Abstract
Prediction of crack growth involves two aspects, that is, when would the crack start to grow, and in what direction. Under Mode I conditions, the crack grows in its original direction. The fracture criterion thus can be established using either KI in Irwin's stress intensity factor theory, or GI in the energy release theory including the Griffith theory. Under general mixed mode conditions, experimental observations indicate that the crack will no longer grow in its original direction and KII also plays a role in crack growth. Hence, an appropriate fracture criterion is required to establish, to predict mixed mode crack extension. As in the Mode I fracture, both energy and near-tip stress field approaches are used in mixed mode fracture studies. In the energy balance approach, a small kink from the main crack tip is analyzed to determine the energy release rate along the direction of the kink.
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