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Active Stiffening of Composite Materials by Embedded Shape-Memory-Alloy Fibres

Published online by Cambridge University Press:  10 February 2011

J.-E. Bidaux ,
J.-A. E. Månson  and
R. Gotthardt
J.-E. Bidaux
Affiliation:
Laboratoire de Technologie des Composites et Polymères
J.-A. E. Månson
Affiliation:
Laboratoire de Technologie des Composites et Polymères
R. Gotthardt
Affiliation:
Institut de Génie Atomique Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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Abstract

The use of shape-memory-alloy (SMA) fibres to actively changethe stiffness of a composite beam is investigated on a model system composed of an epoxy matrix with a series of embedded pre-strained NiTi fibres. Stiffness changes are detected through shifts in the natural vibration frequency of the beam. When electrically heated, the pre-strained NiTi fibres undergo a phase transformation. Since the shape recovery associated with the transformation is restrained by the constraints of both the matrix and the clamping device, a force is generated. This force leads to an increase in the natural vibration frequency of the composite beam. Depending on the degree of fibre pre-strain, either ordinary martensite, R-phase or a mixture of the two can be stress-induced. It is found that the R-phase gives rise to the largest change in vibration frequency for a given temperature increase and the most reversible behaviour. Its low transformation strain is also more favourable for fibre-matrix adhesion. The effect of stress relaxation in the polymer matrix on the composite response is discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 459: Symposium Y – Materials for Smart Systems II , 1996 , 107
Copyright
Copyright © Materials Research Society 1997

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References

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