Characterization and modeling of polymeric matrix under multi-axial static and dynamic loading

B. T. Werner, I. M. Daniel*

*Corresponding author for this work

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

A polymeric matrix (3501-6) used in composite materials was characterized under multi-axial loading at strain rates varying from quasi-static to dynamic. Tests were conducted under uniaxial compression, tension, pure shear and combinations of normal and shear stresses. Quasi-static and intermediate strain rate tests were conducted in a servo-hydraulic testing machine. High strain rate tests were conducted using a split Hopkinson pressure bar (Kolsky bar) system made of glass/epoxy composite bars having an impedance compatible to that of the test polymer. The typical stress-strain behavior of the polymeric matrix exhibits a linear elastic region up to a yield point, a nonlinear elastic-plastic region up to an initial peak or "critical stress," followed by strain softening up to a local minimum, plateau or saddle point stress, and finally, a strain hardening region up to ultimate failure. A general three-dimensional elastic-viscoplastic model, formulated in strain space, was developed. The model expresses the multi-axial state of stress in terms of an effective stress, incorporates strain rate effects and includes the large deformation region. Stress-strain curves obtained under multi-axial loading at different strain rates were used to develop and validate the new elastic-viscoplastic constitutive model. Excellent agreement was shown between model predictions and experimental results.

Original languageEnglish (US)
Pages (from-to)113-119
Number of pages7
JournalComposites Science and Technology
Volume102
DOIs
StatePublished - Oct 6 2014

Keywords

  • A. Polymers
  • B. Nonlinear behavior
  • C. Modeling
  • D. Dynamic mechanical thermal analysis (DMTA)
  • E. Casting

ASJC Scopus subject areas

  • Ceramics and Composites
  • Engineering(all)

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