Tensile performances of single-lap countersunk composite joints with metallic bushing

Abstract

Tensile tests were carried out on the single-lap countersunk composite joints with metallic bushing, and the load-displacement curves, strains and damage morphologies around the bolt hole were measured. A 3D progressive damage finite element model (FEM) was established in ABAQUS/Standard and verified by experimental results. Based on the validated model, tensile performances of the joints were investigated, including damage mechanism analysis of the laminate and the effect discussion of bushing thickness, tightening torque, interference fit size and etc. The results show that metallic bushing can improve ultimate bearing load of the joints. The stress distribution and initial damages caused by assembly around the laminate hole are little affected by bushing thickness. Appropriate tightening torque and interference fit size can improve tensile performances of the joint.