Análise da influência do uso de filetes de núcleo na resistência a tração de um compósito estrutural

Abstract

Composite materials are taking more and more place in the market, due to their intrinsic characteristic of combining materials, and, consequently, improved properties. Considering the growing scenario of use of composite mate rials, it becomes increasingly relevant to study the mechanical behavior of these materials considering different scenarios. One of them is a typical case that occurs in the wind industry, the use of core fillets that are used to make adjustments during th e rotor blade manufacturing process. This work sought to evaluate the impact of the use of fillets on the tensile strength of a sandwich type structural composite with a polymer matrix and reinforced with glass fiber. We manufacture three different types o f a laminate by the vacuum assisted infusion molding process. In the first type, we use the intact PET foam core; in the second, we used core fillets, also made of PET foam, positioned in the longitudinal direction and in the third, we used core fillets po sitioned in the transverse direction. The 15 samples were prepared and submitted to the tensile test according to ASTM D 3039/D 3039M. It was observed that the presence of fillets has little influence on the tensile strength of the laminate. The presence o f fillets in the longitudinal direction implies an increase in the strength of the material because the space between fillets is filled by resin, which has a higher tensile strength than the PET foam itself. The presence of fillets in the transverse direct ion implies a slight reduction in the tensile strength of the laminate.