Near-tip strain evolution and crack closure of growing fatigue crack under a single tensile overload

被引：35

作者：

Chen, Rong ^{[1
]}

Zhu, Ming-Liang ^{[1
]}

Xuan, Fu-Zhen ^{[1
]}

Wu, Sheng-Chuan ^{[2
]}

Fu, Ya-Nan ^{[3
]}

机构：

[1] East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

[2] Southwest Jiaotong Univ, State Key Lab Tract Power, Chengdu 610031, Peoples R China

[3] Chinese Acad Sci, SSRF, Shanghai Adv Res Inst, Shanghai, Peoples R China

来源：

INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 134卷

基金：

中国国家自然科学基金;

关键词：

In-situ SEM; 3D synchrotron; Overload effect; Residual stress; Crack closure; RESIDUAL-STRESS; GROWTH; RETARDATION; PROPAGATION; BEHAVIOR; STEEL; PREDICTION; THRESHOLD; CYCLES; ALLOY;

D O I：

10.1016/j.ijfatigue.2020.105478

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

Fatigue crack growth retardation of AZ31 alloy under a single tensile overload was investigated by 3D synchrotron radiation, 2D in-situ SEM and digital image correlation techniques. Results showed a consistent evolution of crack closure level by both 3D and 2D methodologies. The straining and plastic zone ahead of crack-tip, and crack opening displacement behind, which were quantitative indicators of crack-tip shielding, residual stress formation and relaxation, were correlated well with the retardation behavior. Mechanistically, compressive residual stress played a dominant but time-limited role while crack closure was secondary, based on an intrinsic load transfer concept during crack growth.

引用

页数：11

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