Estudo do comportamento termomecânico de uma liga Ni-Ti com memória de forma usando análise dinâmico-mecânica (DMA).

Abstract

The aim of this work is to manufacture and study the dynamic properties of a NiTi shape memory alloy. After production through Plasma Skull Push Pull method the material was cut off and hot-rolled to achieve plate specimens with different thickness. The physical characterization was accomplished through microhardness test and electrical resistance as a function of temperature, while the dynamic tests were carried out using a commercial dynamic mechanical analyzer (DMA). The studied SMA has demonstrated a considerable damping capacity, mainly during phase transformation, when it presented a peak of energy absorption. Besides, the storage modulus of the samples revealed an important increase during transformation, differentiating the two phases. It was also performed comparative analyses between SMA and classic structural materials. The superior dynamic properties of this smart material were observed. Seeking general applications in Oil and Gas Industry, a prospective analysis of applicability of these materials was performed.