Análise da Adesão Fibra-Matriz de Compósitos Epóxi/Fibra de Carbono Por Meio do Comportamento Mecânico e Análise Fractográfica

Abstract

This work presents the possibility of indirect analysis of the quality of the Carbon Fiber Reinforced Composite (CFRC) interface that is produced with reinforcements that have been stored for a long period. Sometimes, due to geopolitical changes or even difficulties in the process of acquiring Carbon Fiber (CF) with specific standards, this item may be stored for a period of more than 5 years. And, for subsequent use, all the characteristics of this item must be proven in order to mitigate the possibility of catastrophic events due to an inefficient interface that was not playing the appropriate role of transferring load from the matrix to reinforcement. This work presents indirect tests, photographic patterns and specific wavenumbers, used for an indirect analysis of the interface. It was possible to observe through infrared spectroscopy that as the sizing curing process occurs, the amount of bonding of the Oxyrene group (C-O-C) decreases significantly and there is a significant increase in the Hydroxyl group (O-H), damaging the opening process of the filaments and consequently their wettability during the CRFC manufacturing process. However, the presence of reinforcement humans allows for good mechanical anchoring, which allows adequate adhesion, even with the absence of chemical anchoring. These facts were corroborated by the mechanical analysis carried out in this dissertation and highlighted the possibility of using this type of reinforcement in structures that do not require high performance.