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Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes

Bosi, F; Pellegrino, S; (2018) Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes. Mechanics of Materials , 117 pp. 9-21. 10.1016/j.mechmat.2017.10.004. Green open access

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Abstract

Thin films of linear low-density polyethylene show a significant time-dependent behavior, strongly reliant on temperature and strain rate effects. A constitutive nonlinear thermo-viscoelastic relation is developed to characterize the response of thin membranes up to yielding, in a wide range of temperatures, strain rates, and mechanical loading conditions. The presented plane stress orthotropic formulation involves the free volume theory of viscoelasticity and the time-temperature superposition principle, necessary to describe non-linearities and non-isothermal conditions. Uniaxial tension tests at constant strain rate and long-duration biaxial inflation experiments have been employed in the calibration of the material parameters. The model has been implemented in the Abaqus finite element code by means of a user-defined subroutine based on a recursive integration algorithm. The accuracy of the constitutive relation has been validated against experimental data of full field diaphragm inflation tests and uniaxial tension, relaxation and cyclic experiments, covering sub-ambient temperatures and strain rate ranges observed during the operation of stratospheric balloons.

Type: Article
Title: Nonlinear thermomechanical response and constitutive modeling of viscoelastic polyethylene membranes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.mechmat.2017.10.004
Publisher version: http://dx.doi.org/10.1016/j.mechmat.2017.10.004
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: http://discovery.ucl.ac.uk/id/eprint/10046496
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