Oscillations in Rapid Fracture

Abstract

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

4 pages, 5 figures

References in corpus (3)

• Dynamic instabilities of fracture under biaxial strain using a phase field model
• Solvent control of crack dynamics in a reversible hydrogel
• Oscillatory Instability in Two-Dimensional Dynamic Fracture

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