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Lidon, Pierre
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document
Flexural fracturing of a cohesive granular layer
Abstract
We report on the fracturing of cohesive granular materials subjected to a flexural deformation. A thin layer of glass beads or of flour is deposited on an unstretchable membrane to which flexion is imposed. We observe the formation of a periodic fracturing-pattern whose characteristics are discussed in comparison with results previously obtained for an in-plane stretching [PRL 105, 208001 (2010)]. In particular, at a given relative humidity, the wavelength is observed to depend linearly on the layer thickness but to be independent of the grain size although the smallest grains are clearly more cohesive.