Abstract
This study investigates the problem of applying fracture mechanics to the evaluation of strength of adhesive joints. Double-cantilever beam (DCB) and single-lap joint (SLJ) specimens with a crack in their adhesive layers are employed for this study. The adherends are acryl and epoxy plates and the adhesive is cemedine 1500. The energy release rate G for a crack in an adhesive layer is analyzed by a finite element method and also by a compliance method. It is necessary to evaluate the mode I and II energy release rates separately. For this purpose, a virtual crack extension method (VCM) is successfully applied to FEM analyses for a mixed mode crack in the adhesive joint. The results obtained by FEM combined with VCM coincide with those obtained experimentally by a compliance method. The fracture toughness of DCB and SLJ adhesive specimens is well characterized by the energy release rate. It is found that the mode I energy release rates GIC for both the DCB and SLJ specimens agree with each other and it seems that the mode II energy release rate GII has a very small effect on fracture toughness.
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