Abstract
This study aims to evaluate the effect of adding a pattern of conical holes on the substrate surface to improve mechanical interlocking of the bonded joint. The holes allowed the formation of micro pillars in the adhesive layer, promoting mechanical interlocking and considerably increasing the resistance of the joints. The single-lap shear tests were performed according to the ASTM D1002 standard. The results showed that the proposed solution presents a viable alternative to improve the resistance of bonded joints, promoting an increase of up to 99.84% in the final displacement and final resistance of the tested specimens. The finite element analysis also showed a reduction up to 18.11% in the stress peaks in the singularity point of the adhesive layer. Significant changes in the stress distribution around the micro pillars also was observed. Failures also have changed from an almost entirely adhesive condition to extremely fragmented cohesive failures.
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