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Proceedings Paper

Thermomechanical indentation of shape memory polymers
Author(s): H. Jerry Qi; Martin L. Dunn; Kevin Long; Francisco Castro; Robin Shandas
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Paper Abstract

Shape memory polymers (SMPs) are receiving increasing attention because of their ability to store a temporary shape for a prescribed period of time, and then when subjected to an environmental stimulus, recover an original programmed shape. They are attractive candidates for a wide range of applications in microsystems, biomedical devices, deployable aerospace structures, and morphing structures. In this paper we investigate the thermomechanical behavior of shape memory polymers due to instrumented indentation, a loading/deformation scenario that represents complex multiaxial deformation. The SMP sample is indented using a spherical indenter at a temperature T1 (>Tg). The temperature is then lowered to T2 (g) while the indenter is kept in place. After removal of the indenter at T2, an indentation impression exists. Shape memory is then activated by increasing the temperature to T1 (>Tg); during free recovery the indentation impression disappears and the surface of the SMP recovers to its original profile. A recently-developed three-dimensional finite deformation constitutive model for the thermomechanical behavior of SMPs is then used with the finite element method to simulate this process. Measurement and simulation results are compared for cases of free and constrained recovery and good agreement is obtained, suggesting the appropriateness of the simulation approach for complex multiaxial loading/deformations that are likely to occur in applications.

Paper Details

Date Published: 17 April 2007
PDF: 10 pages
Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 652615 (17 April 2007); doi: 10.1117/12.717022
Show Author Affiliations
H. Jerry Qi, Univ. of Colorado, Boulder (United States)
Martin L. Dunn, Univ. of Colorado, Boulder (United States)
Kevin Long, Univ. of Colorado, Boulder (United States)
Francisco Castro, Univ. of Colorado, Boulder (United States)
Robin Shandas, Univ. of Colorado, Boulder (United States)

Published in SPIE Proceedings Vol. 6526:
Behavior and Mechanics of Multifunctional and Composite Materials 2007
Marcelo J. Dapino, Editor(s)

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