Creep failure of polypropylene: Experiments and constitutive modeling

Aleksey D. Drozdov, J. de C. Christiansen

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


Observations are reported on isotactic polypropylene in uniaxial tensile tests with various strain rates, relaxation tests with various strains, and creep tests with various stresses at ambient temperature. Constitutive equations are derived for the viscoelastic-viscoplastic responses and damage of a semicrystalline polymer at three-dimensional deformations. Adjustable parameters in the stress-strain relations are found by fitting the experimental data. The model is applied to predict creep-failure diagrams in the entire interval of stresses. A phenomenological approach is proposed to determine a knee stress, at which transition occurs from ductile to brittle rupture. Accuracy of this method is evaluated by numerical simulation.

Original languageEnglish
Pages (from-to)63-79
Number of pages17
JournalInternational Journal of Fracture
Issue number1
StatePublished - 27 Aug 2009
Externally publishedYes


  • Creep failure
  • Damage
  • Polypropylene
  • Viscoelasticity
  • Viscoplasticity

ASJC Scopus subject areas

  • Computational Mechanics
  • Modeling and Simulation
  • Mechanics of Materials


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