A microscopic mechanism model and quantitive description of fatigue crack growth

被引：7
|
作者：
Jun, M [1 ]
Yi, S [1 ]
机构：
[1] Harbin Inst Technol, Dept Astronaut Engn & Mech, Harbin 150001, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2003年 / 355卷 / 1-2期
关键词：
fatigue crack growth; dislocation-free zone; cohesive zone; cleavage fracture;
D O I：
10.1016/S0921-5093(03)00050-9
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In the present paper, a new microscopic mechanism model of fatigue crack growth is presented based on the dislocation-free zone (DFZ) theory. A cohesive zone model is developed to determine the stress field of the DFZ under cyclic loading. The process of fatigue crack growth is viewed as the intermittent quasi-cleavage fracture of the DFZ. A simple relation is derived to evaluate the fatigue crack growth rate. The calculated dc/dN curves exhibit three different regimes of fatigue crack growth, which is in agreement with the general propagation pattern of fatigue crack. The model gives a reasonable explanation for both the crack growth and striation formation. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：14 / 17
页数：4
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