Análise por simulação numérica de material compósito submetido a impacto

Abstract

Composite materials are of the utmost importance for the aeronautical industry. Therefore, the knowledge of its properties and their behavior towards mechanical loads are crucial to implement them in aeronautical projects. When subjected to impact, composite materials may suffer of the delamination phenomenon (two composite laminates separate at the interface), thus, a structural failure of the component or the structure may occur. Through acoustic elasticity, it is possible to develop analytic models that relate variables such as stress and propagation velocity, which is fundamental to understand the behavior of the mechanic wave throughout the material. The use of the commercial software ANSYS® made possible numerical impact simulations on a beam made of composite materials, in order to identify and quantify delamination. It was also proved that the different properties among the materials that make up the composite material influence delamination. Because the bigger the acoustic impedance difference, the lower the traction force will be on the materials’ interface.