Desiccation and Relaxation Regimes in Fracture of Drying Clay Films

Physics – Condensed Matter – Soft Condensed Matter

Scientific paper

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8 pages, 7 figures

Scientific paper

A study of crack patterns in laponite films of different thickness is presented. Two cracking regimes are observed. The earlier with a higher rate of desiccation and shrinking has predominantly four-fold vertices in the crack network, while the later regime has less volume shrinking and forms mainly three-fold vertices. The pattern shows a self-similarity under coarse-graining. The graph of area covered by the cracks versus minimum crack-width resolved, scales with the film thickness. Curves representing crack area for different thickness can thus be made to collapse onto a single curve.

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