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

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

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.

Original languageEnglish
Article number105957
JournalInternational Journal of Fatigue
Volume142
DOIs
StatePublished - Jan 2021

Keywords

  • Crack propagation
  • EIFS
  • Safe fracture fatigue life
  • Stress intensity factor
  • TiAlNb-based alloy
  • Total fatigue life prediction

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