Prediction of Shape Change for Fatigue Crack in a Round Bar Using Three-Parameter Growth Circles

Applied Sciences

Yali Yang¹  Seokjae Chu¹  Hao Chen² 

[1] School of Mechanical Engineering, University of Ulsan, Ulsan 680-749, Korea;School of Mechanical and Automotive Engineering, Shanghai University of Engineering Science, Shanghai 201620, China;

关键词: fatigue crack growth;    surface crack;    crack shape change;    three-parameter model;   

DOI  :  10.3390/app9091751

来源: DOAJ

【 摘 要 】

The conventional method for predicting the shape change of a surface crack in a round bar simply utilizes the Paris-Erdogan law with the least squares method using a certain shape assumption with excessive constraints. In this paper, a three-parameter model for a round bar subjected to tension is developed with fewer shape assumption restraints by employing a fatigue crack growth circles method. The equivalent stress intensity factor $\Delta K_e$ based on both stress intensity factors along the current and new crack front is used to reduce the total number of increments. The results show that the proposed method has a good convergence speed and accurate prediction of crack shapes. The present method is validated by comparing the solution with other simulation solutions and experimental data.

【 授权许可】

Unknown