Oscillations in rapid fracture

被引：75

作者：

Livne, Ariel ^{[1
]}

Ben-David, Oded ^{[1
]}

Fineberg, Jay ^{[1
]}

机构：

[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

来源：

PHYSICAL REVIEW LETTERS | 2007年 / 98卷 / 12期

关键词：

D O I：

10.1103/PhysRevLett.98.124301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experiments of pure tensile fracture in thin brittle gels reveal a new dynamic oscillatory instability whose onset occurs at a critical velocity, V-C=0.87C(S), where C-S is the shear wave speed. Until V-C, crack dynamics are well described by linear elastic fracture mechanics (LEFM). These extreme speeds are obtained by suppression of the microbranching instability, which occurs when sample thicknesses are made comparable to the minimum microbranch width. The wavelength of these sinusoidal oscillations is independent of the sample dimensions, thereby suggesting that these macroscopic effects are due to an intrinsic microscopic scale that is unrelated to LEFM.

引用

页数：4

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