Compressive Creep of Virgin HDPE Using Equivalent Strain Energy Density Method
Publication: Journal of Materials in Civil Engineering
Volume 22, Issue 12
Abstract
This paper presents a predictive model for compressive creep behavior of high-density polyethylene (HDPE) commonly used to manufacture polymeric piling and geosynthetics. Accelerated methods to predict the tensile creep of polymers are already available. In this paper, a method to predict the compressive creep of viscoelastic polymers is proposed based on the equivalence of strain energy density (SED) between conventional constant-stress creep tests and strain-controlled stress-strain (ramp loading at different constant strain rates) tests. There is good agreement between the creep behaviors obtained from conventional tests and SED predictions when two stress-strain experiments with strain rates differing by two or more orders of magnitude are used. SED was also used as a basis for predicting the onset of tertiary creep. Finally, onset of tertiary creep was used for rational selection of the ultimate strength of viscoelastic materials, whose strength is inversely proportional to duration of loading.
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Information
Published In
Journal of Materials in Civil Engineering
Volume 22 • Issue 12 • December 2010
Pages: 1270 - 1281
Copyright
© 2010 ASCE.
History
Received: Jun 26, 2008
Accepted: May 12, 2010
Published online: Jun 12, 2010
Published in print: Dec 2010
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