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Instabilities in Elastic Layers

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If you have a question about this talk, please contact Dr G Moller.

I will introduce two instabilities that occur in highly elastic layers. In the first the layer is confined between and bonded to two rigid bodies which are then separated. At a critical separation fingers of air protrude into the elastic layer from its boundary in a way reminiscent of Saffman-Taylor fingering in confined viscous fluids. In the second the elastic layer is bonded to a rigid substrate and then caused to grow (or swell). The growth leads to substantial compression on the free surface and, at a critical degree of compression, the surface develops sulci. I will explore the patterns formed by these sulci and explain why the transition to the sulcal state has so far eluded theoretical explanation.

This talk is part of the TCM Informal Seminar Series series.

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