Thermoforming process of semicrystalline polymeric sheets: Modeling and finite element simulations

Ahmed Makradi, Said Ahzi, S. Belouettar, D. Ruch

Research output: Contribution to journalArticle

4 Citations (Scopus)


A micromechanically-based elastic-viscoplastic model for the thermoforming process of semicrystalline polymer materials is proposed and implemented in a finite element code. This model takes into account the temperature and strain rate dependence. In this process the applied temperature is taken uniform throughout the sheet and its variation is due only to the adiabatic heating. The simulations are conducted for isotactic polypropylene using the finite element method. The polymer sheet thickness, the orientation of the polymer molecular chains, and the percent crystallinity show an important dependence on the process temperature (polymer softening) and the geometry of the mold. Based on recent experimental results in the literature, amorphization (decrease of crystallinity) is taken into account.

Original languageEnglish
Pages (from-to)550-557
Number of pages8
JournalPolymer Science - Series A
Issue number5
Publication statusPublished - May 2008
Externally publishedYes


ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics

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