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Proceedings Paper

Passive damping of composites with embedded shape memory alloy wires
Author(s): Rui de Oliveira; Enrico Bigi; Antoine Sigg; Véronique Michaud; Jan-Anders E. Månson
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Paper Abstract

NiTi alloy wires were embedded during the infusion processing of woven carbon fibre reinforced plastic (CFRP) composite plates with the purpose to passively increase their damping. Two types of NiTi wires, having the same diameter of 203 μm, were considered, one superelastic at room temperature, the other one martensitic. For the first one, a martensitic transformation was induced by applying a pre-strain of 2.5% before embedding the wires. The coexistence of austenite and martensite should provide damping through the mobility of boundaries between the two phases. For the second type of wires, the enhancement of damping was based on the presence of martensite. The passive damping effect produced by the shape memory alloy (SMA) wires was evaluated from free vibration tests on composite plates, neat or with 5% of volume fraction of SMA wires. Resonance frequency and damping ratio were measured as a function of temperature. Improvement in damping was verified, at room temperature, for both types of SMA wires and was observed to be dependent on vibration amplitude. For small-amplitude free vibrations, pre-strained superelastic wires presented more interest as they provided a damping increase of around 87%. The effect however depends on temperature.

Paper Details

Date Published: 30 March 2010
PDF: 11 pages
Proc. SPIE 7644, Behavior and Mechanics of Multifunctional Materials and Composites 2010, 76440K (30 March 2010); doi: 10.1117/12.847570
Show Author Affiliations
Rui de Oliveira, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Enrico Bigi, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Antoine Sigg, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Véronique Michaud, Ecole Polytechnique Fédérale de Lausanne (Switzerland)
Jan-Anders E. Månson, Ecole Polytechnique Fédérale de Lausanne (Switzerland)


Published in SPIE Proceedings Vol. 7644:
Behavior and Mechanics of Multifunctional Materials and Composites 2010
Zoubeida Ounaies; Jiangyu Li, Editor(s)

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