A model for elastic hysteresis of unidirectional fibrous nano composites incorporating stick-slip

M. M.S. Dwaikat, C. Spitas, V. Spitas

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

In fibrous nano-composites, slip of fillers within the matrix comprises a major mechanism through which energy is dissipated. In the current study, a simplified model for predicting the elastic hysteresis of perfectly aligned unidirectional nano-composites loaded in the direction of the fibers is developed. The model, based on shear lag analysis and derived from basic principles of continuum micromechanics, incorporates a shear stick-slip constitutive law at the matrix-fiber interface. Once calibrated by comparison to cyclic stress-strain curves on nano-composites, the model is used to conduct a set of parametric studies on the influence of various parameters on the energy dissipation. Simulation results reveal that the interfacial shear stick-slip constitutive law, the volume fraction andthe aspect ratio of the fibers, and the fiber-to-matrix stiffness ratio have a direct influence on the hysteresis of nano-composites. Also, it is demonstrated that it is possible to achieve an optimal set of parameters for which energy dissipation due to hysteresis is maximized. The proposed model provides a numerically efficient yet reasonably accurate alternative for use in design and analysis of fibrous composites when compared to existing complex models.

Original languageEnglish
Pages (from-to)349-356
Number of pages8
JournalMaterials Science and Engineering A
Volume530
Issue number1
DOIs
Publication statusPublished - Dec 15 2011
Externally publishedYes

Keywords

  • Carbon nanotubes
  • Elastic hysteresis
  • Energy dissipation
  • Nano-composites
  • Shear lag
  • Stick-slip

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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