The effect of nanostructure upon the compressive strength of carbon fibres

Fumihiko Tanaka, Tomonaga Okabe, Haruki Okuda, Ian A. Kinloch, Robert J. Young

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

The relationship between the structure and the compressive strength of carbon fibres has been studied in detail. In order to determine the compressive strength, a combination of single-fibre composite tests and Raman spectroscopy was employed. It was found that the compressive stress-strain curves showed nonlinear behaviour, with modulus softening in compression. The compressive strengths for the fibres with a modulus ≥400 GPa were measured as ≤2 GPa and those with a modulus <400 GPa were >2 GPa. We have introduced a model to explain this behaviour that assumes that the fibres behave as composites consisting of both crystallites and amorphous carbon. It is suggested that the compressive strength is controlled by the critical stress for kinking the crystallites in the fibres. Hence, the compressive strength of carbon fibres is found to depend upon the shear modulus of the fibres and the orientation of the crystallites within them.

Original languageEnglish
Pages (from-to)2104-2110
Number of pages7
JournalJournal of Materials Science
Volume48
Issue number5
DOIs
Publication statusPublished - 2013 Mar 1

ASJC Scopus subject areas

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

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