Estudo de adesivo epóxi reforçado com nanotubo de carbono e comparação para juntas coladas, rebitadas e híbridas

Abstract

Structural joints have a wide variety of configurations in terms of geometry or the joining method involved within the adherents. Therefore, it is very important to understand their applications in order to combine them and compare between each other. This work includes the study of structural joints in different configurations in terms of the method of attachment. Mechanical properties are examined for adhesive joints, mechanical fastened (riveting) joints and even a combination of both:the hybrid joint (e.g. adhesively bonded and riveted). For the adhesively bonded and hybrid joints, it was applied an epoxy system with AR300 resin and AH-30/150 hardener, structural adhesive was applied in different configurations: blank and nanomodified by the dispersion of carbon nanotube, with the purpose of investigating the effect of dispersing those nanostructures within the joining area. The type of joint applied for the experiments was the single lap joint. Nanostructures weredispersed in different concentrations in epoxy adhesive and the modified adhesive was tested for both hybrid and bonded joints. Carbon nanotube (CNT) is used as grown and its concentrations are varied in order to allow the understanding of its implications in the joining method. The final results revealed improvements of up to 189% in apparent shear strength for the single lap joints with. This result is a combination of two factors: the CNT addition and tapering.