Finite element parametric study of a composite-to-steel-joint

The use of metal-to-composite joints has recently extended into the marine field as a novel method of incorporating lightweight GRP structural parts (i.e. superstructures) to steel hulls. In this work, an adhesively bonded butt-joint, comprised of a double lap steel-GFRP joint and a GFRP sandwich composite part has been studied. In order to simulate the mechanical behavior of the joint subjected to tensile and bending loading, a two-dimensional finite element model was developed. The numerical modelling encompassed cohesive elements so as to simulate the adhesive failure procedure. Various design parameters were examined in order to evaluate their effects on the joint load bearing capacity and stiffness. The analysis of the results showed that specific design parameters could fairly improve the joint's strength and stiffness. Finally a specific joint design which met the desired characteristics is proposed.