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Viscoelastic material characterization and modeling for polyethylene
Author(s) -
Popelar C. F.,
Popelar C. H.,
Kenner V. H.
Publication year - 1990
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760301004
Subject(s) - viscoelasticity , materials science , stress relaxation , piping , polyethylene , composite material , high density polyethylene , relaxation (psychology) , stress (linguistics) , creep , modulus , strain rate , constant (computer programming) , characterization (materials science) , nonlinear system , mechanics , thermodynamics , nanotechnology , psychology , social psychology , quantum mechanics , linguistics , physics , philosophy , computer science , programming language
An extensive set of stress relaxation and constant strain rate tests for characterizing the mechanical responses of a medium density polyethylene and a high density polyethylene that are commonly used in natural gas distribution piping is described and analyzed. The development of coherent master curves for the relaxation modulus, maximum stress, and the time‐to‐failure for pressurized pipes through a combination of both horizontal and vertical shifting is presented. The relaxation data are used to develop a nonlinear Viscoelastic material model. The model is assessed by making comparisons of the predicted stress‐strain response with the measured response in the constant strain rate tests.