论文期刊

Numerical study on the electromechanical behavior of dielectric elastomer with the influence of surrounding medium




作者: Kun Jia,Tongqing Lu
发表/完成日期: 2016-03-24
期刊名称: International Journal of Smart and Nano Materials,
期卷:
相关文章:
论文简介
The considerable electric-induced shape change, together with
the attributes of lightweight, high efficiency, and inexpensive
cost, makes dielectric elastomer, a promising soft active material
for the realization of actuators in broad applications. Although, a
number of prototype devices have been demonstrated in the past
few years, the further development of this technology necessitates
adequate analytical and numerical tools. Especially, previous theoretical
studies always neglect the influence of surrounding medium.
Due to the large deformation and nonlinear equations of
states involved in dielectric elastomer, finite element method
(FEM) is anticipated; however, the few available formulations
employ homemade codes, which are inconvenient to implement.
The aim of this work is to present a numerical approach with the
commercial FEM package COMSOL to investigate the nonlinear
response of dielectric elastomer under electric stimulation. The
influence of surrounding free space on the electric field is analyzed
and the corresponding electric force is taken into account through
an electric surface traction on the circumstances edge. By employing
Maxwell stress tensor as actuation pressure, the mechanical
and electric governing equations for dielectric elastomer are
coupled, and then solved simultaneously with the Gent model of
stain energy to derive the electric induced large deformation as
well as the electromechanical instability. The finite element implementation
presented here may provide a powerful computational
tool to help design and optimize the engineering applications of
dielectric elastomer.
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