Abstract
Abstract— The relation is examined between the strain sensitivity and the grain size of a grown copper foil gauge which has a preferred orientation to slip. We adopted this gauge to evaluate the mode II stress intensity factor KII of a through‐thickness crack in a plate subjected to cyclic torsion. The KII values obtained are lower than the calculated values because of the frictional force on the crack surfaces. By using the experimentally determined KII value for torsion and the calculated KI values for plane bending, the threshold condition for crack propagation under the combination of bending and torsion is predicted on the basis of the strain energy density criterion.
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