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Crack formation patterns in laponite gel are known to be strongly affected byDC electric fields. We show that AC fields produce equally remarkable patternsin a radially symmetric set-up. The character of the pattern depends cruciallyon the field strength. A significant feature observed is the bending of radialcracks, with the curvature increasing as field strength is increased. Fields of20 to 70 V have been applied and several features of the resulting patternsquantified. Striations on the fracture surfaces and crack speeds are alsostudied.

Crack Formation in Laponite Gel under AC Fields