Effect of cohesion and shear modulus on the stability of a stretched granular layer

The main mechanism of the cellular pattern which forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching has been identified as the "strain softening" arising from the features of grain-grain interactions. We perform measurements of the strain...

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Bibliographic Details
Published in:Physical review. E, Statistical, nonlinear, and soft matter physics Statistical, nonlinear, and soft matter physics, 2012-12, Vol.86 (6 Pt 1), p.061303-061303, Article 061303
Main Authors: Alarcón, Hector, Géminard, Jean-Christophe, Melo, Francisco
Format: Article
Language:English
Subjects:
Engineering Sciences
Mechanics
Mechanics of materials
Physics
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Summary:The main mechanism of the cellular pattern which forms at the surface of a thin layer of a cohesive granular material submitted to in-plane stretching has been identified as the "strain softening" arising from the features of grain-grain interactions. We perform measurements of the strain field associated with such structures by using a correlation image technique and additionally characterize the cohesion and shear modulus of the samples. We show that for high cohesion, the layer is fragile and the surface deformation is highly nonlinear, whereas at low cohesion, a smooth and linearly growing structure is observed as a function of external stretching. Analysis of the wavelength as a function of cohesion along with independent measurement of the shear modulus indicate that a simple model of strain softening is acceptable if a mechanism of cluster formation due to cohesion is taking place.
ISSN:1539-3755
1550-2376
DOI:10.1103/PhysRevE.86.061303