Study on Fatigue Life Prediction of TC4-DT Structural Simulants by Using Critical Distance Theory

作     者：Taiyu Piao Xiaoan Hu Taiyu Piao;Xiaoan Hu

作者机构：College of Aircraft Power Engineering Nanchang Hangkong University Nanchang China 

出 版 物：《World Journal of Engineering and Technology》 (世界工程和技术（英文）)

年 卷 期：2024年第12卷第2期

页      面：320-338页

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）] 

主　　题：Notched Fatigue Critical Distance Stress Concentration Stress Gradient 

摘      要：In the actual engineering of the structure, mechanical notch is inevitable, which will significantly reduce the fatigue life of the structure. In order to ensure the application of notch structures in engineering, the accurate evaluation of the impact of notch on fatigue life has become the basis of fatigue reliability design of structures. To investigate the influence of the concave structure on the overall fatigue life in practical engineering, three different sizes of V-notch parts and concave structure simulation parts were designed, and the life prediction was carried out by using the critical distance method. The results show that the stress gradient of the concave structure with the same stress concentration coefficient is much greater than that of the V-notch structure. Considering the notch effect, the S-T model in the critical distance method is modified by the stress concentration coefficient and stress gradient, and it is found that the life prediction accuracy reaches the ideal.