The interaction of crack and dislocations in cyclic loading in the body-centered cubic (BCC) crystal

被引：3
|
作者：
Sheng, Yue [1 ]
Yang, Hongda [1 ]
Zhang, Jiding [1 ]
Jiang, Xiaoyu [1 ]
机构：
[1] Southwest Jiaotong Univ, Sch Mech & Engn, Chengdu, Peoples R China
来源：
ENGINEERING FRACTURE MECHANICS | 2023年 / 292卷
基金：
中国国家自然科学基金;
关键词：
Cyclic loading; Crack propagation; Dislocations; Grain boundary; Shielding effect; TRANSMISSION ELECTRON-MICROSCOPY; GRAIN-BOUNDARY; FATIGUE; GROWTH; MICROSTRUCTURES; PROPAGATION; TIPS;
D O I：
10.1016/j.engfracmech.2023.109558
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
In engineering, the mode of fatigue crack propagation in crystals is very important for studying the first stage of fatigue crack propagation. In this paper, a model of fatigue crack propagation in crystals is established by using the discrete dislocation method. The propagation rate of fatigue cracks in different crystals and the dislocation movement and distribution on the slip plans (SP) in front of cracks during loading and unloading are obtained by calculation the model. The effects of different dislocation motion behaviors on fatigue crack growth rate during loading and unloading are analyzed, including dislocation emission, rebound and annihilation. Compared with the case without considering dislocation shielding effect, the influence of dislocation shielding effect on fatigue crack propagation is given. At the same time, the effects of different grain sizes and different grain boundary (GB) angles on fatigue crack propagation are studied.
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页数：10
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