Constitutive equations for the viscoplastic response of isotactic polypropylene in cyclic tests: The effect of strain rate

A. D. Drozdov, J. De C. Christiansen

Research output: Contribution to journalArticlepeer-review

18 Scopus citations

Abstract

A series of uniaxial tensile loading-unloading tests are performed on injection-molded isotactic polypropylene at room temperature. In each test, a specimen is stretched up to the maximal strain ε max = 0.12 with a constant strain rate, ε, and retracted down to the zero stress with the same strain rate. The cross-head speeds vary from 5 to 200 mm/min, which covers practically the entire range of strain rates used in conventional quasi-static tests. A constitutive model is developed for the viscoplastic response of a semicrystalline polymer at small strains. The stress-strain relations are determined by five adjustable parameters that are found by matching the observations. Fair agreement is demonstrated between the experimental data results of numerical simulation

Original languageEnglish
Pages (from-to)548-556
Number of pages9
JournalPolymer Engineering and Science
Volume44
Issue number3
DOIs
StatePublished - 1 Mar 2004
Externally publishedYes

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