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 journalArticle

8 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

Fingerprint

Stick-slip
Hysteresis
slip
hysteresis
composite materials
Composite materials
Fibers
shear
fibers
Energy dissipation
energy dissipation
fiber-matrix interfaces
stiffness matrix
micromechanics
Micromechanics
Stiffness matrix
Stress-strain curves
fillers
Fillers
aspect ratio

Keywords

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

ASJC Scopus subject areas

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

Cite this

A model for elastic hysteresis of unidirectional fibrous nano composites incorporating stick-slip. / Dwaikat, M. M S; Spitas, C.; Spitas, V.

In: Materials Science and Engineering A, Vol. 530, No. 1, 15.12.2011, p. 349-356.

Research output: Contribution to journalArticle

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