Effect of temperature on the viscoelastic and viscoplastic behavior of polypropylene |
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Authors: | A D Drozdov |
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Affiliation: | 1.Danish Technological Institute,Taastrup,Denmark |
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Abstract: | Observations are reported on isotactic polypropylene in tensile tests with various cross-head speeds and relaxation tests
in a wide interval of temperatures ranging from room temperature to 120°C. A constitutive model is derived for the viscoelastic
and viscoplastic responses of a semicrystalline polymer at arbitrary deformations with small strains. The stress–strain relations
involve 6 adjustable parameters that are found by fitting the experimental data. The presence of a critical temperature is
demonstrated at which some parameters of the model reach their maxima. This temperature is associated with the α-relaxation temperature of polypropylene. |
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