A unified prediction model for physically small crack and long crack growth based on modified CTOD

Wei Zhang; Lindong Chai; Luping Ren; Liang Cai

doi:10.1016/j.engfracmech.2022.108650

A unified prediction model for physically small crack and long crack growth based on modified CTOD

Wei Zhang^*
, Lindong Chai
, Luping Ren
, Liang Cai

^*Corresponding author for this work

School of Mathematics and Statistics

Beihang University
Shanghai Marine Diesel Engine Research Institute

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

26 Citations (Scopus)

Abstract

A unified model based on CTOD is proposed to calculate the growth rate of physically small crack (PSC) and long crack (LC). Firstly, an in-situ SEM testing under the single overload condition is performed to reveal that CTOD could be the unique driving parameter for fatigue crack growth (FCG). Then, a unified FCG model is established based on the modified CTOD formula which considers the main physical mechanisms of small crack effect. Additionally, a theoretical equation of the transition crack length from PSC to LC is given. Finally, several datasets of different materials are used to validate the model.

Original language	English
Article number	108650
Journal	Engineering Fracture Mechanics
Volume	271
DOIs	https://doi.org/10.1016/j.engfracmech.2022.108650
Publication status	Published - Aug 2022

Keywords

Crack closure
Crack growth model
Crack tip opening displacement
Microstructural dissimilitude
Small crack

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10.1016/j.engfracmech.2022.108650

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title = "A unified prediction model for physically small crack and long crack growth based on modified CTOD",

abstract = "A unified model based on CTOD is proposed to calculate the growth rate of physically small crack (PSC) and long crack (LC). Firstly, an in-situ SEM testing under the single overload condition is performed to reveal that CTOD could be the unique driving parameter for fatigue crack growth (FCG). Then, a unified FCG model is established based on the modified CTOD formula which considers the main physical mechanisms of small crack effect. Additionally, a theoretical equation of the transition crack length from PSC to LC is given. Finally, several datasets of different materials are used to validate the model.",

keywords = "Crack closure, Crack growth model, Crack tip opening displacement, Microstructural dissimilitude, Small crack",

author = "Wei Zhang and Lindong Chai and Luping Ren and Liang Cai",

note = "Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

year = "2022",

month = aug,

doi = "10.1016/j.engfracmech.2022.108650",

language = "English",

volume = "271",

journal = "Engineering Fracture Mechanics",

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T1 - A unified prediction model for physically small crack and long crack growth based on modified CTOD

AU - Zhang, Wei

AU - Chai, Lindong

AU - Ren, Luping

AU - Cai, Liang

PY - 2022/8

Y1 - 2022/8

N2 - A unified model based on CTOD is proposed to calculate the growth rate of physically small crack (PSC) and long crack (LC). Firstly, an in-situ SEM testing under the single overload condition is performed to reveal that CTOD could be the unique driving parameter for fatigue crack growth (FCG). Then, a unified FCG model is established based on the modified CTOD formula which considers the main physical mechanisms of small crack effect. Additionally, a theoretical equation of the transition crack length from PSC to LC is given. Finally, several datasets of different materials are used to validate the model.

AB - A unified model based on CTOD is proposed to calculate the growth rate of physically small crack (PSC) and long crack (LC). Firstly, an in-situ SEM testing under the single overload condition is performed to reveal that CTOD could be the unique driving parameter for fatigue crack growth (FCG). Then, a unified FCG model is established based on the modified CTOD formula which considers the main physical mechanisms of small crack effect. Additionally, a theoretical equation of the transition crack length from PSC to LC is given. Finally, several datasets of different materials are used to validate the model.

KW - Crack closure

KW - Crack growth model

KW - Crack tip opening displacement

KW - Microstructural dissimilitude

KW - Small crack

UR - https://www.scopus.com/pages/publications/85134327439

U2 - 10.1016/j.engfracmech.2022.108650

DO - 10.1016/j.engfracmech.2022.108650

M3 - Article

AN - SCOPUS:85134327439

SN - 0013-7944

VL - 271

JO - Engineering Fracture Mechanics

JF - Engineering Fracture Mechanics

M1 - 108650

ER -

A unified prediction model for physically small crack and long crack growth based on modified CTOD

Abstract

Keywords

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