Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
SUPERELASTIC TUBULAR STRUCTURES OF CU-AL-MN SHAPE MEMORY ALLOY OBTAINED BY INVESTMENT CASTING: A PRELIMINARY STUDY USING 3D PRINTED ABS MODELS
Submission Author:
Railson de Medeiros Nóbrega Alves , PB
Co-Authors:
Railson de Medeiros Nóbrega Alves, Leonardo Feitosa Jordão, RODINEI MEDEIROS GOMES, Danielle Cavalcante, Carlos Jose de Araujo
Presenter: Carlos Jose de Araujo
doi://10.26678/ABCM.COBEM2023.COB2023-0160
Abstract
For many years, cellular structures, such as honeycombs, have been studied due to their numerous possibilities for structural applications, such as dampening of impact loads. Most materials with cellular structures are made of aluminum and thus have the disadvantage of possibly accumulating permanent deformations (plastic regime), irreversible even when subjected to heating. With the development of new advanced engineering materials, smart materials emerged, aiming for better performance in their applications. Among these materials are Shape Memory Alloys (SMA), which are metallic materials capable of withstanding large inelastic deformations, which can be recovered by heating or mechanical unloading. The differentiated behavior of SMAs compared to conventional metals is associated with two phenomena: the shape memory effect and superelasticity. Advantages of Cu-based SMA include amongst other features, low cost of production, ease in manufacturing processes and ability to vary the achieved properties through alloying additions. Cellular structures made from a SMA are particularly intriguing due to their potential to provide SME and/or SE in a lightweight material. Thus, this work aims to evaluate the behavior of three arrangements of cellular tubular structures (unitary, triangular, and square) manufactured from a Cu71.5-Al17.5-Mn11 (%at) SMA. The Cu-Al-Mn SMA was manufactured using an induction melting furnace, where a 400 grams ingot was obtained. The tubular parts were obtained by an investment casting process using the Power Cast 1700 EDG machine. In this process, a piece of the previously prepared SMA ingot is inserted into a ceramic crucible and re-melted by induction melting with subsequent injection by centrifugation into the ceramic mold obtained from a 3D printed ABS model. After obtaining the tubular structures, characterization was carried out, evaluating dimensional parameters and thermal and mechanical behavior of the structures. The results showed that the manufactured SMA presented superelastic characteristics at room temperature. The structures manufactured by the investment casting process presented acceptable dimensional characteristics and satisfactory mechanical behavior under compression, revealing a good effectiveness in dissipating mechanical energy, enhancing its possible applicability as impact dampers.
Keywords
Shape memory alloys (SMA), Cu-Al-Mn alloys, Tubular structures, Superelasticity, investment casting
