Effects of the loading direction on high strain rate behavior of woven graphite/epoxy composites

Fatih Turan, Mohammad R. Allazadeh, Sylvanus N. Wosu

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Abstract

Effects of the loading direction on high strain rate behavior of cylindrical woven graphite/epoxy composites are presented. Compressive split Hopkinson pressure bar (SHPB) was used for high strain rate experiments. Cylindrical specimens were loaded diametrically and transversely at the impact energies of 67 J, 163 J, and 263 J. Micro Laser Raman spectroscopy and scanning electron microscopy (SEM) were used for surface characterization. It is observed that diametrically loaded specimens show permanent plastic deformation with high ductility resulting in a catastrophic failure while transversely loaded specimens exhibit viscoplastic deformation with some recoverable damage. As a result of this, Raman peak shifted to higher values for the diametrically loaded fibers whereas almost no change was observed in the Raman shift of transversely loaded fibers.
Original languageEnglish
Pages (from-to)69-86
Number of pages18
JournalJournal of Materials Science Research
Volume1
Issue number2
DOIs
Publication statusPublished - 30 Apr 2012

Keywords

  • high strain rate
  • P-SHPB
  • raman spectrum
  • impact load
  • woven graphite epoxy composite
  • logitudinal loading
  • diametrical loading

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