Understanding thermal-mechanical fatigue crack growth: A microscopic mechanical model

被引：7
|
作者：
Zhang, R [1 ]
Sun, Y [1 ]
Ma, J [1 ]
机构：
[1] Harbin Inst Technol, Dept Astronaut & Mech, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2005年 / 398卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
thermal-mechanical fatigue; crack growth; microscopic mechanical model;
D O I：
10.1016/j.msea.2005.03.013
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the present paper, an original fatigue crack growth model is employed and further developed. Based on it, a new microscopic mechanical model of thermal-mechanical fatigue crack growth is proposed. The model is based on the dislocation-free zone (DFZ) theory and cohesive zone model. The process of thermal-mechanical fatigue crack growth is viewed as the intermittent quasi-cleavage fracture of the DFZ. A simple relation is employed to evaluate the thermal-mechanical fatigue crack growth rate. The calculated crack growth rate curve (dc/dN curve) exhibits different regimes after initiations of the crack (Delta k > Delta k(th)), which is in agreement with the propagation pattern of creep-fatigue crack. The model gives a reasonable explanation for thermal-mechanical fatigue crack growth. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：142 / 145
页数：4
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