Abstract
The evolution of the crack growth speed in a buckled one-dimensional delamination model is studied and two approximate solutions are presented. In the quasi-dynamic analysis one assumes that the time-dependent deflection of the delaminated layer may be approximated by the static postbuckling solution for the current delamination length. In a refined analysis one introduces an indeterminate amplitude function. The local growth condition at the crack tip is not enforced but a global energy-balance condition is used. The crack growth speeds are found to be comparable to the speeds of flexural waves. For slow and moderate rates of crack growth, the present results are in close agreement with the finite-difference solutions of the dynamic problem.
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