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Deformation mechanisms of thermoplastic elastomers: Stress-strain behavior and constitutive modeling

Author(s)
Cho, Hansohl; Mayer, Steffen; Pöselt, Elmar; Susoff, Markus; in 't Veld, Pieter J.; Rutledge, Gregory C; Boyce, Mary C.; ... Show more Show less
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Abstract
This work addresses the large strain behaviors of thermoplastic polyurethanes (TPUs) spanning a range of fractions of hard and soft contents in both experiment and theoretical modeling. The key mechanical features involve a combination of elasticity and inelasticity, and are quantified experimentally under a broad variety of loading scenarios. A finite deformation constitutive model is then presented to capture the main features of the stress-strain data, which are strongly dependent on fractions of hard and soft contents. The stress-strain behavior of these TPUs is characterized by highly nonlinear rate-dependent hyperelastic-viscoplasticity, in which substantial energy dissipation is accompanied by shape recovery as well as softening. Agreement between the model and the experimental data for the representative TPUs provides physical insight into the underlying deformation mechanisms in this important class of soft materials that exhibit both elastomeric and plastomeric characteristics.
Date issued
2017-10
URI
https://hdl.handle.net/1721.1/125802
Department
Massachusetts Institute of Technology. Department of Chemical Engineering
Journal
Polymer
Publisher
Elsevier BV
Citation
Cho, Hansohl et al. "Deformation mechanisms of thermoplastic elastomers: Stress-strain behavior and constitutive modeling." Polymer 128 (October 2017): 87-99 © 2017 Elsevier Ltd
Version: Author's final manuscript
ISSN
0032-3861

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