Thermomechanical Behavior of CuAlMn SMA Cellular Structures Obtained by Rapid Investment Casting
Railson M. N. Alves,
Paulo C. S. Silva,
Danielle G. L. Cavalcante,
Danniel F. Oliveira,
Carlos J. De Araújo,
João M. P. Q. Delgado,
Antonio G. B. Lima
Affiliations
Railson M. N. Alves
Center of Technology, Department of Mechanical Engineering, Federal University of Paraíba, Cidade Universitária, Campus I, Castelo Branco, João Pessoa 58051-900, PB, Brazil
Paulo C. S. Silva
Center of Science and Technology, Department of Mechanical Engineering, Federal University of Campina Grande, Rua Aprígio Veloso, 882, Campina Grande 58429-900, PB, Brazil
Danielle G. L. Cavalcante
Center of Technology, Department of Mechanical Engineering, Federal University of Paraíba, Cidade Universitária, Campus I, Castelo Branco, João Pessoa 58051-900, PB, Brazil
Danniel F. Oliveira
Center of Technology, Department of Mechanical Engineering, Federal University of Paraíba, Cidade Universitária, Campus I, Castelo Branco, João Pessoa 58051-900, PB, Brazil
Carlos J. De Araújo
Center of Science and Technology, Department of Mechanical Engineering, Federal University of Campina Grande, Rua Aprígio Veloso, 882, Campina Grande 58429-900, PB, Brazil
João M. P. Q. Delgado
CONSTRUCT-LFC, Civil Engineering Department, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
Antonio G. B. Lima
Center of Science and Technology, Department of Mechanical Engineering, Federal University of Campina Grande, Rua Aprígio Veloso, 882, Campina Grande 58429-900, PB, Brazil
Shape memory alloy (SMA) bidimensional cellular structures (CSs) have a great potential application in attenuation of vibrations due to reversible martensitic phase transformations induced by thermal or mechanical loading. This work aims to produce a thermal and mechanical characterization of CuAlMn SMA CSs produced by rapid investment casting (RIC). Structures with different unit cell geometries and thicknesses of 0.5 mm and 1 mm were manufactured by centrifugal RIC. Compression tests at different temperatures were performed on the CS to verify its thermomechanical behavior. We observed that a CS with a thickness of 0.5 mm presents greater mechanical strength and lower levels of maximum force at the end of each 5% compression cycle, ranging from approximately 1/10 to 1/3, compared to structures with a thickness of 1 mm. Among all the CS configurations, the re-entrant structure exhibited higher levels of force, with higher secant stiffness and dissipated energy. The structures resisted the application of compressive forces that varied between 125 N and 500 N for the 0.5 mm CS and between 500 N and 5500 N for the 1 mm CS. Therefore, the results showed that all CuAlMn SMA CSs produced by RIC exhibited sufficient strength to attain strain levels of up to 5% at different temperatures, and that the unit cell geometry can be used to tune the mechanical properties.
