Cyclic viscoelastoplasticity of polypropylene/nanoclay hybrids

A. D. Drozdov, J. Dec Christiansen

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Observations are reported on isotactic polypropylene/organically modified nanoclay hybrids in tensile cyclic tests at room temperature (ratcheting between fixed maximum and minimum stresses). A pronounced effect of nanofiller is demonstrated: reinforcement of polypropylene with 1 wt.% of clay results in reduction of maximum and minimum strains per cycle by several times and growth of number of cycles to failure by an order of magnitude. To rationalize these findings, a constitutive model is developed in cyclic viscoelastoplasticity of polymer nanocomposites. Adjustable parameters in the stress-strain relations are found by fitting experimental data in relaxation tests and cyclic tests (16 cycles of loading-unloading). It is demonstrated that the model correctly predicts growth of maximum and minimum strains per cycle with number of cycles and can be applied to predict fatigue failure of nanocomposites.

Original languageEnglish
Pages (from-to)396-408
Number of pages13
JournalComputational Materials Science
Issue number1
StatePublished - 1 Feb 2012
Externally publishedYes


  • Constitutive modeling
  • Polymer nanocomposite
  • Ratcheting
  • Viscoelasticity
  • Viscoplasticity

ASJC Scopus subject areas

  • Computer Science (all)
  • Chemistry (all)
  • Materials Science (all)
  • Mechanics of Materials
  • Physics and Astronomy (all)
  • Computational Mathematics


Dive into the research topics of 'Cyclic viscoelastoplasticity of polypropylene/nanoclay hybrids'. Together they form a unique fingerprint.

Cite this