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Viscoelastic response of closed-cell polyurethane foams from half hour-long creep tests: identification of Lomnitz behavior

[+] Author and Article Information
Christian Pichler

Assistant Professor, Material Technology Innsbruck, University of Innsbruck, A-6020 Innsbruck, Austria
christian.pichler@uibk.ac.at

Marcus Maier

Graduate Research Assistant, Material Technology Innsbruck, University of Innsbruck, A-6020 Innsbruck, Austria
marcus.maier@uibk.ac.at

Roman Lackner

Professor, Material Technology Innsbruck, University of Innsbruck, A-6020 Innsbruck, Austria
roman.lackner@uibk.ac.at

1Corresponding author.

ASME doi:10.1115/1.4040831 History: Received May 02, 2018; Revised July 02, 2018

Abstract

In this paper a protocol for interpretation of static creep tests on closed-cell polyurethane foams is defined, considering the influence of a finite loading duration when identifying creep compliance parameters. Experiments were conducted at isothermal conditions with temperatures ranging from 20 to 120 degrees Celcius. The experimental results indicate Lomnitz, i.e. logarithmic-type creep behavior. We discuss uniqueness of the backcalculated parameters. Furthermore, the viscoelastic material parameters obtained were verified in independent experiments: elastic compliance by ultrasonic wave velocity measurements, viscous material parameters by relaxation tests.

Copyright (c) 2018 by ASME
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