{"title":"Comparison of critical plane models for multiaxial fatigue life prediction","authors":"Yevhenii Savchuk, S. Shukayev","doi":"10.20535/2521-1943.2023.7.3.287522","DOIUrl":null,"url":null,"abstract":"Background. The operation of numerous machines and units takes place under conditions of multi-axial cyclic loading, which, as a rule, is non-proportional. Evaluating the fatigue durability of metal alloys under conditions of multi-axial non-proportional loading is a relevant task in modern engineering. Solving this problem requires fatigue calculation methods that would consider operating conditions and properties of structural materials, including factors such as the type of stress state, loading trajectory, material sensitivity to non-proportional loading, and so on.Objective. To conduct a comparative analysis of a range of fatigue life models based on the concept of the critical plane, including the Fatemi-Socie, Wang-Brown, Smith-Watson-Topper, Liu I, and Liu II approaches, and to identify the limits and peculiarities of their application.Methods. The fatigue lives calculated using the selected models were compared with experimental results obtained for various metal alloys subjected to uniaxial tension-compression, alternating torsion, and proportional and non-proportional multiaxial loading.Results. The applicability limits of fatigue life models based on the critical plane concept were analyzed for different metal alloys under conditions of proportional and non-proportional multiaxial loading.Conclusions. The research results demonstrated that models requiring the use of material constants obtained from tests in both tension-compression and alternating torsion provide reliable fatigue life estimates for various types of metal alloys. Calculations based solely on fatigue curves from alternating torsion better correlate with the results of tests on ductile materials, while calculations based on criteria utilizing fatigue curves from tension-compression align more closely with results from tests on brittle materials.","PeriodicalId":32423,"journal":{"name":"Mechanics and Advanced Technologies","volume":"62 1","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2023-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Mechanics and Advanced Technologies","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.20535/2521-1943.2023.7.3.287522","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 0
Abstract
Background. The operation of numerous machines and units takes place under conditions of multi-axial cyclic loading, which, as a rule, is non-proportional. Evaluating the fatigue durability of metal alloys under conditions of multi-axial non-proportional loading is a relevant task in modern engineering. Solving this problem requires fatigue calculation methods that would consider operating conditions and properties of structural materials, including factors such as the type of stress state, loading trajectory, material sensitivity to non-proportional loading, and so on.Objective. To conduct a comparative analysis of a range of fatigue life models based on the concept of the critical plane, including the Fatemi-Socie, Wang-Brown, Smith-Watson-Topper, Liu I, and Liu II approaches, and to identify the limits and peculiarities of their application.Methods. The fatigue lives calculated using the selected models were compared with experimental results obtained for various metal alloys subjected to uniaxial tension-compression, alternating torsion, and proportional and non-proportional multiaxial loading.Results. The applicability limits of fatigue life models based on the critical plane concept were analyzed for different metal alloys under conditions of proportional and non-proportional multiaxial loading.Conclusions. The research results demonstrated that models requiring the use of material constants obtained from tests in both tension-compression and alternating torsion provide reliable fatigue life estimates for various types of metal alloys. Calculations based solely on fatigue curves from alternating torsion better correlate with the results of tests on ductile materials, while calculations based on criteria utilizing fatigue curves from tension-compression align more closely with results from tests on brittle materials.
背景。许多机器和设备都是在多轴循环载荷条件下运行的,而这种载荷通常是非比例载荷。评估金属合金在多轴非比例载荷条件下的疲劳耐久性是现代工程中的一项相关任务。要解决这一问题,就需要考虑结构材料的工作条件和特性,包括应力状态类型、加载轨迹、材料对非比例加载的敏感性等因素的疲劳计算方法。对一系列基于临界面概念的疲劳寿命模型进行比较分析,包括 Fatemi-Socie、Wang-Brown、Smith-Watson-Topper、Liu I 和 Liu II 方法,并确定其应用的局限性和特殊性。将所选模型计算出的疲劳寿命与各种金属合金在单轴拉伸-压缩、交变扭转、比例和非比例多轴载荷作用下的实验结果进行比较。分析了基于临界面概念的疲劳寿命模型在比例和非比例多轴载荷条件下对不同金属合金的适用极限。研究结果表明,需要使用从拉伸-压缩和交变扭转试验中获得的材料常数的模型可为各类金属合金提供可靠的疲劳寿命估算。完全基于交变扭转疲劳曲线的计算结果与韧性材料的测试结果更接近,而基于利用拉伸压缩疲劳曲线标准的计算结果与脆性材料的测试结果更接近。