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Proceedings Paper

Thermomechanical characterization and development of SMA-embedded CFRP composites with self-damage control
Author(s): Byung-Koog Jang; Ya Xu; Ryutaro Oishi; Hideki Nagai; Hitoshi Yoshida; Yoshio Akimune; Kazuhiro Otsuka; Teruo Kishi
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Paper Abstract

The focus of this work is the thermomechanical characterization and effect of damage recovery on the pre-strained SMA wire embedded CFRP composites for developing the smart composites with self-damage control. The SMA utilized in this work is a Ni-45at percent Ti wire with a diameter of 0.4 mm. A steel mold was specially designed to embed the pre-strained TiNi wire into CFRP preperg and prevent their recovery during the cure cycle. TiNi/CFRP composites were fabricated by hot-pressing in the temperature range of 150-180 degrees C by controlling the applied pressure. The overall research is divided into four parts: fabrication of SMA wire embedded CFRP composites, experimental characterization of thermomechanical behavior on SMA wire by electrical heating, recovery effect of self-damage control in composites and sensing effect by detecting the electrical resistance at SMA wire. Compressive recovery force induced by thermomechanical actuation of SMA depends on pre-strained level and volume fraction of TiNi. The hot-pressed TiNi/CFRP specimens were loaded under tensile test in order to induce a transverse crack or partial damage. Specially, transverse crack easily happen at 90 degrees stacking CFRP layers. The damage degree due to generation of transverse cracks is quantified by real-time measurements of electrical resistance of SMA in composites during tensile load. After electrical heating, the generated transverse cracks at composites successfully repaired due to compressive force introduced by pre-strained TiNi wires and resulting in the self-damage recovery effect.

Paper Details

Date Published: 11 July 2002
PDF: 9 pages
Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474974
Show Author Affiliations
Byung-Koog Jang, National Institute of Advanced Industrial Science and Technology (Japan)
Ya Xu, National Institute of Advanced Industrial Science and Technology (Japan)
Ryutaro Oishi, National Institute of Advanced Industrial Science and Technology (Japan)
Hideki Nagai, National Institute of Advanced Industrial Science and Technology (Japan)
Hitoshi Yoshida, National Institute of Advanced Industrial Science and Technology (Japan)
Yoshio Akimune, National Institute of Advanced Industrial Science and Technology (Japan)
Kazuhiro Otsuka, National Institute of Advanced Industrial Science and Technology (Japan)
Teruo Kishi, National Institute for Materials Science (Japan)


Published in SPIE Proceedings Vol. 4699:
Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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