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Proceedings Paper

Development of damage suppression system using embedded SMA foil in CFRP laminates
Author(s): Toshimichi Ogisu; Masato Nomura; Norio Ando; Junji Takaki; Masakazu Kobayashi; Tomonaga Okabe; Nobuo Takeda
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Paper Abstract

Some recent studies have suggested possible applications of Shape Memory Alloy (SMA) for a smart health monitoring and suppression of damage growth. The authors have been conducting research and development studies on applications of embedded SMA foil actuators in CFRP laminates as the basic research for next generation aircrafts. First the effective surface treatment for improvement of bonding properties between SMA and CFRP was studied. It was certified that the anodic oxide treatment by 10% NaOH solution was the most effective treatment from the results of peel resistance test and shear strength test. Then, CFRP laminates with embedded SMA foils were successfully fabricated using this effective surface treatment. The damage behavior of quasi-isotropic CFRP laminates with embedded SMA foils was characterized in both quasi-static load-unload and fatigue tests. The relationship between crack density and applied strain was obtained. The recovery stress generated by embedded SMA foils could increase the onset strain of transverse cracking by 0.2%. The onset strain of delmination in CFRP laminates was also increased accordingly. The shear-lag analysis was also conducted to predict the damage evolution in CFRP laminates with embedded SMA foils. The adhesive layers on both sides of SMA foils were treated as shear elements. The theoretical analysis successfully predicted the experimental results.

Paper Details

Date Published: 11 July 2001
PDF: 12 pages
Proc. SPIE 4333, Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics, (11 July 2001); doi: 10.1117/12.432778
Show Author Affiliations
Toshimichi Ogisu, Fuji Heavy Industries Ltd. (Japan)
Masato Nomura, Fuji Heavy Industries Ltd. (Japan)
Norio Ando, Fuji Heavy Industries Ltd. (Japan)
Junji Takaki, Fuji Heavy Industries Ltd. (Japan)
Masakazu Kobayashi, Univ. of Tokyo (Japan)
Tomonaga Okabe, Univ. of Tokyo (Japan)
Nobuo Takeda, Univ. of Tokyo (Japan)

Published in SPIE Proceedings Vol. 4333:
Smart Structures and Materials 2001: Active Materials: Behavior and Mechanics
Christopher S. Lynch, Editor(s)

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