Desenvolvimento de material compósito multifuncional incorporando telas de liga com memória de forma Ni-Ti-Cu obtidas por fundição de precisão.

Abstract

For centuries, metals and their alloys have played an extremely important role in the category of structural materials, but currently the development and application of hybrid materials is growing significantly. Most polymer composite materials are used at temperatures close to ambient temperature, since at higher temperatures a significant loss in mechanical properties of this kind of material is observed. Thus, the aim of this work is the development of a multifunctional composite material with SMA Ni-Ti-Cu meshes, obtained by precision casting, added in a conventional composite material (GFRP), in which the meshes act as an “active" or "smart" reinforcement. In this work the multifunctional composites having different configurations are analyzed from their manufacture up to their thermomechanical characterization. The results obtained showed that the SMA meshes showed phase transformation and increased stiffness close to room temperature, in contrast to what happens to the GFRP used whose glass transition temperature (Tg) is just above room temperature. Isothermal bending tests showed that the insertion of the SMA mesh in the composite material led to a significant increase in the mechanical properties evaluated in the two configurations developed (with the mesh in the neutral line and outside the neutral line). Finally, we conclude that the insertion of the SMA mesh in the neutral line of the composite material proved to be the best configuration for multifunctional hybridization of the composite material.