11 July 2002 Thermomechanical characterization and development of SMA-embedded CFRP composites with self-damage control
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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.
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Byung-Koog Jang, Byung-Koog Jang, Ya Xu, Ya Xu, Ryutaro Oishi, Ryutaro Oishi, Hideki Nagai, Hideki Nagai, Hitoshi Yoshida, Hitoshi Yoshida, Yoshio Akimune, Yoshio Akimune, Kazuhiro Otsuka, Kazuhiro Otsuka, Teruo Kishi, Teruo Kishi, } "Thermomechanical characterization and development of SMA-embedded CFRP composites with self-damage control", Proc. SPIE 4699, Smart Structures and Materials 2002: Active Materials: Behavior and Mechanics, (11 July 2002); doi: 10.1117/12.474974; https://doi.org/10.1117/12.474974

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