An Einstein model of brittle crack propagation

被引：26

作者：

Holian, BL

Blumenfeld, R

Gumbsch, P

机构：

[1] CAMBRIDGE HYDRODYNAM,PRINCETON,NJ 08542

[2] MAX PLANCK INST MET RES,D-70174 STUTTGART,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 01期

关键词：

D O I：

10.1103/PhysRevLett.78.78

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We propose a minimal nonlinear model of brittle crack propagation by considering only the motion of the crack-tip atom. The model captures many essential features of steady-state crack velocity and is in excellent quantitative agreement with many-body dynamical simulations. The model exhibits lattice trapping. For loads just above this, the crack velocity rises sharply, reaching a limiting value well below that predicted by elastic continuum theory. We trace the origin of the low limiting velocity to the anharmonicity of the potential well experienced by the crack-tip atom.

引用

页码：78 / 81

页数：4

共 17 条

[1] MICROSCOPIC FRACTURE STUDIES IN 2-DIMENSIONAL TRIANGULAR LATTICE [J].

ASHURST, WT ;

HOOVER, WG .

PHYSICAL REVIEW B, 1976, 14 (04) :1465-1473

[2] Nonequilibrium brittle fracture propagation: Steady state, oscillations, and intermittency [J].

Blumenfeld, R .

PHYSICAL REVIEW LETTERS, 1996, 76 (20) :3703-3706

[3] Dynamic instabilities in fracture [J].

Ching, ESC ;

Langer, JS ;

Nakanishi, H .

PHYSICAL REVIEW LETTERS, 1996, 76 (07) :1087-1090

[4] INSTABILITY IN DYNAMIC FRACTURE [J].

FINEBERG, J ;

GROSS, SP ;

MARDER, M ;

SWINNEY, HL .

PHYSICAL REVIEW LETTERS, 1991, 67 (04) :457-460

[5]

Gumbsch P, 1996, MATER RES SOC SYMP P, V409, P297

[6]

Gumbsch P, 1996, COMPUTER SIMULATION, P227

[7]

GUMBSCH P, IN PRESS PHYS REV B

[8] FRACTURE SIMULATIONS USING LARGE-SCALE MOLECULAR-DYNAMICS [J].

HOLIAN, BL ;

RAVELO, R .

PHYSICAL REVIEW B, 1995, 51 (17) :11275-11288

[9] SOME BASIC PROBLEMS IN STRESS WAVE DOMINATED FRACTURE [J].

KNAUSS, WG ;

RAVICHANDAR, K .

INTERNATIONAL JOURNAL OF FRACTURE, 1985, 27 (3-4) :127-143

[10]

LUND F, 1996, PHYS REV LETT, V76, P2724

← 1 2 →