Shear characterisation of uni-directional fibre reinforced thermoplastic melts by means of torsion

Sebastiaan Haanappel, Remko Akkerman

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

Intra-ply shear appears during the forming process of hot thermoplastic laminates with a uni-directional fibre reinforcement. This paper proposes a torsion bar test to characterise the longitudinal shear mechanism, which can be performed with a standard rheometer. Sensitivity analyses showed that most reliable shear property measurements can be obtained by using torsion bar specimens with a close to square cross section. The method is implemented in practise and critically evaluated. Storage and loss moduli were determined for carbon UD/PEEK specimens at high temperatures. Non-linear material behaviour was found for relatively small shear strains. The linear regime was focussed on subsequently, where the characteristics were found to be similar to that of a visco-elastic solid or weak gel, confirmed by a dominant storage modulus and a weak frequency dependency. Future work is recommended to be focussed on the large strain regime, for which this paper provides a found basis
Original languageEnglish
Pages (from-to)8-26
JournalComposites Part A: Applied Science and Manufacturing
Volume56
DOIs
Publication statusPublished - 2014

Keywords

  • IR-89259
  • METIS-302166

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