The effect of recycling on the time-dependent behavior of polycarbonate reinforced with short glass fibers

A. D. Drozdov, A. Al-Mulla, R. K. Gupta

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


Observations are reported on virgin, recycled and a mixture of virgin and recycled polycarbonates reinforced with various amounts of short glass fibers (1) in tensile tests with a constant strain rate and (2) in oscillatory torsion tests at room temperature. A constitutive model is developed for the viscoelastic and viscoplastic behavior of a polymer composite with a glassy matrix. The composite is treated as an equivalent ensemble of meso-regions linked with each other. With reference to the theory of cooperative relaxation, the viscoelastic response is attributed of rearrangement of meso-domains. The viscoplastic behavior reflects sliding of meso-regions with respect to each other. The rate of sliding is proportional to the rate of macro-deformation. Constitutive equations for isothermal three-dimensional deformation with small strains are derived by using the laws of thermodynamics. The stress-strain relations are determined by five adjustable parameters that are found by fitting the experimental data. The study concentrates on the effects of filler content and recycling of the host matrix on the mechanical properties of composites.

Original languageEnglish
Pages (from-to)129-144
Number of pages16
JournalComposites Science and Technology
Issue number1
StatePublished - 1 Jan 2004
Externally publishedYes


  • A: Polymer-matrix composites (PMCs)
  • A: Short-fiber composites
  • B: Mechanical properties
  • C: Anelasticity
  • C: Complex moduli

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering (all)


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