Nonlinear structural mechanics and dynamics of azobenzene polymer network film

Liang Cheng; Yanira Torres; William S. Oates

doi:10.1117/12.880432

27 April 2011 Nonlinear structural mechanics and dynamics of azobenzene polymer network film

Liang Cheng, Yanira Torres, William S. Oates

Proceedings Volume 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011; 79780C (2011) https://doi.org/10.1117/12.880432
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2011, San Diego, California, United States

Abstract

Azobenzene liquid crystal polymer networks have recently drawn significant attention due to their novel photomechanical material behavior for developing remotely actuated adaptive structures. The photoisomerization of this material leads to large polymer network deformation since the liquid crystals are synthesized within the network. The amount of deformation may also be changed by applying polarized light and rotating the polarization relative to the liquid crystal orientation. A nonlinear photomechanical shell model is developed to understand polarized light induced bending deformation and structural dynamics of these photomechanical films. The large deformation finite element shell model within the Finite Element Analysis Program (FEAP) is extended to accommodate nonlinear liquid crystal photomechanics and structural dynamics. Nonlinear light-induced bending strain is incorporated into the model as a function of angle dependent light reflection and absorption and nonlinear liquid crystal absorption. The results illustrate changes in light induced bending deformation with respect to the incident angle of light with the material surface for moderate to large bending angles. A set of material parameters are identified to compare the static and structural dynamic model predictions with measurements given in the literature.

Citation Download Citation

Liang Cheng, Yanira Torres, and William S. Oates "Nonlinear structural mechanics and dynamics of azobenzene polymer network film", Proc. SPIE 7978, Behavior and Mechanics of Multifunctional Materials and Composites 2011, 79780C (27 April 2011); https://doi.org/10.1117/12.880432

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