Modified Coffin-Manson equation to predict the fatigue life of structural materials subjected to mechanical-thermal coupling non-coaxial loading

作     者：Zhichao Ma Chaofan Li Wei Zhang Shenghui Wang Jiakai Li Hongwei Zhao Luquan Ren Zhichao Ma;Chaofan Li;Wei Zhang;Shenghui Wang;Jiakai Li;Hongwei Zhao;Luquan Ren

作者机构：School of Mechanical and Aerospace EngineeringJilin UniversityChangchun 130025China Key Laboratory of CNC Equipment ReliabilityMinistry of EducationJilin UniversityChangchun 130025China Key Laboratory of Bionic Engineering Ministry of EducationJilin UniversityChangchun 130025China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第160卷第29期

页      面：118-127页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：the National Natural Sci-ence Foundation of China(Nos.92266206 and 52227810) the Jilin Province Science and Technology Development Plan(No.YDZJ202101ZYTS129) the Fundamental Research Funds for the Central Universities(No.2022-JCXK-11) 

主　　题：Fatigue testing instrument Mechanical-thermal coupling Combined loading Fatigue life prediction odified Coffin-Manson equation 

摘      要：With regard to the structures subjected to severe mechanical-thermal coupling fatigue conditions,the consistency between service conditions and loading conditions was the prerequisite for the fatigue prop-erties test and fatigue life prediction.A miniature piezoelectric-driven instrument integrating with a tripodal piezoelectric actuator and envelope-type heating function was developed to investigate the mechanical-thermal coupling fatigue properties and obtain the fatigue life of materials under approximate service conditions.A physical model was described to quantitatively calculate the alternating deformation under the mechanical-thermal coupling tensile-bending combined ***,a fatigue life prediction method based on the Coffin-Manson equation under tensile-bending combined loading was proposed to estimate the mechanical-thermal coupling fatigue life in terms of the total coupling defor-mation and plastic strain *** feasibility of the proposed instrument was verified through the analysis of displacement responses of high entropy alloy specimens under the thermal-mechanical cou-pling tensile-bending combined condition at temperatures ranging from RT to 600°*** comparison between fatigue lives directly measured through thermal-mechanical coupling experiments and theoreti-cally predicted fatigue lives indicated the availability of the modified Coffin-Manson equation.