Abstract
In order to investigate dynamic crack propagation processes in thermally tempered glass, observation of shadow spots and evalution of the dynamic stress intensity factor K1D have been attempted using the method of caustics. Changes of the shadow spot diameter were studied at crack bifurcation in glass plates of 10mm thickness as a function of propagation distance before and after bifurcation, and also of the angle of bifurcation. It has been shown that values of K1D could be reduced to one half at the bifurcation.
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