J. Phys. IV France 11 (2001) Pr8-129-Pr8-134
Vibrational response of adaptive compositesM. Parlinska1, J.A. Balta2, V. Michaud1, J.-E. Bidaux3, J.A. Månson2 and R. Gotthardt1
1 Institut de Génie Atomique, Département de Physique, EPFL, 1015 Lausanne, Switzerland
2 Laboratoire de Technologie des Composites et Polymères, Département des Matériaux, EPFL, 1015 Lausanne, Switzerland
3 Groupe Matériaux et Conception, route du Rawyl 47, École d'Ingénieurs du Valais, 1950 Sion, Switzerland
Composite laminates containing pre-deformed NiTiCu wires embedded in an epoxy matrix reinforced with Kevlar fibres were manufactured and tested. These materials change their properties, for example vibration resonance frequency or modulus in response to a temperature variation. When heated by direct electrical current above the transformation temperature, the pre-deformed shape memory alloy (SMA) wires try to recover their shape and since they are restrained by a stiff matrix and clamping, a stress is created. As a result, a change in the resonance frequency of the composite occurs. The magnitude of the recovery stress and corresponding resonance frequency shift was found to increase with the SMA wire volume fraction and to decrease with the thickness of the host composite layers between the wires and the constraining grips.
© EDP Sciences 2001