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Limits of linear viscoelastic behavior of polymers

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Abstract

In the present study different approaches for determination of the limits of linear viscoelastic (LVE) behavior are considered on examples of some thermoplastic and thermosetting polymers. Stress or strain level, commonly considered as a limit of LVE behavior, are interrelated time-dependent functions strongly influenced by action of external factors. The concept of energy threshold has an advantage of combining into one physical function the effects of both stress and strain in initiating nonlinear behavior. The value of the stored deviatoric energy is considered as a limit of LVE behavior and is a material characteristic. The experimental data on tension at various constant strain rates and tensile creep at various stresses, temperatures, and moisture conditions are considered. It is proved for some polymers that LVE limits in stress-strain representation fall on a common curve that is an energy curve independent of time. Decrease of the test rate or growth of temperature or moisture content appears only in a shift down along the energy curve to the lower limit stresses and higher limit strains.

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Abbreviations

LVE::

linear viscoelasticity

Ep::

epoxy resin

PA6::

polyamide 6

PC::

polycarbonate

Pe::

polyester resin

PEEK::

polyether-ether-ketone

PoM::

polyoxymethylene

Ve::

vinylester resin

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Authors and Affiliations

  1. Institute of Polymer Mechanics, University of Latvia, 23 Aizkraukles Str., Riga, 1006, Latvia

    O. Starkova & A. Aniskevich

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  1. O. Starkova
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  2. A. Aniskevich
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Correspondence to O. Starkova.

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Starkova, O., Aniskevich, A. Limits of linear viscoelastic behavior of polymers. Mech Time-Depend Mater 11, 111–126 (2007). https://doi.org/10.1007/s11043-007-9036-3

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  • DOI: https://doi.org/10.1007/s11043-007-9036-3

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