Allowable Load Assessment in Metal-Composite Double-Lap Joint

Resumo

This work consists of evaluating the tensile and compression static allowable stress of a hybrid (metal
-composite) riveted joint. The analyzed joint is composed by two sheets of 2014 – T6 aluminium alloy and a
T300/5208 Graphite/Epoxy quasi-isotropic laminate, which were joined by twelve Lockbolt Swaged Collar rivets
titanium alloy Ti–6Al–4V annealed. The joint was analyzed through a computational model developed using the
Finite Element Method (FEM), with the fasteners modelled through the Multi - Springs technique. This method
was widely used to simulate the mechanical behaviour metal-metal and composite-composite parts of the joint.
It is validated comparing its results with analytical results of metallic joints available in the literature. Through
this model, both the allowable load and its distribution in the fasteners of the joint were determined. Since the
evaluated joint is subjected to double shear and, therefore, has no eccentricities, the presence of secondary bending
was not observed, the bearing and bypass loads were the most relevant in evaluating the allowable loads of the
joint. The load distribution in the joint and its components’ safety margin was determined, with the laminate being
the limiting component of the allowable load.