Stress-strain relations of a viscoelastic composite reinforced with elliptic cylinders

J. Li, G. J. Weng

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The stress-strain behaviors of a two-phase composite comprising a viscoelastic matrix and elastic elliptic cylinders are examined by means of a micromechanical theory. The reinforcing cylinders are taken to be aligned along direction 1 but randomly oriented in the 2-3 plane, with a common aspect ratio α (the thickness-to-width ratio). The strain-rate sensitivity of the stress-strain curves of the transversely isotropic composite is investigated as a function of the cross-sectional aspect ratio of the elliptic cylinders, and it is found that when the aspect ratio is one - corresponding to the traditional aligned fibers - the reinforcement is the poorest and that when the aspect ratio approaches zero - corresponding to long, thin ribbons - it is the most effective. Other types of cross-sectional aspect ratios all give rise to a stress-strain curve lying between these two. Except for the thin ribbon with α - 0 and axial tension for all, other types of reinforcement all exhibit a saturation stress under a constant strain rate and result in strong strain-rate sensitivity for the overall response of the system.

Original languageEnglish (US)
Pages (from-to)19-30
Number of pages12
JournalJournal of Thermoplastic Composite Materials
Issue number1
StatePublished - Jan 1997

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Condensed Matter Physics


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