Modeling of a cracked metallic structure with bonded composite patch using the three layer technique

Abstract

Due to the high computational cost of three-dimensional finite element analysis, the two-dimensional finite element analysis involving the three layer technique is introduced to investigate the repair of cracked metallic structures using an adhesively bonded composite patch. In the three layer technique, two-dimensional Mindlin plate elements with transverse shear deformation capability are used for all three layers; cracked plate, adhesive and composite patch. The accuracy of the three layer technique to compute the stress intensity factor for the metallic crack is demonstrated by a comparison with available two- and three-dimensional models. The strain energy release rates of the debond at the adhesive interfaces are also examined and compared with the previous studies. The three layer technique provides an efficient and accurate alternative model which is capable of investigating in depth the adhesive effects on the bonded patch repair of cracked metallic structures.