Thermomechanical indentation of shape memory polymers

H. Jerry Qi; Martin L. Dunn; Kevin Long; Francisco Castro; Robin Shandas

doi:10.1117/12.717022

17 April 2007 Thermomechanical indentation of shape memory polymers

H. Jerry Qi, Martin L. Dunn, Kevin Long, Francisco Castro, Robin Shandas

Proceedings Volume 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007; 652615 (2007) https://doi.org/10.1117/12.717022
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

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 (>T_g). 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 (>T_g); 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.

Citation Download Citation

H. Jerry Qi, Martin L. Dunn, Kevin Long, Francisco Castro, and Robin Shandas "Thermomechanical indentation of shape memory polymers", Proc. SPIE 6526, Behavior and Mechanics of Multifunctional and Composite Materials 2007, 652615 (17 April 2007); https://doi.org/10.1117/12.717022

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