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We study the interaction between two cracks propagating quasistaticallyduring the tearing of a thin brittle sheet. We show that the cracks attracteach other following a path described by a power law resulting from thecompetition between elastic and fracture energies. The power law exponent(8/11) is in close agreement with experiments. We also show that a second(asymptotic) regime, with an exponent of 9/8, emerges for small distancesbetween the two crack tips due to the finite transverse curvature of theelastic ridge joining them.

Tearing of thin sheets: Cracks interacting through an elastic ridge