Prediction method of rotating-bending fatigue life of 40CrNi2Si2MoVA steel specimens after machining and shot peening

• Main Authors: XU Mingbo, LIU Hongfei, GAO Yukui
• Format: Article
• Language: zho
• Published: Journal of Aeronautical Materials 2020-02-01
• Series: Journal of Aeronautical Materials
• Subjects: 40crni2si2mova steel; fatigue life prediction; shot peening; fe-safe
• Online Access: http://jam.biam.ac.cn/article/doi/10.11868/j.issn.1005-5053.2019.000033
• ISSN: 1005-5053; 1005-5053

In order to predict the rotating-bending fatigue life of 40CrNi2Si2MoVA steel specimens after machining and shot peening in room temperature, the applicability and accuracy of different numerical calculation methods were compared by combining the commercial finite element software ABAQUS with the fatigue life analysis software FE-SAFE, the empirical formula for predicting the life of 40CrNi2Si2MoVA steel strengthened by shot peening was presented. The results show that using "Brown-Miller" algorithm and surface residual stress in FE-SAFE can obtain a relatively precise prediction result for machined specimens. And for shot peened specimens, this method also can be taken in high stress level. While the "stress-based Brown Miller" algorithm and maximum residual stress are more suitable for shot peened specimens in low stress level. The empirical formula σmax =–64.378•lg N + 1449.268 proposed based on the two methods can enhance the accuracy of fatigue life prediction of 40CrNi2Si2MoVA steel shot peened specimens.