| Issue |
J. Phys. IV France
Volume 05, Number C8, Décembre 1995
International Conference on Martensitic Transformations – ICOMAT 95
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|
|---|---|---|
| Page(s) | C8-1177 - C8-1182 | |
| DOI | https://doi.org/10.1051/jp4/1995581177 | |
| Published online | 14 July 2014 | |
Vibration Frequency Control of a Polymer Beam Using Embedded Shape-Memory-Alloy Fibres
1
Laboratoire de Technologie des Composites et Polymères, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
2
Institut de Génie Atomique, Ecole Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
The possibility to actively change the natural vibration frequencies of a composite beam by electrically activating a series of embedded shape-memory-alloy fibres is investigated. A model system composed of an epoxy matrix with prestrained shape-memory-alloy fibres is used. The natural frequencies of vibration of the composite are measured in a clamped beam configuration. When electrically heated, the fibres undergo a reverse martensite to austenite transformation. Since this transformation is restrained by the constraints of both the matrix and the clamping device, a recovery force is generated. This force produces an increase of the natural frequency of vibration of the whole composite beam. Vibration frequency changes of more than 50% are obtained. The glass-to-rubber transition of the matrix affects the reversibility of the effect. The role of the matrix thermal expansion is discussed.
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