Quasicontinuum simulation of single crystal nano-plate with a mixed-mode crack
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- 作者：Tao Zhou ; Xinhua Yang ; Chuanyao Chen
- 关键词：Mixed-mode crack ; Quasicontinuum method ; Atomic stress intensity factor ; Critical energy release rate
- 刊名：International Journal of Solids and Structures
- 出版年：2009
- 出版时间：1 May 2009
- 年：2009
- 卷：46
- 期：9
- 页码：1975-1980
- 全文大小：1134 K
文摘
The quasicontinuum (QC) method is employed to simulate a nickel single crystal nano-plate with a mixed-mode crack. Atomic stresses near the crack tip are fitted according to the elastoplastic fracture mechanics equations. It is found that the atomic stress fields neighboring the crack tip are also singular and controlled by the atomic stress intensity factors. And then the critical energy release rates for brittle and ductile fracture are computed and compared in order to predict crack propagation or dislocation emission. Four possible slip directions at the crack tip are pointed out. Finally, the slip direction around the crack tip is determined by the shear stress and it is well consistent with the atomic pictures from the QC simulation.