Numerical analysis of bonded composite patch efficiency in the case of lateral U and V-notched aluminium panels

Abstract

In this study, the finite element method is applied to investigate the mechanical behavior of aluminium notched structures reinforced by composite patch. In order to evaluate the efficiency of patches in the case of lateral U and V-notches repaired with a semi-circular patch shape, it is very important to analyze the stress distribution at the notch tip and to take in consideration the influence of the geometrical and mechanical properties of the patch and the adhesive. The effect of the patch size, thickness and type was highlighted. Furthermore, the effect of the adhesive thickness on the normal stress distribution was investigated. Simple and double patch were used as reinforcement techniques. Results showed that the increase of the contact area between the plate and the patch contributes to the normal stress reduction in the ligament of the plate. The adhesive thickness must be chosen carefully to keep the positive effects of the patch. The normal stress as well as the stress concentration factor are reduced at the notch tip by using a double patch reinforcement. This reduction becomes more noticeable when the patch thickness increases.

Keywords

• bonded composite patch
• adhesive
• stress concentration factor
• finite element method
• notch