Model calculation of the stress-strain relationship of polycrystalline Fe-Pd and 3D phase transformation diagram of ferromagnetic shape memory alloys

Robert Liang; Taishi Wada; Tetsuya Tagawa; Minoru Taya

doi:10.1117/12.474977

11 July 2002 Model calculation of the stress-strain relationship of polycrystalline Fe-Pd and 3D phase transformation diagram of ferromagnetic shape memory alloys

Robert Liang, Taishi Wada, Tetsuya Tagawa, Minoru Taya

Author Affiliations +

Proceedings Volume 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics; (2002) https://doi.org/10.1117/12.474977
Event: SPIE's 9th Annual International Symposium on Smart Structures and Materials, 2002, San Diego, California, United States

Abstract

A micromechanics approach is proposed to calculate the stress-strain relationship of a polycrystalline Fe-Pd ferromagnetic shape memory alloy. It is modeled as consisting of spherical grains, which are grouped according to their orientations with respect to the loading axis. Therefore, the internal stress and elastic energy are accumulated as straining proceeds due to the strain differences between differently oriented grains. In the present study, the energy dissipation of the interface movement is also considered. Furthermore, a stress-magnetic field-temperature phase transformation diagram is constructed. The magnetic field induced transformation is found to be insignificant based on thermodynamics model. The cases of Fe-Pd and NiMnGa systems are examined for 3D phase transformation diagram.

Citation Download Citation

Robert Liang, Taishi Wada, Tetsuya Tagawa, and Minoru Taya "Model calculation of the stress-strain relationship of polycrystalline Fe-Pd and 3D phase transformation diagram of ferromagnetic shape memory alloys", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); https://doi.org/10.1117/12.474977

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