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

被引：14

作者：

Zhang, Wei ^{[1
]}

Chai, Lindong ^{[1
]}

Ren, Luping ^{[2
]}

Cai, Liang ^{[3
]}

机构：

[1] Beihang Univ, Sch Reliabil & Syst Engn, Beijing 100191, Peoples R China

[2] Shanghai Marine Diesel Engine Res Inst, Shanghai 200090, Peoples R China

[3] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China

来源：

ENGINEERING FRACTURE MECHANICS | 2022年 / 271卷

基金：

中国国家自然科学基金;

关键词：

Small crack; Crack tip opening displacement; Crack closure; Microstructural dissimilitude; Crack growth model; FATIGUE-CRACK; STRESS RATIO; BEHAVIOR; PROPAGATION; THRESHOLD; CLOSURE; EQUATION;

D O I：

10.1016/j.engfracmech.2022.108650

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

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 ma-terials are used to validate the model.

引用

页数：17

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