Estudo do gradiente de resistência em compósito de mecha híbrida vidro/Kevlar após impacto de baixa velocidade

Abstract

Composite materials are high structural efficiency that are compromised when suffer impact loads. Among the kind of impacts, the low speed kind is considered a dangerous effort, because they are more common impacts to occur and cause damages that are not always checked by naked eyes or that may be hidden by surface finishes. Therefore, the present study objective was to analyze bending residual resistance in three-point, as well as to evaluate the presence of the tissue type of hybrid wick in a composite laminate of ester vinyl polymer matrix, subjected to low speed impacts (Drop Test). The impact tests were performed using two energies (61 J and 76 J) until the drilling of the specimens. As a result, was verified good impact strenght at the laminate and the properties three-point bending strenght, stiffness and strenght were slightly changed after impact. In order to better understand these behaviors, comparative studies are necessary. At this purpose, another similar laminate composite, presented in the literature, was used at this analysis. Ended the studies, it was seen that the hybrid wick tissue, straightly influenced the results, with an increase impact strength and damaged area reduction.