Thermal post-buckling andaeroelastic behaviour of shape memory alloy reinforced plates

Mohammad Tawfik; Jeng-Jong Ro; ChuhMei

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Thermal post-buckling andaeroelastic behaviour of shape memory alloy reinforced plates

机译：Thermal post-buckling andaeroelastic behaviour of shape memory alloy reinforced plates

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A novel concept is proposed: the use of shape memoryalloy (SMA) to reduce panel thermal deflection and flutterresponses. SMA has a unique ability to recover largepre-strains completely when the alloy is heated above theaustenite finish temperatureAf. The transformation austenite start temperatureAsfor nitinol can be anywherebetween -60°F (-50°C) and+340°F (+170°C) by varying the nickel content. During the recovery process, a large tensile recoverystress occurs if the SMA is restrained. The shape memory effectphenomenon is attributed to a change in crystal structure known asa reversible austenite to martensite phase transformation. Thissolid-solid phase transformation also gives a large increasein Young's modulus and yield stress.In this paper, a panel subject to the combined aerodynamic andthermal loading is investigated. A nonlinear finite elementmodel based on the von Karman strain-displacement relation isutilized to study the effectiveness of an SMA-embedded panel onthe flutter boundary, critical buckling temperature,post-buckling deflection and free vibration. The study isperformed on an isotropic panel with embedded SMA. Theaerodynamic model is based on the first-order quasi-steadypiston theory. The dynamic pressure effect on the buckling andpost-buckling behaviour of the panel is investigated byintroducing the aerodynamic stiffness term, which changes thecritical buckling temperature. Panels with SMA embedded ineither the longer or shorter direction and either fully orpartially embedded are investigated for post-buckling behaviour.Similarly, the influence of temperature elevation on theflutter boundary and vibration frequencies is investiga

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《smart materials and structures》 |2002年第2期|297-307|共页
作者
Mohammad Tawfik; Jeng-Jong Ro; ChuhMei;
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Mechanical Engineering Department, Universityof Maryland, College Park, 20742, USA;

Mechanical Engineering Department, Dayeh University,Changhwa, 51505, Taiwan, Republic of China;

Aerospace Engineering Department, Old DominionUniversity, Norfolk, VA 23529, USA;

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Thermal post-buckling andaeroelastic behaviour of shape memory alloy reinforced plates

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