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6 April 2009 Large deformation modeling of swelling actuation in conjugated polymer systems
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Conjugated polymer actuators provide delicate solutions in biomimetic robotics and bio/micromanipulation. For these applications, it is highly desirable to have large deformation. Because linear elasticity theory is only valid when the strain is small, this poses significant challenges in the electromechanical modeling. In this paper, we use a nonlinear strain energy function to capture the stored elastic energy under actuation-induced swelling, which further allows us to compute the induced stress. Numerical method is used to obtain the deformation variables by solving the force and bending moment balance equations simultaneously. Experimental results for a trilayer conjugated polymer beam can be predicted by the proposed model better than the linear model. This proposed framework can also be applied to the analysis of large deformations of other electroactive polymers.
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Yang Fang, Thomas J. Pence, and Xiaobo Tan "Large deformation modeling of swelling actuation in conjugated polymer systems", Proc. SPIE 7287, Electroactive Polymer Actuators and Devices (EAPAD) 2009, 72871O (6 April 2009);

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