Fabricação e caracterização termomecânica de molas ou arruelas belleville de ligas com memória de forma.

Abstract

Shape Memory Alloys (SMA) are materials that have an important applicative potential as thermomechanical actuators in several fields, such as oil and gas Industry, aerospatial, medical and dental and electrical energy. This potential is due to the ability of SMA for generation of mechanical force through the Shape Memory Effect (SME). This work had the main objective of manufacturing Belleville washer shape memory actuators of Ni-Ti SMA and evaluates their performance, aiming applications in smart bolted joints. For this, it has been selected a Ni-Ti SMA of equiatomic composition, which corresponds a weight nominal composition of 55Ni-45Ti. From this SMA, the actuators have been produced by adapting the Plasma Skull Push Pull method (PSPP). Once improved the manufacturing technique of SMA actuators, tests of force generation as a function of temperature were accomplished using a universal testing machine. The obtained results shown maximum force generation of 6kN and a residual force around 1kN, indicating a large potential for application of these materials for development of real applications, mainly in the oil and gas Industry.