Softening induced instability of a stretched cohesive granular layer

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 m...

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Bibliographic Details
Published in:Physical review letters 2010-11, Vol.105 (20), p.208001, Article 208001
Main Authors: Alarcón, Hector, Ramos, Osvanny, Vanel, Loïc, Vittoz, Franck, Melo, Francisco, Géminard, Jean-Christophe
Format: Article
Language:English
Subjects:
Condensed Matter
Materials Science
Physics
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.105.208001