硬质金属材料多轴高周疲劳寿命快速预测方法  

A fast life prediction method for hard metals under multiaxial high-cycle fatigue loading

作　　者：刘天奇 张广鑫 张田 刘浩[2] 亓新新 时新红[3] LIU Tianqi;ZHANG Guangxin;ZHANG Tian;LIU Hao;QI Xinxin;SHI Xinhong(Beijing Key Laboratory of Civil Aircraft Structures and Composite Materials,COMAC Beijing Aircraft Technology Research Institute,Beijing 102211,P.R.China;College of Aerospace and Astronautics,Chongqing University,Chongqing 400044,P.R.China;Institute of Solid Mechanics,School of Aeronautic Science and Engineering,Beihang University(BUAA),Beijing 100191,P.R.China)

机构地区：[1]中国商飞北京民用飞机技术研究中心民用飞机结构与复合材料北京市重点实验室,北京102211 [2]重庆大学航空航天学院,重庆400044 [3]北京航空航天大学航空科学与工程学院,北京100191

出　　处：《重庆大学学报》2023年第3期94-102,共9页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(11172021)。

摘　　要：在对30CrMnSiA钢多轴疲劳寿命研究的基础上,基于单轴拉压和纯扭S-N曲线,提出了等效S-N曲线的概念。基于等效S-N曲线,建立了预测硬质金属材料多轴疲劳寿命的经验公式。采用该公式对文献中的多种硬质金属材料进行了寿命预测,预测结果显示94.0%以上的数据点均处于±3倍疲劳寿命分散带之内,81.8%以上的数据点处于±2倍疲劳寿命分散带之内。According to the study of multiaxial fatigue life of 30CrMnSiA steel,the concept of equivalent S-N curve is proposed based on the uniaxial tension-compression and pure torsion S-N curves in this paper.Based on the equivalent S-N curves,an empirical formula is established to predict the multiaxial fatigue life of hard metal materials.The empirical formula is verified by predicting the fatigue life of various hard metal materials in the literature.Results show that more than 94.0%of the data points are in the±3 times fatigue life scatter band,and more than 81.8%of the data points are in the±2 times fatigue life scatter band.

关 键 词：多轴疲劳 应力幅比 相位差 S-N曲线 

分 类 号：O346.2[理学—固体力学]