International Journal of Applied Electromagnetics and Mechanics - Volume 23, issue 1-2

Authors: Krevet, B. | Kohl, M. | Brugger, D.

Article Type: Research Article

Abstract: A combination of different finite element (FEM) programs is used to simulate the coupled thermo-magneto-mechanical properties of a Ni-Mn-Ga double-beam cantilever. First, simulations of the static and dynamic temperature distributions are presented for different electrical heating conditions taking into account the effects of martensitic phase transformation. The results are used for a self-consistent mechanical deflection analysis of the actuator in the inhomogeneous magnetic field of a permanent magnet. The influence of the …shape recovery, ferromagnetic and Lorentz force on the actuator performance are discussed. Show more

DOI: 10.3233/JAE-2006-724

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 23, no. 1-2, pp. 125-131, 2006

Authors: Lelatko, Józef | Morawiec, Henryk

Article Type: Research Article

Abstract: Models elaborated for the metal-matrix composite materials were modified in order to enable the control of the deformation properties of the Cu-Al-Nb type shape memory alloys containing significant number of primary particles. The modified model of the continuum mechanics approach based on the effective medium approximations and supplemented by the dislocation plasticity model enabled analysis of the deformation course of the Cu-Al-Nb alloys. By comparing the simulated and experimental stress – strain curves for …these alloys, the effect of particle size, volume fraction and their elastic properties on the deformation response is given. This model allows showing that hardening of the alloy during deformation results from the presence of hard and elastic particles in the martensite matrix as well as dislocations formed at the partial accommodation of the residual stresses created during the alloy quenching. Show more

Keywords: Cu-Al-Nb alloys, high temperature shape memory alloys, deformation, strengthening, modeling

DOI: 10.3233/JAE-2006-723

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 23, no. 1-2, pp. 133-137, 2006

Authors: Creton, Nicolas | Hirsinger, Laurent

Article Type: Research Article

Abstract: A predictive model of field-induced strain in Ni-Mn-Ga ferromagnetic shape memory alloys is proposed. The action of both biaxial magnetic field and mechanical stress on the martensitic rearrangement in a Ni-Mn-Ga single crystal are modelled. Yield surfaces of starting rearrangement are simulated. They show how applied mechanical stress helps or opposes to the applied magnetic field to make the rearrangement easier or harder. The results are fully compatible with the experiments of Müllner et al. [8] …describing the action of a rotating magnetic field. Show more

Keywords: Magneto-mechanical coupling, shape memory alloy, model

DOI: 10.3233/JAE-2006-732

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 23, no. 1-2, pp. 139-144, 2006