Quasicontinuum simulation of single crystal nano-plate with a mixed-mode crack

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:46

Article

Zhou, Tao¹  Yang, Xinhua¹  Chen, Chuanyao¹ 

[1] Huazhong Univ Sci & Technol, Dept Mech, Wuhan 430074, Hubei, Peoples R China

关键词: Mixed-mode crack;    Quasicontinuum method;    Atomic stress intensity factor;    Critical energy release rate;   

DOI  :  10.1016/j.ijsolstr.2009.01.010

来源: Elsevier

【 摘 要 】

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. (C) 2009 Elsevier Ltd. All rights reserved.

【 授权许可】

Free