Abstract
In order to understand the influence of friction on crack extension in brittle materials, we studied a set of wing cracks in PMMA (polymethylmethacrylate) plates, formed under constant uniaxial loading at the tip of preexisting oblique closed slots of various angles. It was found that: 1.- as for an open slot (no friction), the wing cracks were initiated at a certain distance from the initial crack tip; 2.- for a given friction coefficient, this distance and the branching crack angle (which is less than 90°) increased with the slot-loading axis angle.
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