Effect of the interference fit on the stress distribution and failure mode of a flat-head riveted GLARE joint

摘要

Glass laminate aluminium reinforced epoxy (GLARE) is an ideal material for fuselage skin, and a rivet joint is the most reliable way to connect fuselage skin. Due to the complex deformation of the joints and the effects of the riveted residual stress, the tensile failure modes are complex and difficult to predict during the service stage. A 3D constitutive model was employed to analyse the mechanical and failure behaviours of the flat-head rivet joints of GLARE during the entire process from riveting to stretching. Under different fibre orientations of GLARE, the effects of the riveting interference on the stress distribution during riveting, the residual stress and the failure mode were investigated. The compressive stress and bending stress when the fibres were in the 0 degrees direction are the main load modes during riveting, but only the bending stress in the 0 degrees direction becomes residual stress. If the bending stress is more highly concentrated in a fibre layer, there is greater damage accumulation in the layer. Since a high interference fit may also cause the shear fracture of the rivet and serious interface delamination, the riveting interference should be under strict control against the different fibre orientations of GLARE.