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.

在拉伸剪切试验条件下，有或没有填料的搭接接头的失效模式可能包括界面剪切断裂，板材中接近正常的断裂以及各个位置的颈缩。无论是材料强度理论还是断裂力学，通常采用的分析都是有问题的，因为剪切力或法向断裂力与颈缩力相距不远，因此应明确计算整个损伤演化。这里采用经典的Gurson–Tvergaard–Needleman模型和剪切扩展的Gurson模型来计算由孔隙增长控制的延性破坏过程，这有助于构造关于几何和材料参数的破坏模式图。