Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analysis of Shape Memory Alloy Composites Using Micromechanical Models
Submission Author:
Pedro Manuel Calas Lopes Pacheco , RJ , Brazil
Co-Authors:
Alencar Bernardino, Lucas Vignoli, Pedro Manuel Calas Lopes Pacheco, Marcelo Savi
Presenter: Lucas Vignoli
doi://10.26678/ABCM.COBEM2023.COB2023-0415
Abstract
Composite materials have been widely explored over the years due to lightweight, fatigue life, corrosion resistance, high stiffness and strength. Many investigations can be found in the literature to model their macromechanical effective properties using micromechanical approaches. On the other hand, shape memory alloys are relatively recent and have unique capabilities due to solid phase transformation generating shape memory effect and pseudoelastic effects. The use of composite materials with embedded shape memory alloy wires, using both materials together, began to be explored in recent years showing promising mechanical behaviors that can be applied in several areas as biomedical, automation and aerospace applications. In order to evaluate macromechanical behavior of a shape memory alloy composite (SMAC), a novel constitutive model with linear phase transformation kinetics is derived for the SMAC. Finite element analysis is developed for a verification of the proposed analytical model considering a micromechanical unit cell. The unit cell consists of a circular cross-section wire surrounded by a polymeric matrix. Analytical and numerical results for uniaxial loads show good agreements. Stress-strain curves are obtained to evaluate pseudoelastic effect and the related hysteresis loops represent the amount of energy dissipated, which is useful for structural vibration applications. The proposed analytical model can be considered a useful and reliable tool to efficiently design SMAC elements.
Keywords
Shape Memory Alloys Composites, Constitutive Models, hybrid composites
