Factors determining the performance of thermoplastic polymer/wood composites; the limiting role of fiber fracture

Gábor Faludi, Zoltán Link, Károly Renner, J. Móczó, B. Pukánszky

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Thermoplastic polymer/lignocellulosic fiber composites were prepared with a considerable range of matrices and fibers in an internal mixer. Tensile properties were determined on bars cut from compression molded plates. Local deformation processes initiated around the fibers were followed by acoustic emission testing supported by electron and polarization optical microscopy. The analysis of results proved that micromechanical deformation processes initiated by the fibers determine the performance of the composites. Debonding usually leads to the decrease of composite strength, but decreasing strength is not always associated with poor adhesion and debonding. The direction of property change with increasing wood content depends on component properties and interfacial adhesion. Good interfacial adhesion often results in the fracture of the fibers. Depending on their size and aspect ratio, fibers may fracture parallel or perpendicular to their axis. At good adhesion, the maximum strength achieved for a particular polymer/wood pair depends on the inherent strength of the fibers, which is larger for perpendicular than parallel fracture. Inherent fiber strength effective in a composite depends also on particle size, larger particles fail at smaller stress, because of the larger number of possible flaws in them. A very close correlation exists between the initiation stress of the dominating local deformation process and composite strength proving that these processes lead to the failure of the composite and determine its performance.

Original languageEnglish
Pages (from-to)203-210
Number of pages8
JournalMaterials and Design
Volume61
DOIs
Publication statusPublished - 2014

Fingerprint

Thermoplastics
Wood
Polymers
Fibers
Composite materials
Adhesion
Debonding
Acoustic emission testing
Tensile properties
Optical microscopy
Aspect ratio
Compaction
Particle size
Polarization
Defects
Electrons

Keywords

  • Acoustic emission testing
  • Biocomposites
  • Fiber fracture
  • Inherent strength of wood particles
  • Interfacial adhesion
  • Micromechanical deformations

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Factors determining the performance of thermoplastic polymer/wood composites; the limiting role of fiber fracture. / Faludi, Gábor; Link, Zoltán; Renner, Károly; Móczó, J.; Pukánszky, B.

In: Materials and Design, Vol. 61, 2014, p. 203-210.

Research output: Contribution to journalArticle

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