Tensile Stress Concentration Due to Counter Sunk Holes in Adhesively Bonded Layered Aluminum.

Abstract

The adhesively bonded layered aluminum is used in aircraft structures to avoid knife edge situations when flush head fasteners are used with minimum gage skins. A 3-D finite element model was used to estimate the location and magnitude of stress concentration under remote tension for aforementioned. The influence of the countersunk depth and adhesive properties on the stress concentration was investigated for a counter sunk angle of 100 º. The stress concentration was found to be maximum at the countersink edge for Eadh/Eal > 0.1 whereas it is slightly below the countersink edge in straight shank portion for Eadh/Eal < 0.1. Stress concentration was found to be minimum when the adhesive is positioned in the countersunk section.