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Adding perforations to a continuum sheet allows new modes of deformation, andthus modifies its elastic behavior. The failure behavior of such a perforatedsheet is explored, using a model experimental system: a material containing aone-dimensional array of rectangular holes. In this model system, a transitionin failure mode occurs as the spacing and aspect ratio of the holes are varied:rapid failure via a running crack is completely replaced by quasi-staticfailure which proceeds via the breaking of struts at random positions in thearray of holes. I demonstrate that this transition can be connected to the lossof stress enhancement which occurs as the material geometry is modified.

Geometric control of failure behavior in perforated sheets