ALVES, R. M. N.; http://lattes.cnpq.br/1830047945600025; ALVES, Railson de Medeiros Nóbrega.
Resumo:
For many years, cellular structures, such as honeycombs, are being studied
because these arrays have numerous possibilities of structural applications, such as
impact load damping. Most materials with cellular structures are made of aluminum,
and are widely used in the naval and aviation industries. However, aluminum cellular
structures have the disadvantage that they can accumulate permanent deformations
(plastic regime), irreversible even when subjected to heating. In this context, the
objective of, this research is the fabrication and thermomechanical characterization of
cellular structures of a Cu-Al-Mn Shape Memory Alloy (SMA) produced by precision
casting with four different cell geometries (honeycomb, reentrant, diamond and “S”-
structure) with two thicknesses (1 mm and 0.5 mm). The obtained results showed that
the cellular structures presented phase transformation characteristic of the Shape
Memory Effect (SME) phenomenon with deformation at room temperature followed by
heating. The isothermal mechanical compression tests showed the functional behavior
related to the EMF and Superelasticity (SE) phenomena. It was also found that 0.5 mm
thick cell structures require lower levels of maximum force at the end of each 5%
compression cycle, around 1/3 to 1/10, compared to 1 mm thicknesses. Finally, almost
all cell structures produced showed good deformability and can be used as shock
absorbers due to their behavior verified in compression tests.