Abstract:

Dimple rivet joint and bolt joint are the typical fastening styles used in aerocraft. In a 3D finite element analysis (FEA) model, the dimple and straight hole structures with or without fanlike cracks around their holes are simulated. First, critical sits are obtained by the FEA of dimple hole structure without fanlike cracks around its hole. Second, the stress intensity factors (SIF) of the fanlike cracks around the dimple and straight hole are computed. Based on these SIF, some factors that will affect SIF generally, such as the crack length, hole radius and structure thickness, are discussed. The accuracy of the results and reliability of the numerical method and FEA model used in the paper have been demonstrated by comparisons between SIF about the straight hole obtained here and those in literature. Therefore, the numerical results and some conclusions given in this paper can be used as a basis for the damage tolerance design of dimple joints.

Key words: dimple hole, finite element analysis (FEA), stress intensity factors (SIF), fanlike crack