Relationship between residual stress and strength of single lap joints made of Ti6Al4V alloy, adhesively bonded and treated using pneumatic ball peening

Abstract

The possibility of improving the strength of single lap joints (SLJs) made of Ti6Al4V alloys and adhesively bonded using Araldite 2014-1 with the help of pneumatic ball peening was investigated. The effects of pneumatic ball peening conditions on the joint strength and residual stress of the plates were determined using mathematical models, i.e. second-degree polynomials. A clear correlation was observed between the joint strength and the post-machining residual stress. Moreover, the stress values could be controlled. Pneumatic ball peening was found to be an easy and effective method for improving the joint strength (up to 57%) of SLJs.