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

POLYMER

卷:128

Article

Cho, Hansohl¹  Mayer, Steffen²  Poeselt, Elmar²  Susoff, Markus²  in't Veld, Pieter J.³  Rutledge, Gregory C.¹  Boyce, Mary C.⁴ 

[1] MIT, Dept Chem Engn, Cambridge, MA 02139 USA

[2] BASF Polyurethanes GmbH, Lemforde, Germany

[3] ROM AM, BASF SE, Ludwigshafen, Germany

[4] Columbia Univ, Fu Fdn Sch Engn & Appl Sci, New York, NY 10027 USA

关键词: Thermoplastic polyurethane;    Large strain behavior;    Hyperelastic-viscoplasticity;   

DOI  :  10.1016/j.polymer.2017.08.065

来源: Elsevier

【 摘 要 】

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. (C) 2017 Elsevier Ltd. All rights reserved.

【 授权许可】

Free