Time dependent thermo-mechanical behavior of thermally induced shape memory polymers

Francisco Castro; H. Jerry Qi; Jason M. Hermiller; Ernie Havens

doi:10.1117/12.817609

31 March 2009 Time dependent thermo-mechanical behavior of thermally induced shape memory polymers

Francisco Castro, H. Jerry Qi, Jason M. Hermiller, Ernie Havens

Proceedings Volume 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009; 72900K (2009) https://doi.org/10.1117/12.817609
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2009, San Diego, California, United States

Abstract

Shape memory polymers (SMPs) are polymers that can recover a large pre-deformed shape in response to environmental stimuli, such as temperatures, light, etc. For a thermally induced amorphous shape memory polymer, the pre-deformation and recovery of the shape require the material to traverse the glassy transition temperature T_g under constrained or free conditions. In this paper, effects of thermal rates to mechanical behaviors of SMP under constrained condition were investigated. The stress-temperature behavior demonstrates a faster stress decrease than thermal contraction during cooling and a characteristic stress overshoot during constrained reheating. These observations were explained by a one dimensional (1D) model that considers the non-equilibrium structure relaxation and viscoelastic behavior of the material.

Citation Download Citation

Francisco Castro, H. Jerry Qi, Jason M. Hermiller, and Ernie Havens "Time dependent thermo-mechanical behavior of thermally induced shape memory polymers", Proc. SPIE 7290, Industrial and Commercial Applications of Smart Structures Technologies 2009, 72900K (31 March 2009); https://doi.org/10.1117/12.817609

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