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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