Abstract
This paper reports an over-constraining effect on the near-tip stress field caused by the presence of a nearby coplanar crack, through detailed numerical investigations. The crack driving force, measured by the leading term in the near-tip stress solution, underestimates the stresses near the coplanar crack fronts. This study thus proposes a crack interaction factor based on the average Q-stress over a finite distance from the crack tip. The proposed interaction factor provides a close estimate of the near-tip stress for the coplanar cracks, and predicts successfully the interaction among coplanar elliptical crack-front locations, using an equivalent through-thickness coplanar crack model.
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