Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 56, Issue 5, Pages 1730-1751Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2007.12.002
Keywords
shape memory polymers; constitutive modeling; finite deformation behavior; stress-strain behavior; thermo-mechanical behavior
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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 T-H > T-g. It will maintain this deformed shape after subsequently lowering the temperature to T-L < T-g and removing the externally mechanical load. The shape memory effect is activated by increasing the temperature to T-D > T-g, 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. (C) 2007 Elsevier Ltd. All rights reserved.
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