A multiscale multisurface constitutive model for the thermo-plastic behavior of polyethylene

N. Vu-Bac, P. M A Areias, Timon Rabczuk

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

We present a multiscale model bridging length and time scales from molecular to continuum levels with the objective of predicting the yield behavior of amorphous glassy polyethylene (PE). Constitutive parameters are obtained from molecular dynamics (MD) simulations, decreasing the requirement for ad-hoc experiments. Consequently, we achieve: (1) the identification of multisurface yield functions; (2) the high strain rate involved in MD simulations is upscaled to continuum via quasi-static simulations. Validation demonstrates that the entire multisurface yield functions can be scaled to quasi-static rates where the yield stresses are possibly predicted by a proposed scaling law; (3) a hierarchical multiscale model is constructed to predict temperature and strain rate dependent yield strength of the PE.

Original languageEnglish
Pages (from-to)327-338
Number of pages12
JournalPolymer (United Kingdom)
Volume105
DOIs
Publication statusPublished - 2016 Nov 22
Externally publishedYes

Keywords

  • Multiscale modeling
  • Multisurface yield functions
  • Polyethylene (PE)
  • Viscoplastic

ASJC Scopus subject areas

  • Polymers and Plastics
  • Organic Chemistry

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