A Comparison Between Measurements and Finite Element Predictions of Crack Opening Displacements Near the Front of an Interface Crack

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Abstract
Crack opening displacements close to the front of an interface crack between glass and epoxy determined from measurements and finite-element solutions are compared. The measurements were made using optical interferometry, and the finite-element solutions were based on a linear material response and the displacements that were applied during crack initiation experiments using a blister test configuration. Various load levels, up to initiation, are considered, and the effect of fracture mode-mix examined by considering different initial crack diameters. The comparisons indicate that a relative increase in the mode II component gave rise to a significant increase in inelastic behavior near the crack front.