Pub Date : 2025-02-24DOI: 10.1016/j.ijfatigue.2025.108889
Grant West , Wenjia Gu , David Walker , Derek H. Warner
Despite the critical importance of mechanical reliability in our modern economy, the prediction of fatigue failures remains a challenging endeavor. Traditional fatigue testing methods are not only slow and costly but also plagued by high variability, making it difficult to calibrate predictive models for real-world utilization. Towards addressing this challenge, we present a uniaxial mechanical fatigue testing concept that aims to increase testing throughput by more than an order of magnitude, while maintaining testing cost and consistency with popular standards, ASTM E466 and ISO 1099. After considering various concepts to enhance uniaxial fatigue testing throughput, we present a mechanical analysis of the most promising concept. A prototyped design was developed and demonstrated with 39 aluminum 6061-T6511 test specimens subjected to 2 million loading cycles. The performance of the prototype was assessed against the popular standards via numerous strain gauge measurements over the duration of the test and by comparing the failure distribution to a traditional MMPDS fatigue dataset. Ultimately, the prototyped high throughput design produced fatigue life data that was in general agreement with the traditional MMPDS dataset. To close, the authors present potential extensions and applications to the method.
{"title":"A stacked cylinder approach for standardized high-throughput uniaxial fatigue characterization","authors":"Grant West , Wenjia Gu , David Walker , Derek H. Warner","doi":"10.1016/j.ijfatigue.2025.108889","DOIUrl":"10.1016/j.ijfatigue.2025.108889","url":null,"abstract":"<div><div>Despite the critical importance of mechanical reliability in our modern economy, the prediction of fatigue failures remains a challenging endeavor. Traditional fatigue testing methods are not only slow and costly but also plagued by high variability, making it difficult to calibrate predictive models for real-world utilization. Towards addressing this challenge, we present a uniaxial mechanical fatigue testing concept that aims to increase testing throughput by more than an order of magnitude, while maintaining testing cost and consistency with popular standards, ASTM E466 and ISO 1099. After considering various concepts to enhance uniaxial fatigue testing throughput, we present a mechanical analysis of the most promising concept. A prototyped design was developed and demonstrated with 39 aluminum 6061-T6511 test specimens subjected to 2 million loading cycles. The performance of the prototype was assessed against the popular standards via numerous strain gauge measurements over the duration of the test and by comparing the failure distribution to a traditional MMPDS fatigue dataset. Ultimately, the prototyped high throughput design produced fatigue life data that was in general agreement with the traditional MMPDS dataset. To close, the authors present potential extensions and applications to the method.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108889"},"PeriodicalIF":5.7,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521223","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}
Pub Date : 2025-02-22DOI: 10.1016/j.ijfatigue.2025.108888
M. Abdelmoniem , B. Yagimli , M. Barkhoff , F. Duisen
Understanding the fatigue behaviour of natural rubber is crucial for designing rubber components such as chassis and motor mounts. These components experience multiaxial loading during operation, which affects both mechanical behaviour and lifetime, for instance, due to self-heating or strain-induced crystallisation. In this study, a new methodology is introduced to analyse the fatigue behaviour of natural rubber under multiaxial loading. The loading is applied to the rubber sample through rotating shear deformation. A straightforward experimental set-up is employed to perform fatigue tests, where parameters like deformation amplitude and stress ratio are predetermined using a simulation model. Using this model, two load ratios for the tests are set. With the same amplitude loading, a higher load ratio provides lifetime reinforcement. The predicted behaviour aligns with the literature on natural rubber. A thermomechanically coupled finite viscoelastic model is used to determine the surface and internal temperatures of the sample. The predicted surface temperature and forces show good agreement with experimental results. This methodology provides valuable insights into how temperature distribution, local stress variation, and the stress ratio impact mechanical behaviour and fatigue life.
{"title":"A new methodology for analysing the fatigue behaviour of filled natural rubber using rotating shear deformation experiments and FEM analysis","authors":"M. Abdelmoniem , B. Yagimli , M. Barkhoff , F. Duisen","doi":"10.1016/j.ijfatigue.2025.108888","DOIUrl":"10.1016/j.ijfatigue.2025.108888","url":null,"abstract":"<div><div>Understanding the fatigue behaviour of natural rubber is crucial for designing rubber components such as chassis and motor mounts. These components experience multiaxial loading during operation, which affects both mechanical behaviour and lifetime, for instance, due to self-heating or strain-induced crystallisation. In this study, a new methodology is introduced to analyse the fatigue behaviour of natural rubber under multiaxial loading. The loading is applied to the rubber sample through rotating shear deformation. A straightforward experimental set-up is employed to perform fatigue tests, where parameters like deformation amplitude and stress ratio are predetermined using a simulation model. Using this model, two load ratios for the tests are set. With the same amplitude loading, a higher load ratio provides lifetime reinforcement. The predicted behaviour aligns with the literature on natural rubber. A thermomechanically coupled finite viscoelastic model is used to determine the surface and internal temperatures of the sample. The predicted surface temperature and forces show good agreement with experimental results. This methodology provides valuable insights into how temperature distribution, local stress variation, and the stress ratio impact mechanical behaviour and fatigue life.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108888"},"PeriodicalIF":5.7,"publicationDate":"2025-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143474928","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}
Pub Date : 2025-02-20DOI: 10.1016/j.ijfatigue.2025.108875
Ayyappan Unnikrishna Pillai, Mohammad Masiur Rahaman
This article proposes a novel phase-field length scale insensitive model for fatigue failure in brittle materials. In the proposed model, we incorporate a necessary fatigue-related parameter to define the fatigue threshold energy as a function of the fracture strength and make the mechanical response of a material insensitive to the phase-field length scale. In the proposed model, we derive the governing partial differential equations by invoking the virtual power principle and assume constitutive relations for the thermodynamic fluxes on satisfying the thermodynamic laws. We provide a consistent derivation for determining the parameters that appear in the degradation function. We demonstrate the efficacy of the proposed model by generating phase-field length scale insensitive response in terms of crack length and maximum amplitude of load versus number of cycles for a few representative numerical examples, viz. a three-point bending test, a single-edge and a double-edge notched plate under low cycle fatigue. The numerical results highlight excellent insensitivity of the global mechanical response to the phase-field length scale parameter, validating the robustness of the proposed model. For numerical implementation, we have utilized an open-source finite element toolbox called Gridap, available in a high-performance programming language Julia, that facilitates third-party verification, promotes transparency and reproducibility, and sets a benchmark for efficient open-source code development in the scientific community.
{"title":"A phase-field length scale insensitive model for fatigue failure in brittle materials","authors":"Ayyappan Unnikrishna Pillai, Mohammad Masiur Rahaman","doi":"10.1016/j.ijfatigue.2025.108875","DOIUrl":"10.1016/j.ijfatigue.2025.108875","url":null,"abstract":"<div><div>This article proposes a novel phase-field length scale insensitive model for fatigue failure in brittle materials. In the proposed model, we incorporate a necessary fatigue-related parameter to define the fatigue threshold energy as a function of the fracture strength and make the mechanical response of a material insensitive to the phase-field length scale. In the proposed model, we derive the governing partial differential equations by invoking the virtual power principle and assume constitutive relations for the thermodynamic fluxes on satisfying the thermodynamic laws. We provide a consistent derivation for determining the parameters that appear in the degradation function. We demonstrate the efficacy of the proposed model by generating phase-field length scale insensitive response in terms of crack length and maximum amplitude of load versus number of cycles for a few representative numerical examples, viz. a three-point bending test, a single-edge and a double-edge notched plate under low cycle fatigue. The numerical results highlight excellent insensitivity of the global mechanical response to the phase-field length scale parameter, validating the robustness of the proposed model. For numerical implementation, we have utilized an open-source finite element toolbox called Gridap, available in a high-performance programming language Julia, that facilitates third-party verification, promotes transparency and reproducibility, and sets a benchmark for efficient open-source code development in the scientific community.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108875"},"PeriodicalIF":5.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143479434","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}
Great attention has been attached to Al-Li alloys due to their excellent performance for aerospace structural components, which endure low-temperature environments and cyclic loads, posing intense demands on the fatigue resistance of materials. In this work, the fatigue crack propagation (FCP) behaviors at low temperatures (−80 °C) of as-rolled 2195 Al-Li alloy have been investigated and compared with those at room temperature. It was found that the influence of grain boundaries and secondary phase particles on FCP is direction-dependent: both of them accelerate FCP in the parallel rolling direction (TL) and impede FCP in the perpendicular rolling direction (LT). Meanwhile, the grains with high Schmid factors have an attractive effect on the FCP path, but this effect diminishes at low temperature. The weakened dislocation movement at low temperature impedes cracks from entering the grains and propagating along the slip planes, resulting in crack deflection and propagation along grain boundaries. This mechanism retards the rate of FCP and significantly enhances the fatigue resistance of Al-Li alloys at low temperature.
{"title":"Fatigue crack propagation behavior of 2195 Al-Li alloy plate at low temperature","authors":"Yingzhi Li, Cunsheng Zhang, Zinan Cheng, Zijie Meng, Liang Chen, Guoqun Zhao","doi":"10.1016/j.ijfatigue.2025.108890","DOIUrl":"10.1016/j.ijfatigue.2025.108890","url":null,"abstract":"<div><div>Great attention has been attached to Al-Li alloys due to their excellent performance for aerospace structural components, which endure low-temperature environments and cyclic loads, posing intense demands on the fatigue resistance of materials. In this work, the fatigue crack propagation (FCP) behaviors at low temperatures (−80 °C) of as-rolled 2195 Al-Li alloy have been investigated and compared with those at room temperature. It was found that the influence of grain boundaries and secondary phase particles on FCP is direction-dependent: both of them accelerate FCP in the parallel rolling direction (TL) and impede FCP in the perpendicular rolling direction (LT). Meanwhile, the grains with high Schmid factors have an attractive effect on the FCP path, but this effect diminishes at low temperature. The weakened dislocation movement at low temperature impedes cracks from entering the grains and propagating along the slip planes, resulting in crack deflection and propagation along grain boundaries. This mechanism retards the rate of FCP and significantly enhances the fatigue resistance of Al-Li alloys at low temperature.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108890"},"PeriodicalIF":5.7,"publicationDate":"2025-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143471188","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}
Pub Date : 2025-02-18DOI: 10.1016/j.ijfatigue.2025.108870
Gabriele Bufalari, Niels Troost, Henk den Besten, Miroslaw Lech Kaminski
Facing multiaxial fatigue testing challenges with respect to non-proportional loading conditions, a custom-built hexapod has been used to establish the mode-{I, III} resistance characteristics of high-quality welds in steel maritime structures. Assessment of the hexapod test data using the effective notch stress and total stress, respectively the best performing multiaxial intact and cracked geometry parameters, shows a fit in the reference quality literature data scatter band and provides conservative lifetime estimates. In order to improve the lifetime estimate accuracy, strength, geometry, material and mechanism aspects are investigated. Welding induced residual stress, a strength aspect, predominantly affects the mode-I fatigue resistance including a mean (residual) stress contribution. The weld notch radius, a geometry parameter, primarily influences the mode-III fatigue resistance. Similar material microstructure compositions of the high-quality welds and reference quality ones are observed, implying comparable mode specific mechanism parameters for the effective notch stress and total stress, respectively the material characteristic length and elastoplasticity coefficient. The material microstructure properties and classification criteria for high-quality welds support the residual stress estimates and suggest a smaller welding induced defect size. In general, the high quality is mainly reflected in the larger resistance curve intercept and slope, another strength and mechanism parameter, implying a larger initiation contribution to the total lifetime. For a high-quality resistance curve involving the representative strength, geometry, material and mechanism contributions, more accurate lifetime estimates are obtained, even though the parameter confidence is reduced because of the relatively small data size in comparison to the reference quality one.
{"title":"Mode-{I, III} multiaxial fatigue testing of high-quality welds in steel maritime structures using a hexapod","authors":"Gabriele Bufalari, Niels Troost, Henk den Besten, Miroslaw Lech Kaminski","doi":"10.1016/j.ijfatigue.2025.108870","DOIUrl":"10.1016/j.ijfatigue.2025.108870","url":null,"abstract":"<div><div>Facing multiaxial fatigue testing challenges with respect to non-proportional loading conditions, a custom-built hexapod has been used to establish the mode-{I, III} resistance characteristics of high-quality welds in steel maritime structures. Assessment of the hexapod test data using the effective notch stress and total stress, respectively the best performing multiaxial intact and cracked geometry parameters, shows a fit in the reference quality literature data scatter band and provides conservative lifetime estimates. In order to improve the lifetime estimate accuracy, strength, geometry, material and mechanism aspects are investigated. Welding induced residual stress, a strength aspect, predominantly affects the mode-I fatigue resistance including a mean (residual) stress contribution. The weld notch radius, a geometry parameter, primarily influences the mode-III fatigue resistance. Similar material microstructure compositions of the high-quality welds and reference quality ones are observed, implying comparable mode specific mechanism parameters for the effective notch stress and total stress, respectively the material characteristic length and elastoplasticity coefficient. The material microstructure properties and classification criteria for high-quality welds support the residual stress estimates and suggest a smaller welding induced defect size. In general, the high quality is mainly reflected in the larger resistance curve intercept and slope, another strength and mechanism parameter, implying a larger initiation contribution to the total lifetime. For a high-quality resistance curve involving the representative strength, geometry, material and mechanism contributions, more accurate lifetime estimates are obtained, even though the parameter confidence is reduced because of the relatively small data size in comparison to the reference quality one.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"197 ","pages":"Article 108870"},"PeriodicalIF":5.7,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143592899","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}
Pub Date : 2025-02-16DOI: 10.1016/j.ijfatigue.2025.108887
Jonathan Jones , Alberto Gonzalez Garcia , Mark Whittaker , Robert Lancaster , Nicholas Barnard , Sean John , Joseph Doyle , Julian Mason-Flucke
Thermo-mechanical fatigue (TMF) is a complex damage mechanism considered to be one of the key issues limiting the service lives of hot section components in a gas turbine engine. Turbine blades and nozzle guide vanes are particularly susceptible to this form of material degradation, which results from the simultaneous cycling of mechanical and thermal loads. In this research, a series of TMF tests were undertaken on a single crystal nickel-based superalloy, CMSX-4 under a variety of phase angles and a thermal cycle of 550–1050 °C, to holistically understand the evolving damage mechanisms that can occur under the various loading conditions. The generated data has shown that for the strain ranges tested, fatigue life is significantly affected by the employed phase angle. Furthermore, the length of time that the material is exposed to elevated temperature has a substantial influence on the material’s microstructure, and thus, the dominant mode of damage that occurs.
{"title":"The influence of phase angle on the TMF crack initiation behaviour and damage mechanisms of a single-crystal superalloy","authors":"Jonathan Jones , Alberto Gonzalez Garcia , Mark Whittaker , Robert Lancaster , Nicholas Barnard , Sean John , Joseph Doyle , Julian Mason-Flucke","doi":"10.1016/j.ijfatigue.2025.108887","DOIUrl":"10.1016/j.ijfatigue.2025.108887","url":null,"abstract":"<div><div>Thermo-mechanical fatigue (TMF) is a complex damage mechanism considered to be one of the key issues limiting the service lives of hot section components in a gas turbine engine. Turbine blades and nozzle guide vanes are particularly susceptible to this form of material degradation, which results from the simultaneous cycling of mechanical and thermal loads. In this research, a series of TMF tests were undertaken on a single crystal nickel-based superalloy, CMSX-4 under a variety of phase angles and a thermal cycle of 550–1050 °C, to holistically understand the evolving damage mechanisms that can occur under the various loading conditions. The generated data has shown that for the strain ranges tested, fatigue life is significantly affected by the employed phase angle. Furthermore, the length of time that the material is exposed to elevated temperature has a substantial influence on the material’s microstructure, and thus, the dominant mode of damage that occurs.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"196 ","pages":"Article 108887"},"PeriodicalIF":5.7,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143521222","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}
Pub Date : 2025-02-15DOI: 10.1016/j.ijfatigue.2025.108884
Tonghui Wang, Yanrong Wang, Dasheng Wei
Multiaxial fatigue under complex asymmetric loading paths has gained significant attention because it better represents the actual loading conditions of engineering components. However, research on this topic remains limited. In this study, a definition of the multiaxial fatigue stress ratio is proposed by identifying the peak and valley points of complex loading paths. Subsequently, the Walker mean stress correction method is extended for application to multiaxial fatigue. By incorporating mean stress correction into an existing symmetric model, an improved asymmetric multiaxial fatigue model is developed without introducing additional fitting parameters. To validate the proposed model, 50 fatigue tests were conducted on TC4 alloy using 12 distinct loading paths with varying mean stresses and phase angles. The results show that the model accurately captures damage differences across various asymmetric loading paths. Most predicted fatigue lives fall within the 3±1 scatter band of the experimental data. The reliable prediction performance demonstrates that the proposed model can be effectively applied to multiaxial fatigue life prediction under asymmetric loading in engineering structures.
{"title":"Multiaxial fatigue of a titanium alloy under complex loading with asymmetric paths","authors":"Tonghui Wang, Yanrong Wang, Dasheng Wei","doi":"10.1016/j.ijfatigue.2025.108884","DOIUrl":"10.1016/j.ijfatigue.2025.108884","url":null,"abstract":"<div><div>Multiaxial fatigue under complex asymmetric loading paths has gained significant attention because it better represents the actual loading conditions of engineering components. However, research on this topic remains limited. In this study, a definition of the multiaxial fatigue stress ratio is proposed by identifying the peak and valley points of complex loading paths. Subsequently, the Walker mean stress correction method is extended for application to multiaxial fatigue. By incorporating mean stress correction into an existing symmetric model, an improved asymmetric multiaxial fatigue model is developed without introducing additional fitting parameters. To validate the proposed model, 50 fatigue tests were conducted on TC4 alloy using 12 distinct loading paths with varying mean stresses and phase angles. The results show that the model accurately captures damage differences across various asymmetric loading paths. Most predicted fatigue lives fall within the 3<sup>±1</sup> scatter band of the experimental data. The reliable prediction performance demonstrates that the proposed model can be effectively applied to multiaxial fatigue life prediction under asymmetric loading in engineering structures.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108884"},"PeriodicalIF":5.7,"publicationDate":"2025-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143444664","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}
Pub Date : 2025-02-12DOI: 10.1016/j.ijfatigue.2025.108876
Morteza Kianifar , Mohammad Azadi , Fatemeh Heidari
This study presents the effect of immersion in Simulated Body Fluid (SBF) on the fatigue behavior of Polylactic Acid (PLA) and PLA-wood composites. For the degraded fatigue tests, the testing specimens were 28 days submersed in 10X SBF, weighed, and then fatigue experiments were done. The immersed samples gained weight due to water absorption. Additionally, mineral deposits grew on their external shells. The results indicate that PLA-wood composites exhibit a superior fatigue lifespan compared to pure PLA. The immersion in SBF notably decreased the fatigue lifespan of both PLA and PLA-wood composites. The scanning electron microscopy analysis revealed that pure PLA samples display brittle fracture characteristics. At the same time, PLA-wood composites showed signs of less brittle behavior compared to PLA, including micro-void formation and wood particle debonding.
{"title":"Effect of simulated body fluid on the fatigue resistance of 3D-printed PLA and PLA-wood structures under cyclic bending loading","authors":"Morteza Kianifar , Mohammad Azadi , Fatemeh Heidari","doi":"10.1016/j.ijfatigue.2025.108876","DOIUrl":"10.1016/j.ijfatigue.2025.108876","url":null,"abstract":"<div><div>This study presents the effect of immersion in Simulated Body Fluid (SBF) on the fatigue behavior of Polylactic Acid (PLA) and PLA-wood composites. For the degraded fatigue tests, the testing specimens were 28 days submersed in 10X SBF, weighed, and then fatigue experiments were done. The immersed samples gained weight due to water absorption. Additionally, mineral deposits grew on their external shells. The results indicate that PLA-wood composites exhibit a superior fatigue lifespan compared to pure PLA. The immersion in SBF notably decreased the fatigue lifespan of both PLA and PLA-wood composites. The scanning electron microscopy analysis revealed that pure PLA samples display brittle fracture characteristics. At the same time, PLA-wood composites showed signs of less brittle behavior compared to PLA, including micro-void formation and wood particle debonding.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108876"},"PeriodicalIF":5.7,"publicationDate":"2025-02-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422362","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}
This study investigated the fracture mechanisms of dovetail joints under very high cycle fretting fatigue (VHCFF) loading and predicted the short crack propagation behavior through experiment and simulation. Dovetail specimens designed and manufactured using Inconel 718 superalloy are tested at room temperature (RT) and high temperature (650 °C). The scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) are used to analyze the fracture surface morphology and microstructural features at crack initiation sites. A fretting fatigue indicator parameter (FFIP) is proposed with the help of crystal plasticity finite element (CPFE) method to predict the short crack path. The results show that: 1) Oxides generated on the wear surface at high temperature tend to initiate cracks; 2) The crack path at RT is affected by types of grain boundaries, Schmid factor, twist angle and tilt angle; 3) The crack path determined by FFIP shows an agreement with the experimentally observed short crack propagation behavior.
{"title":"Investigation of fretting fatigue performance for IN718 dovetail joint in very high cycle regime","authors":"Zeshuai Shen, Zhiyong Huang, Jian Wang, Liangqi Zheng, Hongjiang Qian, Qingyun Zhu","doi":"10.1016/j.ijfatigue.2025.108874","DOIUrl":"10.1016/j.ijfatigue.2025.108874","url":null,"abstract":"<div><div>This study investigated the fracture mechanisms of dovetail joints under very high cycle fretting fatigue (VHCFF) loading and predicted the short crack propagation behavior through experiment and simulation. Dovetail specimens designed and manufactured using Inconel 718 superalloy are tested at room temperature (RT) and high temperature (650 °C). The scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) are used to analyze the fracture surface morphology and microstructural features at crack initiation sites. A fretting fatigue indicator parameter (FFIP) is proposed with the help of crystal plasticity finite element (CPFE) method to predict the short crack path. The results show that: 1) Oxides generated on the wear surface at high temperature tend to initiate cracks; 2) The crack path at RT is affected by types of grain boundaries, Schmid factor, twist angle and tilt angle; 3) The crack path determined by FFIP shows an agreement with the experimentally observed short crack propagation behavior.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108874"},"PeriodicalIF":5.7,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422364","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}
Pub Date : 2025-02-10DOI: 10.1016/j.ijfatigue.2025.108852
G. Minerva , M. Awd , A. Koch , F. Walther , S. Beretta
Fatigue of metallic materials produced by Laser Powder Bed Fusion has been extensively studied for both standard testing specimens and application relevant components. However, fatigue properties of specimens and components suffer from large scatter, mainly due to the presence of volumetric anomalies, residual stresses and surface roughness. Therefore, the transferability from specimens to components is still an open point that must be addressed. In this work, fatigue properties of notched components are investigated and compared with the standard specimens. Then, the properties of the components are inferred from the standard specimens’ data using simple models. The maxima anomalies’ distributions are estimated with a competing risk approach using Machine learning-assisted Extreme Value Statistics. Finally, the S-N curves of the investigated components, predicted employing the Shiozawa model for finite life and the El-Haddad model for the fatigue limit, closely matched the experimental results.
{"title":"Transferability of anomaly data to fatigue properties of PBF-LB AlSi10Mg parts with different volumes","authors":"G. Minerva , M. Awd , A. Koch , F. Walther , S. Beretta","doi":"10.1016/j.ijfatigue.2025.108852","DOIUrl":"10.1016/j.ijfatigue.2025.108852","url":null,"abstract":"<div><div>Fatigue of metallic materials produced by Laser Powder Bed Fusion has been extensively studied for both standard testing specimens and application relevant components. However, fatigue properties of specimens and components suffer from large scatter, mainly due to the presence of volumetric anomalies, residual stresses and surface roughness. Therefore, the transferability from specimens to components is still an open point that must be addressed. In this work, fatigue properties of notched components are investigated and compared with the standard specimens. Then, the properties of the components are inferred from the standard specimens’ data using simple models. The maxima anomalies’ distributions are estimated with a competing risk approach using Machine learning-assisted Extreme Value Statistics. Finally, the S-N curves of the investigated components, predicted employing the Shiozawa model for finite life and the El-Haddad model for the fatigue limit, closely matched the experimental results.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108852"},"PeriodicalIF":5.7,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422363","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}
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