Abstract
Stress wave propagation, crack initiation, crack motion, crack arrest and the interaction of stress waves and cracks were examined in an experimental study. Dynamic photoelasticity used in conjunction with ultra-high speed photography provided full-field visualization of the several phases in the dynamic fracture process. Two fundamental problems were examined—the full-plane and the half-plane with a tensile type center of dilatation. The fracture process was characterized for both of these problems for the case where the pressure pulse at the dilatational source was of extremely short duration. The importance of the reflected stress waves in extending the fracture zone is clearly established.
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