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Measurement and Prediction of the Thermomechanical Response of Shape Memory Alloy Hybrid Composite Beams

Department of Mechanical and Aerospace Engineering, North Carolina State University Raleigh, NC 27695-7910, USA, badavis4{at}ncsu.edu

Travis L. Turner

NASA Langley Research Center, Structural Acoustics Branch Hampton, VA 23681-2199, USA

Stefan Seelecke

Department of Mechanical and Aerospace Engineering, North Carolina State University Raleigh, NC 27695-7910, USA

An experimental and numerical investigation into the static and dynamic responses of shape memory alloy hybrid composite (SMAHC) beams is performed to provide quantitative validation of a recently commercialized numerical analysis/design tool for SMAHC structures. The SMAHC beam specimens consist of a composite matrix with embedded pre-strained SMA actuators, which act against the mechanical boundaries of the structure when thermally activated to adaptively stiffen the structure. Numerical results are produced from the numerical model as implemented into the commercial finite element code ABAQUS. A rigorous experimental investigation is undertaken to acquire high fidelity measurements including infrared thermography and projection moiré interferometry for full-field temperature and displacement measurements, respectively. High fidelity numerical results are also obtained from the numerical model and include measured parameters, such as geometric imperfection and thermal load. Excellent agreement is achieved between the predicted and measured results of the static and dynamic thermomechanical response, thereby providing quantitative validation of the numerical tool.

Key Words: shape memory alloys • Nitinol • embedded actuators • hybrid composites • nonlinear thermoelasticity • thermal buckling • thermal post-buckling • random response.

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