An Improved Nonlinear Cumulative Damage Model Considering the Influence of Load Sequence and Its Experimental Verification

Applied Sciences

Jianmin Li¹  Huanguo Chen¹  Wei Wang¹  Jun Pan¹  Wenhua Chen¹ 

[1] National and Local Joint Engineering Research Center of Reliability Analysis and Testing for Mechanical and Electrical Products, Zhejiang Sci-Tech University, Hangzhou 310018, China;

关键词: nonlinear cumulative damage;    loading sequence;    fatigue damage;    toughness dissipation;    two-level loading;   

DOI  :  10.3390/app11156944

来源: DOAJ

【 摘 要 】

According to the change characteristics in the toughness of the metal material during the fatigue damage process, the fatigue tests were carried out with the standard 18CrNiMo7-6 material. Scanning the fracture with an electron microscope explains the lack of linear cumulative damage in the mechanism. According to the obtained results, a nonlinear damage accumulation model which considered the loading sequence state under the toughness dissipation model was established. The recursive formula was devised under two-level. The fatigue test data verification of three metal materials showed that using this model to predict fatigue life is satisfactory and suitable for engineering applications.

【 授权许可】

Unknown