Observation and modeling of physically short fatigue crack closure in terms of in-situ SEM fatigue test

被引：26
|
作者：
Zhu, Ming-Liang [1 ]
Xuan, Fu-Zhen [1 ]
Tu, Shan-Tung [1 ]
机构：
[1] E China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 618卷
基金：
中国国家自然科学基金;
关键词：
Physically short crack; Crack closure; Fatigue crack growth; In-situ fatigue; MEASUREMENT LOCATION; ACOUSTIC-EMISSION; GROWTH-BEHAVIOR; NEAR-THRESHOLD; ALUMINUM-ALLOY; OPENING LOAD; LONG; PROPAGATION; DISPLACEMENT; MICROSTRUCTURE;
D O I：
10.1016/j.msea.2014.08.021
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Crack closure and opening behavior of physically short fatigue crack tip was investigated in microstructures with different grain sizes by using the in-situ SEM fatigue test. A gradually decreased crack closure zone near the crack tip was observed which depended on the microstructures, crack size and stress levels. A new parameter involving the load level, grain size, specimen dimensions and crack length was proposed to interpret the physically short crack closure development. The contribution of the gradient crack closure zone on the physically short fatigue crack growth behavior was evaluated by using the modified partial crack closure model. A generalized fatigue crack growth driving force was finally determined and correlated well with the physically short crack growth rate. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：86 / 95
页数：10
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