Failure mode maps of lap joints under the tensile shear testing condition

Failure modes in lap joints with or without the filler material under the tensile shear testing condition may include the interfacial shear fracture, the nearly normal fracture in the plate materials, and necking in various locations. The commonly adopted analyses by either material strength theory or fracture mechanics are problematic, since the shear or normal fracture forces are not far from that for necking and thus the entire damage evolution should be explicitly calculated. The classic Gurson–Tvergaard–Needleman model and a shear-extended Gurson model are employed here to calculate the void-growth-controlled ductile failure process, which facilitate the construction of failure mode maps with respect to geometric and material parameters.