Unidirectional carbon fibre reinforced polyamide-12 composites with enhanced strain to tensile failure by introducing fibre waviness

Hele Diao, Paul Robinson, Michael R. Wisnom, Alexander Bismarck

Research output: Contribution to journalArticle (Academic Journal)peer-review

17 Citations (Scopus)
305 Downloads (Pure)

Abstract

Abstract Unidirectional (UD) carbon fibre reinforced polymers offer high specific strength and stiffness but they fail in a catastrophic manner with little warning. Gas-texturing and non-constrained annealing were used to introduce fibre waviness into UD polyamide 12 composites produced by wet-impregnation hoping to produce composites with a more gradual failure mode and increased failure strain. Both methods increased the variation of fibre alignment angle compared to the control samples. The composites containing wavy fibres exhibited a stepwise, gradual failure mode under strain controlled uniaxial tension rather than a catastrophic failure, observed in control samples. Gas-texturing damaged the fibres resulting in a decrease of the tensile strength and strain to failure, which resulted in composites with lower tensile strength and ultimate failure strain than the control composites. Non-constrained annealing of carbon fibre/PA-12 produced wavy fibre composites with ultimate failure strain of 2%, significantly higher than 1.6% of the control composite.
Original languageEnglish
Pages (from-to)186-193
Number of pages23
JournalComposites Part A: Applied Science and Manufacturing
Volume87
Early online date25 Apr 2016
DOIs
Publication statusPublished - Aug 2016

Keywords

  • A. Polymer-matrix composites (PMCs)
  • A. Carbon fibre
  • B. Mechanical properties

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