOIUrl":"10.1016/j.ijfatigue.2025.108830","url":null,"abstract":"<div><div>Fatigue crack growth (FCG) is usually associated with cyclic plastic deformation at the crack tip. However, this damage mechanism loses dominance for relatively low stress intensity factor ranges (<em>ΔK</em>), and a lower boundary must be considered in numerical modelling. So far, the definition of this lower boundary and its variation with the stress ratio remain unclear This paper studies FCG in CT specimens made of 7050-T6 aluminium alloy, submitted to different load ratios. A multi-linear behavior was observed in Paris law regime, independently of stress ratio. SEM analysis showed that ductile striations are observed at high <em>ΔK</em>, while at low <em>ΔK</em> a cleavage mechanism is observed. A numerical analysis was developed, assuming the dominance of cyclic plastic deformation, which overestimated the experimental results obtained for low Δ<em>K</em>. The comparison of the size of cyclic plastic zone, <em>r<sub>pc</sub></em>, with the grain size, <em>ρ,</em> indicated that plastic deformation loses dominance when <em>r<sub>pc</sub></em> < <em>ρ</em>.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108830"},"PeriodicalIF":5.7,"publicationDate":"2025-01-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Assessment of binder test methods for detecting cracking susceptibility in asphalt mixtures

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-20 DOI: 10.1016/j.ijfatigue.2025.108827

Hui Chen , Dheeraj Adwani , Namuundari Zorigtbaatar , Fujie Zhou , Pravat Karki

Asphalt binders are crucial in roadway construction, significantly influencing the performance and durability of asphalt mixtures. Even with identical mix designs, the performance of these mixtures can vary depending on the Performance Grade (PG) of the binder used. This study aims to identify and evaluate test methods for assessing binder quality, specifically in terms of cracking resistance. Twenty binder samples, representing four PGs (PG 64–22, PG 64–28, PG 70–22, and PG 76–22), were selected for failure and rheological testing. These binders were incorporated into asphalt mixtures, which were then evaluated for cracking resistance using the IDEAL cracking test (IDEAL-CT).

The findings revealed significant correlations among ΔTc, R-value, poker chip stiffness, phase angle, and Glover–Rowe parameters. Specifically, the phase angle at 25 °C and 10 rad/s and the G-R parameter at 35 °C and 10 rad/s showed strong correlations with the CT_index (R² = 0.82 and 0.88, respectively), while poker chip stiffness also demonstrated a notable correlation (R² = 0.61). Although using the G-R parameter to derive VECD damage curves improved the correlation between N_f and CT_index (R² = 0.46), it was less effective than other parameters. Therefore, the phase angle at 25 °C and 10 rad/s is recommended as it can be easily obtained through standard PG grading tests. Additionally, the comparison of the phase angle with the IDEAL-CT test parameters indicated that the ductility of asphalt mixtures is closely linked to the binder’s phase angle. The strong correlations between asphaltenes and phase angle emphasizes the essence of phase angle in mixture cracking and failure mechanisms.

{"title":"Assessment of binder test methods for detecting cracking susceptibility in asphalt mixtures","authors":"Hui Chen , Dheeraj Adwani , Namuundari Zorigtbaatar , Fujie Zhou , Pravat Karki","doi":"10.1016/j.ijfatigue.2025.108827","DOIUrl":"10.1016/j.ijfatigue.2025.108827","url":null,"abstract":"<div><div>Asphalt binders are crucial in roadway construction, significantly influencing the performance and durability of asphalt mixtures. Even with identical mix designs, the performance of these mixtures can vary depending on the Performance Grade (PG) of the binder used. This study aims to identify and evaluate test methods for assessing binder quality, specifically in terms of cracking resistance. Twenty binder samples, representing four PGs (PG 64–22, PG 64–28, PG 70–22, and PG 76–22), were selected for failure and rheological testing. These binders were incorporated into asphalt mixtures, which were then evaluated for cracking resistance using the IDEAL cracking test (IDEAL-CT).</div><div>The findings revealed significant correlations among ΔTc, R-value, poker chip stiffness, phase angle, and Glover–Rowe parameters. Specifically, the phase angle at 25 °C and 10 rad/s and the G-R parameter at 35 °C and 10 rad/s showed strong correlations with the CT<sub>index</sub> (R<sup>2</sup> = 0.82 and 0.88, respectively), while poker chip stiffness also demonstrated a notable correlation (R<sup>2</sup> = 0.61). Although using the G-R parameter to derive VECD damage curves improved the correlation between N<sub>f</sub> and CT<sub>index</sub> (R<sup>2</sup> = 0.46), it was less effective than other parameters. Therefore, the phase angle at 25 °C and 10 rad/s is recommended as it can be easily obtained through standard PG grading tests. Additionally, the comparison of the phase angle with the IDEAL-CT test parameters indicated that the ductility of asphalt mixtures is closely linked to the binder’s phase angle. The strong correlations between asphaltenes and phase angle emphasizes the essence of phase angle in mixture cracking and failure mechanisms.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108827"},"PeriodicalIF":5.7,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiaxial fatigue model describing crack growth behavior and its application in welded structures of railway frames

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-20 DOI: 10.1016/j.ijfatigue.2025.108831

Zhe Zhang, Bing Yang, Feng Feng, Shiqi Zhou, Long Yang, Shoune Xiao, Guangwu Yang

Welded joints are typically key regions for crack initiation and propagation, making it especially important to study their fatigue behavior under different loading conditions. This study extends the classic mode I Christopher-James-Patterson (CJP) model and proposes a multiaxial CJP model tailored for welded structures. The study incorporates parameters that drive and resist crack propagation, defining the equivalent stress intensity factor K_CJP-eq for mixed-mode cracks. I + II mixed-mode fatigue crack growth experiments were conducted on as-welded and post-weld heat treatment specimens under different loading angles. Digital image correlation techniques were used to obtain displacement field data at the crack tip, and the improved multiaxial CJP model was applied to accurately calculate the crack propagation driving parameters. The results indicate that the improved multiaxial CJP model effectively accounts for residual stress effects, with the largest deviation in K_CJP-eq due to residual stresses in the early stages of crack propagation being 10.89 %. Furthermore, for the as-welded specimens, the maximum error with the theoretical value occurs at a loading angle of 30°, reaching 2.89°.

{"title":"Multiaxial fatigue model describing crack growth behavior and its application in welded structures of railway frames","authors":"Zhe Zhang, Bing Yang, Feng Feng, Shiqi Zhou, Long Yang, Shoune Xiao, Guangwu Yang","doi":"10.1016/j.ijfatigue.2025.108831","DOIUrl":"10.1016/j.ijfatigue.2025.108831","url":null,"abstract":"<div><div>Welded joints are typically key regions for crack initiation and propagation, making it especially important to study their fatigue behavior under different loading conditions. This study extends the classic mode I Christopher-James-Patterson (CJP) model and proposes a multiaxial CJP model tailored for welded structures. The study incorporates parameters that drive and resist crack propagation, defining the equivalent stress intensity factor <em>K<sub>CJP-eq</sub></em> for mixed-mode cracks. I + II mixed-mode fatigue crack growth experiments were conducted on as-welded and post-weld heat treatment specimens under different loading angles. Digital image correlation techniques were used to obtain displacement field data at the crack tip, and the improved multiaxial CJP model was applied to accurately calculate the crack propagation driving parameters. The results indicate that the improved multiaxial CJP model effectively accounts for residual stress effects, with the largest deviation in <em>K<sub>CJP-eq</sub></em> due to residual stresses in the early stages of crack propagation being 10.89 %. Furthermore, for the as-welded specimens, the maximum error with the theoretical value occurs at a loading angle of 30°, reaching 2.89°.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108831"},"PeriodicalIF":5.7,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049828","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Controllable kilohertz impact fatigue loading functioned by cyclic stress wave of Hopkinson tension bar and its application for TC4 titanium alloy

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-19 DOI: 10.1016/j.ijfatigue.2025.108828

Jianping Yin , Chenxu Zhang , Ruoheng Sun , Yilun Hu , Yinggang Miao , Yulong Li

Engineering materials are occasionally subjected to high-frequency impact fatigue in service. However, there are still gaps in the loading techniques that hinder the acquisition of sufficient experimental data. In this work, we developed a novel loading methodology based on stress wave guidance to achieve controllable impact fatigue of ∼ 1 kHz frequency. Hopkinson tension bar was modified first by introducing a highly mismatched wave impedance ratio of the incident bar over specimen, ensuring nearly total reflection of the incident stress waves and thereby generating successive stress waves to perform impact fatigue loading on specimen. Each unloading process was governed by specimen recovery within loading interval. Case study was conducted by experimenting TC4 titanium alloy at the frequency of 1,048 Hz. Meanwhile, each strain, stress and strain rate are measurable during loading and recovery cycle. Finally, the comparison with the results from non-impact fatigue of 5 Hz revealed that, at high stress amplitudes, the impact fatigue life of high-frequency is lower than that of the low-frequency non-impact fatigue. Both crack initiation and propagation mechanisms are influenced by load amplitude and frequency.

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引用次数: 0

Microstructure and fatigue life prediction of centrifugal investment casting IN713C alloy supercharger turbine

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-19 DOI: 10.1016/j.ijfatigue.2025.108823

Yanyun Sun , Huarui Zhang , Fuwei Wang , Shoubin Zhang , Rui Zhang , Junpin Lin , Ying Cheng , Hu Zhang

This study quantified the relationship between the microstructural characteristics and the fatigue life of the IN713C alloy turbocharger turbines prepared using centrifugal investment casting. The samples were obtained directly from the components for fatigue testing experiments to reveal the fatigue fracture mechanisms of different microstructures. The results showed that fatigue cracks at the root of centrifugal casting turbocharger turbine blades frequently originated from crystallographic facets with the highest Schmidt Factor in the {111} [1–10] slip system parallel to the loading direction. The presence of coarse strip-like carbides promoted the formation of secondary cracks, while the fine dendritic structure appeared to impede the propagation of fatigue striations and facilitate changes in their direction. In contrast, minor casting defects had a negligible impact on the initiation and propagation of cracks. The results of the feature selection using machine learning indicated that the secondary dendrite arm space (SDAS) and carbide size were crucial for the fatigue life with the low micropores. A fatigue life prediction model based on microstructural characteristics was developed using the traditional Basquin model. The method enables the rapid assessment of the fatigue performance of centrifugal casting turbine blades, which is significant for the safety evaluation of turbocharger turbine components.

{"title":"Microstructure and fatigue life prediction of centrifugal investment casting IN713C alloy supercharger turbine","authors":"Yanyun Sun , Huarui Zhang , Fuwei Wang , Shoubin Zhang , Rui Zhang , Junpin Lin , Ying Cheng , Hu Zhang","doi":"10.1016/j.ijfatigue.2025.108823","DOIUrl":"10.1016/j.ijfatigue.2025.108823","url":null,"abstract":"<div><div>This study quantified the relationship between the microstructural characteristics and the fatigue life of the IN713C alloy turbocharger turbines prepared using centrifugal investment casting. The samples were obtained directly from the components for fatigue testing experiments to reveal the fatigue fracture mechanisms of different microstructures. The results showed that fatigue cracks at the root of centrifugal casting turbocharger turbine blades frequently originated from crystallographic facets with the highest Schmidt Factor in the {111} [1–10] slip system parallel to the loading direction. The presence of coarse strip-like carbides promoted the formation of secondary cracks, while the fine dendritic structure appeared to impede the propagation of fatigue striations and facilitate changes in their direction. In contrast, minor casting defects had a negligible impact on the initiation and propagation of cracks. The results of the feature selection using machine learning indicated that the secondary dendrite arm space (SDAS) and carbide size were crucial for the fatigue life with the low micropores. A fatigue life prediction model based on microstructural characteristics was developed using the traditional Basquin model. The method enables the rapid assessment of the fatigue performance of centrifugal casting turbine blades, which is significant for the safety evaluation of turbocharger turbine components.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108823"},"PeriodicalIF":5.7,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143049831","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0