The nonlinear viscoelastic behavior of polypropylene

    Research output: Other contributionNet publication - Internet publicationResearch

    Abstract

    A series of tensile relaxation tests is performed on isotactic polypropylene in the
    sub-yield and post-yield regions at room temperature. Constitutive equations are
    derived for the time-dependent response of a semicrystalline polymer at isothermal
    loading with small strains. Adjustable parameters in the stress–strain relations
    are found by fitting experimental data. It is demonstrated that the growth of the
    longitudinal strain results in an increase in the relaxation rate in a small interval of
    strains in the sub-yield domain. When the strain exceeds some critical value which
    is substantially less than the apparent yield strain, the relaxation process becomes
    strain-independent.
    Original languageEnglish
    Publication date2002
    Number of pages20
    Publication statusPublished - 2002

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