Theoretical Research on The Dynamic Crack Propagation Velocity Based on Nonlocal Field Theories

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外文摘要：The purpose of this paper is to discuss the nonlocal effect on dynamic crack propagation velocity. Some experimental phenomena in dynamic fracture and simulative results using molecular & atom dynamics were analyzed and discussed in this paper. The authors found that there were still some disagreements on the dynamic crack propagation velocity. Based on these researches, we introduced nonlocal field theories into the estimation of dynamic crack propagation velocity. The dynamic crack propagation velocity is affected not only by the crack instability, but by characteristic length of material. A nonlocal characteristic length parameter M is defined through a double pile-up dislocation model. According to the Mott's research method for crack velocity in dynamic fracture and the nonlocal field theories, an approximate theoretical dynamic propagation velocity is obtained. And we conclude that the velocity is related to the combined activity of the nonlocal characteristic length parameter M, the velocity of longitudinal wave, constant k, crack length and Poisson's ratio.

外文关键词：

nonlocal field theoriesdynamic fracturecrack propagation velocity

作者：

Liu Cai-ping、DUAN Qing-quan、Zuo Jian-ping

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作者单位：

School of Civil and Environment Engineering, University of Science and Technology Beijing, China

School of Mechanical and Electronic Engineering, China University of Petroleum(Beijing),Beijing, China

School of Mechanics & Civil Engineering, China University of Mining and Technology Beijing, China

出版年：

2010

Key engineering materials

ISSN：1013-9826

年,卷(期)：2010.417/418