Abstract
A novel method which uses an electro-optical arrangement to measure crack velocities in transparent materials is described. It is applied to fast cracks in polymethylmethacrylate of different molecular weights; in polymethylmethacrylate of weight average molecular weightMw=163 000 there is a transition in the appearance of the fracture surface, which changes from smooth to coarse-structured rib-like roughness, associated with a transition in the measured crack velocity. This effect and possible causes are discussed.
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