TY - JOUR
T1 - A safe fracture fatigue life prediction based on equivalent initial flaw size
AU - Li, Fei
AU - Wen, Zhixun
AU - Wu, Ziyan
AU - Liu, Shuangbo
AU - Li, Zhenwei
AU - Pei, Haiqing
AU - Yue, Zhufeng
N1 - Publisher Copyright:
© 2020
PY - 2021/1
Y1 - 2021/1
N2 - 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.
AB - 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.
KW - Crack propagation
KW - EIFS
KW - Safe fracture fatigue life
KW - Stress intensity factor
KW - TiAlNb-based alloy
KW - Total fatigue life prediction
UR - http://www.scopus.com/inward/record.url?scp=85091475953&partnerID=8YFLogxK
U2 - 10.1016/j.ijfatigue.2020.105957
DO - 10.1016/j.ijfatigue.2020.105957
M3 - 文章
AN - SCOPUS:85091475953
SN - 0142-1123
VL - 142
JO - International Journal of Fatigue
JF - International Journal of Fatigue
M1 - 105957
ER -