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Abstract

Ferromagnetic shape memory alloy (FSMA) composites composed of a ferromagnetic material and a shape memory alloy (SMA) are key material systems for fast-responsive and compact actuators.

The function of ferromagnetic material is to induce magnetic force which is then used to induce the stress in the SMA, resulting in the stress-induced marten site transformation (SIM), i.e. change in the Young’s modulus, stiff (austenite) to soft (martensite). This SIM-induced phase change causes larger deformation in the SMA, which is often termed as “superelastic”.

This paper discusses a simple model by which the stress and strain field in the FSMA composites subjected to bending and torsion loading are computed with the aim of identifying the optimum geometry of FSMA composites. The results of the present analytical study are utilized to design torque actuator (bending of FSMA composite plate) and spring actuator (torsion of helical FSMA composite spring).

Keywords

shape memory alloy ferromagnetic material stress-induced martensite transformation superelasticity bending plate coil spring

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Design of Ferromagnetic Shape Memory Alloy Composites

Abstract

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