Magnetization- and strain-dependent free energy model for FEM simulation of magnetic shape memory alloys

Autor: Stefan Seelecke, Phillip Morrison, B. Krevet, Manfred Kohl
Rok vydání: 2008
Předmět:
Zdroj: The European Physical Journal Special Topics. 158:205-211
ISSN: 1951-6401
1951-6355
Popis: A free-energy function is constructed, which couples strain and magnetic moments in ferromagnetic shape memory alloys. The associated Gibbs function is used to calculate time-dependent transition probabilities between martensite variants in a magnetic field under applied stress. By keeping track of the variant fractions, the evolution of strain and magnetization is determined. The simulation model is built in a finite element program for structural analysis, in order to simulate magnetic field-dependent strain and magnetization characteristics of a test actuator. The influence of material parameters and sample geometry is discussed.
Databáze: OpenAIRE