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Softening Induced Instability of a Stretched Cohesive Granular Layer

Abstract : We report on a cellular pattern which spontaneously forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching. We present a simple model in which the mechanism responsible of the instability is the ''strain softening'' exhibited by humid granular materials above a typical strain. Our analysis indicates that such a type of instability should be observed in any system presenting a negative stress sensitivity to strain perturbations.
Keywords : 8975Kd
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Hector Alarcon, Osvanny Ramos, Loïc Vanel, Franck Vittoz, Francisco Melo, et al.. Softening Induced Instability of a Stretched Cohesive Granular Layer. Physical Review Letters, American Physical Society, 2010, 105 (20), ⟨10.1103/PhysRevLett.105.208001⟩. ⟨hal-01727369v2⟩

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