Finite Element Analysis on the Crack Growth and Stress Intensity Factor for the Contact Fatigue

International Conference on Materials Sciences and Nanomaterials

材料科学;物理学

Du, P.X.^1,3,4 ; Liang, Y.L.^1,3,4 ; Yin, C.H.^2,3,4 ; Zhong, L.Q.^2,3,4 ; Fan, H.J.^1,3,4

College of Materials and Metallurgy, Guizhou University, Guiyang, Guizhou, China^1

School of Mechanical Engineering, Guizhou University, Guiyang, Guizhou, China^2

Guizhou Key Laboratory for Mechanical Behavior and Micro Structure of Mateials, Guizhou University, China^3

Natl. and Loc. Jt. Eng. Lab. for High-Perf. Metal Struct. Mat. and Advanced Manufacturing Technology, China^4

关键词: Contact fatigues;    Crack growth life;    Crack tip stress intensity factor;    Fatigue crack profiles;    Fatigue cracks;    Load condition;    Rolling contacts;    Three-dimensional contact;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/230/1/012038/pdf
DOI  :  10.1088/1757-899X/230/1/012038

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

In order to simulate contact fatigue crack propagation, the ANSYS APDL and Franc3D were used. The rolling contact model was established by the ANSYS APDL, then the distribution of the contact stress field under various loads was analyzed. The contact stress value demonstrated an error within ± 6%, compared to the obtained results from the Hertz theory. The contact stress field was imported into the Franc3D with a preset radical crack, the crack tip stress intensity factor distribution was calculated and the growth path of the three-dimensional contact fatigue cracks was analyzed. The comparisons with the experimental results demonstrated that the fatigue crack profile path from the peeling position of the subcutaneous layer was consistent with the simulated path, which was in a circular arc form. The main reason for this result was the fatigue crack change from the opening type I to the sliding type II. The a-N curves of the crack growth life under various load conditions were predicted based on the Franc3D, whereas the results displayed that the crack growth life decreased as the compressive stress increased.