Effect of single-fiber properties and fiber volume fraction on the mechanical properties of Ioncell fiber composites

Alp Karakoc*, Mindaugas Bulota, Michael Hummel, Simona Sriubaitė, Mark Hughes, Herbert Sixta, Jouni Paltakari

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

The present study concentrates on a series of experiments and numerical analyses for understanding the effects of fiber volume fraction (VF) and draw ratio (DR) on the effective elastic properties of unidirectional composites made from an epoxy resin matrix with a continuous fiber reinforcement. Lyocell-type regenerated cellulose filaments (Ioncell) spun with DRs of 3, 6, and 9 were used. In accordance with the specimens in situ, the fibers were modeled as slender solid elements, for which the ratio between the diameter and length was taken to be much less than unity and deposited inside the matrix with the random sequential adsorption algorithm. The embedded element method was thereafter used in the numerical framework due to its computational advantages and reasonable predictions for continuous fiber reinforced composites. Experiments and numerical investigations were carried out, the results of which were compared, and positive trends for both fiber VFs and DRs on the effective properties were observed. The presented experimental and numerical results and models herein are believed to advance the state of the art in the mechanical characterization of composites with continuous fiber reinforcement.

Original languageEnglish
Pages (from-to)741-748
Number of pages8
JournalJOURNAL OF REINFORCED PLASTICS AND COMPOSITES
Volume40
Issue number19-20
Early online date26 Mar 2021
DOIs
Publication statusE-pub ahead of print - 26 Mar 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Composites
  • draw ratio
  • embedded element method
  • fiber volume fraction
  • Ioncell
  • regenerated cellulose fiber

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