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Thermoviscoelastic models for polyethylene thin films

Li, Jun and Kwok, Kawai and Pellegrino, Sergio (2016) Thermoviscoelastic models for polyethylene thin films. Mechanics of Time-Dependent Materials, 20 (1). pp. 13-43. ISSN 1385-2000.

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This paper presents a constitutive thermoviscoelastic model for thin films of linear low-density polyethylene subject to strains up to yielding. The model is based on the free volume theory of nonlinear thermoviscoelasticity, extended to orthotropic membranes. An ingredient of the present approach is that the experimentally inaccessible out-of-plane material properties are determined by fitting the model predictions to the measured nonlinear behavior of the film. Creep tests, uniaxial tension tests, and biaxial bubble tests are used to determine the material parameters. The model has been validated experimentally, against data obtained from uniaxial tension tests and biaxial cylindrical tests at a wide range of temperatures and strain rates spanning two orders of magnitude.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Kwok, Kawai0000-0001-6876-4267
Pellegrino, Sergio0000-0001-9373-3278
Additional Information:© 2015 Springer Science+Business Media Dordrecht. Received: 24 March 2015; Accepted: 15 September 2015; First online: 02 November 2015. We thank Drs. Wolfgang Knauss (California Institute of Technology), James Rand (Winzen Engineering), and David Wakefield (Tensys Limited) for helpful comments and discussions. We thank Dr. He of NASA GSFC for providing DMA test data on StratoFilm, Dr. W.N. Warner of NASA Jet Propulsion Laboratory for assistance in measuring the out-of-plane CTE of StratoFilm, and Dr. L. Young of NASA Wallops for providing test data. This research was supported by the NASA Balloon Program Office. Financial support from the Croucher Foundation (Hong Kong) for Kawai Kwok is also gratefully acknowledged.
Funding AgencyGrant Number
Croucher FoundationUNSPECIFIED
Subject Keywords:Nonlinear viscoelasticity; Free volume model; Polymer thin film
Issue or Number:1
Record Number:CaltechAUTHORS:20151116-102001293
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:62119
Deposited By: Tony Diaz
Deposited On:17 Nov 2015 23:59
Last Modified:03 Oct 2019 09:15

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