Eventos Anais de eventos
DINAME 2023
XIX International Symposium on Dynamic Problems of Mechanics
Nonlinear dynamics of a magnetic shape memory alloy oscillator
Submission Author:
Jean Muniz de Souza , RJ , Brazil
Co-Authors:
Jean Muniz de Souza, Luciana Loureiro da Silva Monteiro, Marcelo Savi
Presenter: Jean Muniz de Souza
doi://10.26678/ABCM.DINAME2023.DIN2023-0031
Abstract
Magnetic shape memory alloys (MSMAs) represent a class of smart materials that can exhibit large magnetic field induced strain when subjected to magneto-mechanical loadings. The induced strain can be achieved by martensitic variant reorientation or field induced phase transformation. The martensitic reorientation mechanism has the advantage of the possibility of high frequency actuation, since it does not rely on phase transformation between strain cycles, which would demand cooling periods. This kind of behavior is not extensively explored in the literature, which is the objective of this work. In this regard, an MSMA single degree-of-freedom nonlinear oscillator is investigated, exploiting the system response under different conditions. A phenomenological model is employed to describe the MSMA behavior, proposing a dynamical system model. Numerical simulations are carried out using the fourth order Runge-Kutta method. Simulations show that the application of a bias magnetic field on a MSMA based dynamical system can lead to changes in the oscillation period and the movement amplitude of the system. Depending on the excitation frequency, a chaotic-like behavior is achieved. This work points to the potential use of MSMAs to modify the dynamical characteristics of a system using a bias magnetic field, providing useful information.
Keywords
Magnetic shape memory alloys, martensitic variant reorientation, Dynamic system, Nonlinear
