ATOMISTIC/CONTINUUM SIMULATION OF INTERFACIAL FRACTURE——PART Ⅰ: ATOMISTIC SIMULATION

被引：4

作者：

谭鸿来 ^{[1
]}

杨卫 ^{[1
]}

机构：

[1] Department of Engineering Mechanics, Tsinghua University, Beijing, China 100084

来源：

Acta Mechanica Sinica | 1994年 / 10卷 / 02期

基金：

中国国家自然科学基金;

关键词：

interfacial fracture; atomistic simulation; mode mixity; loading rate; zigzag interface;

D O I：

暂无

中图分类号：

O346.1 [断裂理论];

学科分类号：

080102 ;

摘要：

The phenomenon of interfacial fracture, as manifested by atom-istic cleavage, debonding and dislocation emission, provides a challenge for combinedatomistic-continuum analysis. As a precursor for fully coupled atomistic-continuumsimulation of interfacial fracture, we focus here on the atomistic behavior withina nanoscopic core surrounding the crack tip. The inter-atomic potential under Em-bedded Atom Method is recapitulated to form an essential framework of atomisticsimulation. The calculations are performed for a side-cracked disc configuration un-der a remote K field loading. It is revealed that a critical loading rate defines thebrittle-to-ductile transition of homogeneous materials. We further observe that thenear tip mode mixity dictates the nanoscopic profile near an interfacial crack tip. Azigzag interface structure is simulated which plays a significant role in the dislocationemission from an interfacial crack tip, as will be explored in the second part of thisinvestigation.

引用

页码：150 / 161

页数：12