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Path of Crack Growth under Pure Shear

The extent of economic damage due to brittle fracture may depend significantly on the path of crack growth. Therefore, it is important to develop appropriate techniques for predicting the path of crack growth in cracked components and structures. Although several methods are available for this purpose, the applications of these methods have been studied mainly for mode I cracks. The aim in this paper is to evaluate two available methods for predicting the path of brittle fracture for a given specimen subjected to pure mode II: "the method of incremental crack growth" and "the method of onset of fracture". The experimental path of fracture, already known from an earlier study, is used to investigate the accuracy of results obtained from the present methods. The maximum tangential stress criterion is employed to determine the fracture path in any of the above mentioned methods. The effect of a higher order term of stress on the path of crack growth is also studied. The computational results show that any of these two methods can provide an acceptable prediction for path of crack growth in the given specimen.