Mixed-mode fracture analyses of plastically-deforming adhesive joints

A mode-dependent embedded-process-zone (EPZ) model has been developed and u sed to simulate the mixed-mode fracture of plastically deforming adhesive j oints. Mode-I and mode-II fracture parameters obtained from previous work h ave been combined with a mixed-mode failure criterion to provide quantitati ve predictions of the deformation and fracture of mixed-mode geometries. Th ese numerical calculations have been shown to provide excellent quantitativ e predictions for two geometries that undergo large-scale plastic deformati on: asymmetric T-peel specimens and single lap-shear joints. Details of the deformed shapes, loads, displacements and crack propagation have all been captured reasonably well by the calculations.