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Fracture patterns in a thin layer of cohesive granular matter

Osvanny Ramos (ENS Lyon)

Understanding how materials deform beyond their linear “confines” and eventually break, presents a huge importance for science, technology, and everyday life. How cracks interact with each other developing different final patterns, and how the fracturing process depends on the dynamics and on the properties of the material, are not well understood issues. In order to address these questions we study the fracture of a cohesive layer of grains placed on top of an elastic membrane. By stretching and contracting the membrane in a very controlled manner, and by tuning the properties of the layer and the environment (grain size, thickness of the layer, humidity, etc) different patterns appear. We will discuss the different patterns and preliminary results in the explanation of them.