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Adaptive Composites with Embedded Shape Memory Alloy Wires

Published online by Cambridge University Press:  15 February 2011

J.A. Balta ,
M. Parlinska ,
V. Michaud ,
R. Gotthardt  and
J-A.E. Manson
J.A. Balta
Affiliation:
Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland Polymer and Composite Technology Laboratory (LTC), Materials Department
M. Parlinska
Affiliation:
Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland Atomic Engineering Institute (IGA), Physics Department
V. Michaud
Affiliation:
Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland Polymer and Composite Technology Laboratory (LTC), Materials Department
R. Gotthardt
Affiliation:
Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland Atomic Engineering Institute (IGA), Physics Department
J-A.E. Manson
Affiliation:
Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland Polymer and Composite Technology Laboratory (LTC), Materials Department
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Abstract

Pre-strained martensitic Shape Memory Alloy wires embeddedz into a composite material act against the stiffness of the host material if they are heated above their retransformation temperature, biasing their strain recovery. As a result, recovery stresses are generated in the composite, leading to a shift in resonance vibration frequency if the wires are placed along the neutral axis of a composite beam. Guidelines for quantification of the effects produced, as a function of SMA wire composition, volume fraction, level of pre-strain, and of host material stiffness are not available yet. In order to investigate the governing mechanisms of activation, adaptive composite materials based on Kevlar fiber reinforced epoxy matrices have been produced by embedding thin Shape Memory Alloy wires, 150 microns in diameter, during processing in an autoclave. A mold was specially designed to pre-strain the SMA wires and prevent their recovery during the cure cycle. Values of the degree of activation in the composite materials, in terms of maximal recovery force and of the corresponding maximal resonance vibration frequency shift will be presented as a function of the stiffness of the host material and SMA volume fraction. Preliminary guidelines for the optimization of these materials will thus be given.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 604: Symposium LL – Materials for Smart Systems III , 1999 , 141
Copyright
Copyright © Materials Research Society 2000

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