A safe fracture fatigue life prediction based on equivalent initial flaw size

Fei Li, Zhixun Wen, Ziyan Wu, Shuangbo Liu, Zhenwei Li, Haiqing Pei, Zhufeng Yue

科研成果: 期刊稿件文章同行评审

10 引用 (Scopus)

摘要

The equivalent initial flaw size (EIFS) concept was developed to provide an initial damage state for fracture mechanics-based life prediction. This study focuses on the safe fracture fatigue life prediction based on EIFS concept. A novel assessment method (M-K-T), the maximum likelihood estimation (MLE) method updated by modified Kitagawa-Takahashi (K-T) diagram method, is proposed to obtain general EIFS distribution and further predict the total fatigue life. The accuracy of the prediction method is proved by the fatigue crack propagation test of Ti2AlNb-based alloy under five different temperature (R.T., 200 °C, 400 °C, 500 °C, and 600 °C). Based on total fatigue life and uncertain damage mapping, the probability function of safe fracture fatigue life is derived considering the errors of experimental measurement and theoretical derivation.

源语言英语
文章编号105957
期刊International Journal of Fatigue
142
DOI
出版状态已出版 - 1月 2021

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