Análise Mecânica e Dinâmica Tridimensional de um Compósito Cilíndrico de Fibra de Carbono/Epóxi em Função do Padrão de Bobinamento

Abstract

The helical layers generated in the manufacturing process of a composite polymer through filament winding play an important role in structural components manufac- tured using this process, as they are responsible for providing axial mechanical strength and flexural resistance to the structure. From a construction perspective, the cross-winding method forms regions resembling mosaics in a diamond shape. The generation of these mosaics is often not considered in structural calculation analyses, and when they are, they are typically modeled using shell elements. Although shell models adequately capture the size and shape of these mosaics, due to their geomet- ric limitations, they are incapable of faithfully representing the interlace regions. In this study, a three-dimensional micro-mechanical numerical model was developed using finite element tools, to more accurately represent the interlace regions. Additionally, a shell model with the same geometric shapes and layer configurations as the three- dimensional model was developed to compare stress and deformation differences between the two models. Both models were subjected to a radial uniaxial pressure load. It was observed that the stresses in the helical layers of the three-dimensional models behaved differently from the shell models in the interlace regions. In the former, higher compression stresses and tensile stress values were identified than those in the shell models. Such results indicate that these zones are susceptible to initiating failures, highlighting the importance of three-dimensional approaches for designing structures with this type of arrangement. Three-dimensional models provide more reliable results when considering interlace regions, as these areas may be prone to failure.