Biomimética aplicada ao projeto e à análise de juntas coladas nanomodificadas por nanotubo de carbono

Abstract

This work aims to propose a new design of single-lap bonded joint. Bioinspired on feet morphology of some reptiles (gekkonidae) that have extremely effective micropillaries in promoting adhesion in different surfaces, this project introduced millimetric holes in the overlapping surfaces of the adherents. These holes allowed the creation of pillars in the adhesive layer, promoting mechanical interlocking and considerably increasing the resistance of joints. The tests were performed in adhesives with different mechanical behaviors. The results showed that proposed solution proves to be a viable alternative to improve the mechanical resistance of the bonded joints, it promoting increases up to 93% in the displacement and final resistance of the tested bodies. During the process, the mechanical characteristics of the adhesives were evaluated. The adhesives were nanomodified by the addition of carbon nanotubes and its properties were analyzed both at the macroscopic and microscopic level via atomic force microscopy. Nanocomposites showed improvements up to 98% in stiffnes if compared to the pure adhesive. The homogeneity of the material was avaluated quantitatively using the global and local Moran indexes. The results corroborating with the improvements observed in mechanical properties of adhesives.