Crack front propagation and fracture in a graphite sheet: A molecular-dynamics study on parallel computers

被引：126

作者：

Omeltchenko, A ^{[1
]}

Yu, J ^{[1
]}

Kalia, RK ^{[1
]}

Vashishta, P ^{[1
]}

机构：

[1] LOUISIANA STATE UNIV,DEPT COMP SCI,BATON ROUGE,LA 70803

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.78.2148

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Crack propagation in a graphite sheet is investigated with million atom molecular-dynamics simulations based on Brenner's reactive empirical bend-order potential. For certain crystalline orientations, multiple crack branches with nearly equal spacing sprout as the crack tip reaches a critical speed of 0.6V(R), where V-R is the Rayleigh wave speed. This results in a fracture surface with secondary branches and overhangs. Within the same branch the crack-front profile is characterized by a roughness exponent, alpha = 0.41 +/- 0.05. However, for interbranch fracture surface profiles the return probability yields alpha = 0.71 +/- 0.10. Fracture toughness is estimated from Griffith analysis and local-stress distributions.

引用

页码：2148 / 2151

页数：4

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