Influence of Roughness on the Mechanical Adhesion of Single Lap Joints

The single lap joints analysis has been developed from different perspectives, including overlap length, adhesive thickness, spew fillet formation, stress distribution, and manufacturing parameters. This paper describes recent results in the study of the roughness influence on the mechanical adhesion of single lap joints in composite test specimens made of glass fiber with a polymeric matrix. Analysis techniques were based on both finite element and experimental approaches. For the above-explained purpose, two cases were simulated: one with a surface roughness of the adherend in the joint overlap, and another one with a minimal roughness surface in the overlap zone. It was considered that the adhesive behaves like an isotropic material. As for the specimens used in the experimental tests, the surface roughness of the adherends was controlled by using an anti-adhering fabric, and the adherend specimen's surface without roughness was controlled using glass as a mould. The numerical results were validated ex...