期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 46, 期 9, 页码 1975-1980出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2009.01.010
关键词
Mixed-mode crack; Quasicontinuum method; Atomic stress intensity factor; Critical energy release rate
类别
资金
- Programs for New Century Excellent Talents in University [NCET-06-064]
- Distinguished Young Scholars of Hubei Province [2007ABB010]
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.
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