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

doi:10.1016/j.ijfatigue.2020.105957

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

School of Mechanics,Civil Engineering and Architecture

Northwestern Polytechnical University Xian
Xi'an University of Architecture and Technology

Research output: Contribution to journal › Article › peer-review

14 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 language	English
Article number	105957
Journal	International Journal of Fatigue
Volume	142
DOIs	https://doi.org/10.1016/j.ijfatigue.2020.105957
State	Published - Jan 2021

Keywords

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

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10.1016/j.ijfatigue.2020.105957

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title = "A safe fracture fatigue life prediction based on equivalent initial flaw size",

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.",

keywords = "Crack propagation, EIFS, Safe fracture fatigue life, Stress intensity factor, TiAlNb-based alloy, Total fatigue life prediction",

author = "Fei Li and Zhixun Wen and Ziyan Wu and Shuangbo Liu and Zhenwei Li and Haiqing Pei and Zhufeng Yue",

note = "Publisher Copyright: {\textcopyright} 2020",

year = "2021",

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doi = "10.1016/j.ijfatigue.2020.105957",

language = "英语",

volume = "142",

journal = "International Journal of Fatigue",

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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

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 - https://www.scopus.com/pages/publications/85091475953

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 -

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

Abstract

Keywords

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