Publication: Analysis of a cracked metallic panel repaired with bonded composite material
Date
2009-04-01
Authors
Tan, Chin Wei
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Abstract
The aim of reinforcement of the damaged or cracked part of a structure is to restore structural efficiency. A two-dimensional finite element analysis is presented to predict the efficiency and effectiveness of the repaired pre-cracked metallic panel with bonded composite patch. In this analysis, pre-cracked aluminum 2024-T3 panels (680 x 180 x 1.5mm) repaired with rectangular boron-epoxy composite patch with different overlap length were modeled and analysis using MSC Patran/Nastran. Several configuration of design of patch were investigated. Two-dimensional finite element analysis involving three layer technique is introduced to investigate the stress intensity factor, maximum 2D stress, load carrying capacity and crack propagation. 2D Mindlin plate elements which are with transverse shear deformation capability are applied in the analysis; cracked plate, adhesive and boron-epoxy composite patch. Maximum 2D stress and stress intensity factor at the crack tip of the repair panels are compared with the unpatch panel. It was found that there are significant reductions of maximum 2D stress and stress intensity factor at the crack tip after patching is done. In the analysis, the most effective design of patch will be determined.