Effect of temperature and filler concentration on the strength of adhesively bonded single lap joint

Abstract

Adhesively bonded joints are mostly commonly used joints for structure components in past few decades. The most common joints are single lap joints and epoxy resin is one of the most frequently used structural adhesives because of its mechanical and chemical properties. Numerous factors influence the strength of adhesive joints, and various researchers have discovered numerous methods for increasing the single lap joints strength. The cork powder is an effecting way for refining the strength of single lap adhesive joints. The cork act like a crack stopper but at different concentrations, it behaves differently. The strength of single lap adhesively bonded joints with two dissimilar adherends (composite carbon fibre and aluminium coupons) is investigated in this study at a variety of temperatures and cork filler concentrations. The single lap joints are tested under tensile testing at universal testing machine. The temperature ranges from 25 degrees, 50 degrees, 75 degrees and 100 degrees and the cork powder concentration for each temperature are 0.25wt.%, 0.5wt.%, 0.75wt.% and 1wt.%. It is observed that for different temperature and for each concentration, the strength of single lap joints shows similar behavior trend. The highest strength is observed at room temperature and at 0.75wt.% cork powder concentration and minimum strength is observed at 100 degrees and at 1wt.% concentration. The type of failure is changes from mix mode failure to cohesive failure as temperature and cork powder changes from low to high.