Abstract
Dynamic crack propagation has been studied in detail for a series of transparent rubber-toughened samples of poly(methyl methacrylate) using a combination of high-speed photography and the optical method of transmitted caustics. The dynamic stress intensity factor has been measured as a function of rubber content, crack length and loading rate. The dynamic stress intensity factor is found to increase significantly as the rubber content increases, which is consistent with the improvement in impact behaviour found on the addition of rubber particles. It is proposed that the toughening takes place through crack tip blunting caused by localized shear yielding induced by the presence of the rubber particles.
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