Fiber association and network formation in PLA/lignocellulosic fiber composites

G. Faludi, J. Hári, K. Renner, J. Móczó, B. Pukánszky

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

PLA composites were prepared in an internal mixer with a lignocellulosic fiber having relatively large aspect ratio. Fiber content changed between 0 and 60. vol.% and the homogenized material was compression molded to 1. mm thick plates. The composites showed anomalous behavior above certain fiber content. Their modulus and especially their strength decreased drastically and modeling also proved the loss of reinforcement at large fiber contents. Micromechanical testing showed that the mechanism of deformation and failure changes at a critical fiber content. Microscopic analysis indicated the formation of a network purely from geometrical reasons. The inherent strength of the network is very small because of the weak forces acting among the fibers. This weak inherent strength makes the structure of the composites very sensitive to processing conditions, and decreases strength, reproducibility as well as reliability.

Original languageEnglish
Pages (from-to)67-73
Number of pages7
JournalComposites Science and Technology
Volume77
DOIs
Publication statusPublished - Mar 2 2013

Keywords

  • A. Short-fiber composites
  • B. Mechanical properties
  • C. Damage mechanism
  • C. Failure criterion
  • Network formation

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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