Finite-element simulation of a new two-dissipative mechanisms model for bulk medium-density polyethylene

A two-dissipative mechanisms model, associating a Maxwell and an elastoplastic model in parallel, is discussed in order to account for the non-linear viscoelasticity of bulk medium-density polyethylene. On the one-hand, the experimental determination of the constitutive equations coefficients is des...

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Bibliographic Details
Published in:Journal of materials science 1996-03, Vol.31 (6), p.1653-1661
Main Authors: KICHENIN, J, DANG VAN, K, BOYTARD, K
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Rheology and viscoelasticity
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Summary:A two-dissipative mechanisms model, associating a Maxwell and an elastoplastic model in parallel, is discussed in order to account for the non-linear viscoelasticity of bulk medium-density polyethylene. On the one-hand, the experimental determination of the constitutive equations coefficients is described from a tensile specimen machined from gas pipes. On the other hand, finite-element simulation of the stress relaxation experiment, proposed by Sweeney and Ward, (ibid, 1990, 25, p. 697) is achieved, which yields a complete analysis of the dissipative mechanisms interaction during the test. The finite-element code built upon this modelling is finally used in a tentative simulation of a cyclic pressure test on a pipe specimen.
ISSN:0022-2461
1573-4803
DOI:10.1007/bf00357878