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12 June 2000 Suppression of postbuckling deflection and panel flutter using shape memory alloy
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A novel concept proposed is the use of SMA to reduce the panel thermal deflection and linear flutter responses. SMA has the unique ability of recovering large prestrain completely when the alloy is heated. During the recovery process, a large tensile recovery stress occurs if the SMA is restrained. In this paper, a panel subject to the combined aerodynamic and thermal loading is investigated. A nonlinear finite element model based on von Karman strain displacement relation is utilized to study the effectiveness of an SMA embedded panel on the flutter boundary, critical buckling temperature and post-buckling deflection. The study is performed on an isotropic panel, with embedded SMA. The aerodynamic model is based on the first order quasi-steady piston theory. The aerodynamic pressure effect on the buckling and post-buckling behavior of the panel is investigated by introducing the aerodynamic stiffness term, which changes both the critical buckling temperature and the post-buckling shape. Panels with SMA embedded in either x or y-direction and either partially or fully embedded are investigated for post-buckling behavior. Similarly, the influence of the temperature elevation on the flutter boundary is investigated by including the thermal terms.
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Mohammad Tawfik, Bin Duan, Jeng-Jong Ro, and Chuh Mei "Suppression of postbuckling deflection and panel flutter using shape memory alloy", Proc. SPIE 3991, Smart Structures and Materials 2000: Industrial and Commercial Applications of Smart Structures Technologies, (12 June 2000);

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