Thermally actuated shape-memory polymers: Experiments, theory, and numerical simulations
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Author(s)
Srivastava, Vikas
Chester, Shawn Alexander
Anand, Lallit
Date Issued
April 2010
Journal
Journal of the Mechanics and Physics of Solids
Publisher
Elsevier
Citation
Srivastava, Vikas, Shawn A. Chester, and Lallit Anand. “Thermally Actuated Shape-memory Polymers: Experiments, Theory, and Numerical Simulations.” Journal of the Mechanics and Physics of Solids 58.8 (2010) : 1100-1124. Web.
Version
Author's final manuscript
Abstract
With the aim of developing a thermo-mechanically-coupled large-deformation constitutive theory and a
numerical-simulation capability for modeling the response of thermally-actuated shape-memory polymers,
we have (i) conducted large strain compression experiments on a representative shape-memory polymer
to strains of approximately unity at strain rates of 10[superscript −3] s[superscript −1] and 10[superscript −1] s[superscript −1], and at temperatures ranging
from room temperature to approximately 30C above the glass transition temperature of the polymer; (ii)
formulated a thermo-mechanically-coupled large-deformation constitutive theory; (iii) calibrated the material
parameters appearing in the theory using the stress-strain data from the compression experiments; (iv)
numerically implemented the theory by writing a user-material subroutine for a widely-used finite element
program; and (v) conducted representative experiments to validate the predictive capability of our theory
and its numerical implementation in complex three-dimensional geometries. By comparing the numericallypredicted
response in these validation simulations against measurements from corresponding experiments,
we show that our theory is capable of reasonably accurately reproducing the experimental results. As a
demonstration of the robustness of the three-dimensional numerical capability, we also show results from a
simulation of the shape-recovery response of a stent made from the polymer when it is inserted in an artery
modeled as a compliant elastomeric tube.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
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DOI of Published Version
https://doi.org/10.1016/j.jmps.2010.04.004
