Finite deformation thermo-mechanical behavior of thermally induced shape memory polymers |
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Authors: | H Jerry Qi Thao D Nguyen Christopher M Yakacki |
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Institution: | a Department of Mechanical Engineering, University of Colorado, 427 UCB, ECME 124, Boulder, CO 80309, USA b Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD 21218, USA |
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Abstract: | Shape memory polymers (SMPs) are polymers that can demonstrate programmable shape memory effects. Typically, an SMP is pre-deformed from an initial shape to a deformed shape by applying a mechanical load at the temperature TH>Tg. It will maintain this deformed shape after subsequently lowering the temperature to TL<Tg and removing the externally mechanical load. The shape memory effect is activated by increasing the temperature to TD>Tg, where the initial shape is recovered. In this paper, the finite deformation thermo-mechanical behaviors of amorphous SMPs are experimentally investigated. Based on the experimental observations and an understanding of the underlying physical mechanism of the shape memory behavior, a three-dimensional (3D) constitutive model is developed to describe the finite deformation thermo-mechanical response of SMPs. The model in this paper has been implemented into an ABAQUS user material subroutine (UMAT) for finite element analysis, and numerical simulations of the thermo-mechanical experiments verify the efficiency of the model. This model will serve as a modeling tool for the design of more complicated SMP-based structures and devices. |
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Keywords: | Shape memory polymers Constitutive modeling Finite deformation behavior Stress-strain behavior Thermo-mechanical behavior |
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