Modeling a Shape Memory Alloy Honeycomb Vibration Absorber Using the Finite Element Method
Gabriel Averbug1; Ricardo Alexandre Amar Aguiar1; Silvio de Barros1; Pedro Manuel Calas Lopes Pacheco1; Marcelo Amorim Savi2
1 CEFET/RJ - Programa de Pós-Graduação em Engenharia Mecânica e Tecnologia de Materiais; 2 COPPE/UFRJ - Programa de Pós-Graduação em Engenharia Mecânica
doi:10.20906/CPS/CON-2016-1487
Resumo
Shape memory alloys (SMAs) are smart materials employed in several applications due to their adaptive characteristics being of special interest in engineering. Pseudoelasticity effect occurs in austenitic SMAs where a hysteretic behavior is observed in the stress-strain curve. The area inside the hysteresis loop is associated with energy dissipation during loading-unloading cycles. Since the volumetric density of dissipated energy of nickel-titanium and copper-based alloys is significant, they have been broadly applied in vibration systems. In this regard, an optimized geometric design is a great challenge for the construction of shape memory alloy vibration absorbers. This work presents a numerical model based on the finite element method developed to study the energy dissipation capability of an SMA S-shape absorber connected to aluminum plates to form a honeycomb structure. A constitutive model with internal variables describes pseudoelastic behavior of SMA. The proposed model can be used as a tool for analyzing phase transformation distribution and to optimize the geometry of the SMA vibration absorbers in order to maximize the energy dissipation capability. Numerical simulations show that the SMA S-shape absorber can be used as an efficient absorber for vibration reduction.
Palavras-chave: Shape Memory Alloys; Pseudoelasticity; Honeycomb; Vibration Absorber; Modeling; Numerical Simulation; Finite Element Method