Abstract
Dynamic extension of Sih's fracture criterion based on strain energy density factor, r c ( dW/ dV) , is used to analyze dynamic crack propagation and branching. Influence of the nonsingular components, which are known as the higher order terms (HOT) in the crack tip stress field, on the strain energy density distribution at a critical distance surrounding the crack tip moving at constant crack velocity is examined. This r c ( dW/ dV) fracture criterion is then used to analyze available dynamic photoelastic results of crack branching and of engineering materials.
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