Magneto-mechanical actuation of ferromagnetic shape memory alloy/epoxy composites

Published on Jun 19, 2015in Composites Science and Technology7.094
· DOI :10.1016/J.COMPSCITECH.2015.04.009
Susanne Glock4
Estimated H-index: 4
(EPFL: École Polytechnique Fédérale de Lausanne),
Luis P. Canal11
Estimated H-index: 11
(EPFL: École Polytechnique Fédérale de Lausanne)
+ 1 AuthorsVéronique Michaud49
Estimated H-index: 49
(EPFL: École Polytechnique Fédérale de Lausanne)
Sources
Abstract
Ferromagnetic shape memory alloys (MSMA) exhibit magnetic field- and stress-induced twinning when processed into single crystals, but are brittle and difficult to shape. Embedding slender single crystalline MSMA elements into a polymer matrix can thus provide composites with adjustable magnetic strain actuation behavior. Ni-Mn-Ga single crystalline rods were characterized for their magneto-mechanical behavior and embedded in two different types of epoxy matrices with different volumetric fractions. The magnetic actuation of the composites was measured and shown to depend on the Ni-Mn-Ga volumetric fraction and the matrix stiffness. This behavior was well predicted by finite element simulations of the composite using a simple material model for the strain of the MSMA as a function of the magnetic field and applied stresses. Guidelines for composite behavior prediction could thus be proposed. (C) 2015 Elsevier Ltd. All rights reserved.
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