Yangyang Yu, Yiyun Guo, Saisai Wang, Junshuang Cai, Han Wu, Yeheng Song, Shao-Shi Rui, Chengqi Sun
{"title":"高速列车铝合金及其焊接接头的疲劳失效机理和影响因素","authors":"Yangyang Yu, Yiyun Guo, Saisai Wang, Junshuang Cai, Han Wu, Yeheng Song, Shao-Shi Rui, Chengqi Sun","doi":"10.1016/j.ijfatigue.2024.108759","DOIUrl":null,"url":null,"abstract":"Aluminum alloy and its welded joint are widely used in high-speed trains, which are subjected to complex fatigue loadings in service. The fatigue failure mechanisms and influential factors for Base Metals (BMs) and Welding Metals (WMs) subjected to low cycle (dwell) fatigue (<ce:italic>R</ce:italic> = 0) and (very) high cycle fatigue (<ce:italic>R</ce:italic> = −1) loads were investigated. The development of cumulative strain in tension–tension low cycle (dwell) fatigue was attributed to “cyclic ratcheting effect”, which developed only when the applied maximum stress level is higher than the yield strength. In that condition, the cumulative strains continually developed and resulted in ductile fracture for BMs, but gradually converged to a finite value and resulted in fatigue fracture for WMs. Further, the dwell loading contributed to slowing down the development speed of cumulative strain and extending the fatigue life for BMs. Moreover, the welding processing reduced the (very) high cycle fatigue strengths and shortened the fatigue lives due to the introduction of welding defects, and a model replacing the nominal maximum stress by an equivalent one was proposed for modeling the impact of those defects on fatigue properties, which agrees with the <ce:italic>S</ce:italic>-<ce:italic>N</ce:italic> data.","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"12 1","pages":""},"PeriodicalIF":5.7000,"publicationDate":"2024-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Fatigue failure mechanisms and influential factors for aluminum alloy and its welded joint in a high-speed train\",\"authors\":\"Yangyang Yu, Yiyun Guo, Saisai Wang, Junshuang Cai, Han Wu, Yeheng Song, Shao-Shi Rui, Chengqi Sun\",\"doi\":\"10.1016/j.ijfatigue.2024.108759\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Aluminum alloy and its welded joint are widely used in high-speed trains, which are subjected to complex fatigue loadings in service. The fatigue failure mechanisms and influential factors for Base Metals (BMs) and Welding Metals (WMs) subjected to low cycle (dwell) fatigue (<ce:italic>R</ce:italic> = 0) and (very) high cycle fatigue (<ce:italic>R</ce:italic> = −1) loads were investigated. The development of cumulative strain in tension–tension low cycle (dwell) fatigue was attributed to “cyclic ratcheting effect”, which developed only when the applied maximum stress level is higher than the yield strength. In that condition, the cumulative strains continually developed and resulted in ductile fracture for BMs, but gradually converged to a finite value and resulted in fatigue fracture for WMs. Further, the dwell loading contributed to slowing down the development speed of cumulative strain and extending the fatigue life for BMs. Moreover, the welding processing reduced the (very) high cycle fatigue strengths and shortened the fatigue lives due to the introduction of welding defects, and a model replacing the nominal maximum stress by an equivalent one was proposed for modeling the impact of those defects on fatigue properties, which agrees with the <ce:italic>S</ce:italic>-<ce:italic>N</ce:italic> data.\",\"PeriodicalId\":14112,\"journal\":{\"name\":\"International Journal of Fatigue\",\"volume\":\"12 1\",\"pages\":\"\"},\"PeriodicalIF\":5.7000,\"publicationDate\":\"2024-12-07\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"International Journal of Fatigue\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://doi.org/10.1016/j.ijfatigue.2024.108759\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"ENGINEERING, MECHANICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"International Journal of Fatigue","FirstCategoryId":"88","ListUrlMain":"https://doi.org/10.1016/j.ijfatigue.2024.108759","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, MECHANICAL","Score":null,"Total":0}
Fatigue failure mechanisms and influential factors for aluminum alloy and its welded joint in a high-speed train
Aluminum alloy and its welded joint are widely used in high-speed trains, which are subjected to complex fatigue loadings in service. The fatigue failure mechanisms and influential factors for Base Metals (BMs) and Welding Metals (WMs) subjected to low cycle (dwell) fatigue (R = 0) and (very) high cycle fatigue (R = −1) loads were investigated. The development of cumulative strain in tension–tension low cycle (dwell) fatigue was attributed to “cyclic ratcheting effect”, which developed only when the applied maximum stress level is higher than the yield strength. In that condition, the cumulative strains continually developed and resulted in ductile fracture for BMs, but gradually converged to a finite value and resulted in fatigue fracture for WMs. Further, the dwell loading contributed to slowing down the development speed of cumulative strain and extending the fatigue life for BMs. Moreover, the welding processing reduced the (very) high cycle fatigue strengths and shortened the fatigue lives due to the introduction of welding defects, and a model replacing the nominal maximum stress by an equivalent one was proposed for modeling the impact of those defects on fatigue properties, which agrees with the S-N data.
期刊介绍:
Typical subjects discussed in International Journal of Fatigue address:
Novel fatigue testing and characterization methods (new kinds of fatigue tests, critical evaluation of existing methods, in situ measurement of fatigue degradation, non-contact field measurements)
Multiaxial fatigue and complex loading effects of materials and structures, exploring state-of-the-art concepts in degradation under cyclic loading
Fatigue in the very high cycle regime, including failure mode transitions from surface to subsurface, effects of surface treatment, processing, and loading conditions
Modeling (including degradation processes and related driving forces, multiscale/multi-resolution methods, computational hierarchical and concurrent methods for coupled component and material responses, novel methods for notch root analysis, fracture mechanics, damage mechanics, crack growth kinetics, life prediction and durability, and prediction of stochastic fatigue behavior reflecting microstructure and service conditions)
Models for early stages of fatigue crack formation and growth that explicitly consider microstructure and relevant materials science aspects
Understanding the influence or manufacturing and processing route on fatigue degradation, and embedding this understanding in more predictive schemes for mitigation and design against fatigue
Prognosis and damage state awareness (including sensors, monitoring, methodology, interactive control, accelerated methods, data interpretation)
Applications of technologies associated with fatigue and their implications for structural integrity and reliability. This includes issues related to design, operation and maintenance, i.e., life cycle engineering
Smart materials and structures that can sense and mitigate fatigue degradation
Fatigue of devices and structures at small scales, including effects of process route and surfaces/interfaces.