Rate dependent deformation of semi-crystalline polypropylene near room temperature

E. M. Arruda, Said Ahzi, Y. Li, A. Ganesan

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We examine the strain rate dependent, large plastic deformation in isotropic semi-crystalline polypropylene at room temperature. Constant strain rate uniaxial compression tests on cylindrical polypropylene specimens show very little true strain softening under quasi-static conditions. At high strain rates very large amounts (38 percent) of apparent strain softening accompanied by temperature rises are recorded. We examine the capability of a recently proposed constitutive model of plastic deformation in semi-crystalline polymers to predict this behavior. We neglect the contribution of the amorphous phase to the plastic deformation response and include the effects of adiabatic heating at high strain rates. Attention is focused on the ability to predict rate dependent yielding, strain softening, strain hardening, and adiabatic temperature rises with this approach. Comparison of simulations and experimental results show good agreement and provide insight into the merits of using a polycrystalline modeling assumption versus incorporating the amorphous contribution. Discrepancies between experiments and model predictions are explained in terms of expectations associated with neglecting the amorphous deformation.

Original languageEnglish
Pages (from-to)216-222
Number of pages7
JournalJournal of Engineering Materials and Technology, Transactions of the ASME
Volume119
Issue number3
Publication statusPublished - Jul 1997
Externally publishedYes

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Polypropylenes
polypropylene
plastic deformation
Strain rate
Crystalline materials
Plastic deformation
strain rate
room temperature
Temperature
Constitutive models
Strain hardening
Polymers
compression tests
strain hardening
Heating
heating
temperature
Experiments
polymers
predictions

ASJC Scopus subject areas

  • Mechanical Engineering
  • Materials Science(all)

Cite this

Rate dependent deformation of semi-crystalline polypropylene near room temperature. / Arruda, E. M.; Ahzi, Said; Li, Y.; Ganesan, A.

In: Journal of Engineering Materials and Technology, Transactions of the ASME, Vol. 119, No. 3, 07.1997, p. 216-222.

Research output: Contribution to journalArticle

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