Fluid-structure Interactions Of Fast
Photomechanical Liquid Crystal Elastomers
Driven By Light
Author(s)
J. Bin, W. S. Oates & M. Y. Hussaini
Abstract
A new class of photomechanical liquid crystal elastomers (LCE) has emerged,
which generate large bending deformation and fast response times that scale with
the resonance of the elastomer films. These films are classified as glassy
elastomers (modulus ~1GPa) and are doped with photoresponsive azobenzene
liquid crystals to provide novel light induced deformation. These materials are
promising for developing propulsions systems for insect size aircraft and
microfluidic devices, for example. The photomechanical efficiency of these
materials in a fluid medium is of high interest to understand the performance
attributes of this class of smart materials. Here, a numerical study is presented
that describes the photomechanical structural dynamic behaviour in a fluid
medium. We simulate the oscillation of photomechanical cantilevers excited by
light while simultaneously modeling the effect of the surrounding fluid at
different ambient pressures. The photoelastomer structure is modeled as a thin
plate and coupled with photomechanical constitutive relations to compute the
transverse displacement. For the fluid, three dimensional unsteady
incompressible Navier-Stokes equations using the arbitrary Lagrangian Eulerian
(ALE) form are used to consider dynamic mesh movement on a local mesh and
boundary conditions on the elastomer material interface. The fluid equations are
discretized using a conventional finite volume method (FVM) on a structured
curvilinear coordinate system. Numerical examples are given which provide new
insight into photomechanical material efficiencies in a fluid medium as a
function of ambient pressure.
Keywords: liquid crystal elastomer, azobenzene LCN, arbitrary Lagrangian-
Eulerian, artificial compressibility, fluid-structure interaction.
Keywords
liquid crystal elastomer, azobenzene LCN, arbitrary Lagrangian-
Eulerian, artificial compressibility, fluid-structure interaction
Related Book
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