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Monday, July 8 • 16:30 - 16:50
SPONTANEOUS BENDING AND VIBRATION OF LIQUID CRYSTAL ELASTOMER FILMS

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Liquid crystal elastomers (LCEs) are weakly crosslinked polymers with liquid crystal (LC) moiety. They combine the finite deformability of elastomers with the multi-functionality of LCs. Rather large spontaneous deformations can be produced by thermal, optical and electrical stimuli. They can be used as active soft materials in many applications. However, their mechanical behavior depends strongly on the physical properties of the LC molecules attached to the polymer backbones. We propose a continuum mechanical model that combines the finite elasticity theory with the liquid crystal dynamics. In addition to the mechanical equations, we obtain the governing equations for the LC alignment: the director and the order parameter. The stress-strain relation of LCEs is affected strongly by these internal variables. Thin films of LCEs can bend and vibrate under optical or electrical stimuli due to spontaneous deformations. However, the bending behavior can be quite different from purely elastic materials as the LC alignment can have strong effects on the transversal shear strains. A first order shear strain theory is proposed to model the spontaneous bending and vibration. Through proper design of the LC alignment, we can regulate and control the spontaneous bending and vibration behaviors.

Moderators
avatar for Simon Jones

Simon Jones

Associate Professor, Rose-Hulman Institute of Technology
Professional interests include undergraduate engineering education, finite element modeling, ground-borne vibrations, vibrations of musical instruments, and dynamics of toys.
GM

Guilhem Michon

Professor, ISAE-SUPAERO

Authors

Monday July 8, 2019 16:30 - 16:50 EDT
St-Laurent 7
  T07 Struct. dyn. & nonlin. vib., RS03 Struct ac & vibr

Attendees (1)