Softening induced instability of a stretched cohesive granular layer |
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Authors: | Alarcón Hector Ramos Osvanny Vanel Lo?c Vittoz Franck Melo Francisco Géminard Jean-Christophe |
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Institution: | Departamento de Física, Universidad de Santiago de Chile, Avenida Ecuador 3493, Casilla 307, Correo 2, Santiago, Chile. |
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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. |
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