Abstract
Abstract: The method of crack opening displacement (COD) has been used to obtain the energy release rate of fast propagating cracks just before and just after crack bifurcation. In this method, COD is measured on the microscopic photographs of the cracks. But, in the case of cracks in Araldite B, the corner made of a crack surface and a specimen surface is chipped out of the specimen; then, it is often difficult to measure CODs from the photographs of the cracks. The present study proposes a method to approximately measure the COD in the region where COD is difficult to be measured directly on the photograph. The accuracy of the approximate method is good enough that the measured CODs can give the energy release rate of the crack at bifurcation with the accuracy of about 7%.
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