Three-dimensional fracture via large-scale molecular dynamics

被引：43

作者：

Zhou, SJ

Lomdahl, PS

Voter, AF

Holian, BL

机构：

[1] Univ Calif Los Alamos Natl Lab, Appl Theoret & Computat Phys Div, Los Alamos, NM 87545 USA

[2] Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA

来源：

ENGINEERING FRACTURE MECHANICS | 1998年 / 61卷 / 01期

关键词：

atomistic simulation; three-dimensional crack; dislocation emission; ductility; embedded atom method;

D O I：

10.1016/S0013-7944(98)00053-8

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A series of massively parallel molecular dynamics simulations with up to 35 million atoms is performed to investigate dislocation emission from a three-dimensional crack. We observe dislocation loops emitted from the crack front, both in the bulk and near the free surfaces. The sequence of dislocation emission in the process of crack blunting strongly depends on the crystallographic orientation of the crack front and differs strikingly from anything previously conjectured. This finding is essential to establish a precise dislocation emission criterion (i.e: intrinsic ductility criterion). We also find that boundary conditions and interatomic force laws have a significant effect on jogging or blunting dislocation emission modes. (C) 1998 Elsevier Science Ltd. All rights reserved.

引用

页码：173 / 187

页数：15

共 38 条

[1] Brittle to ductile transition in cleavage fracture [J].