Effect of Geometry, Loading and Elastic Moduli on Critical Parameters in a Nanoindentation Test in Polymeric Matrix Composites with a Nonhomogeneous Interphase

Sri Harsha Garapati, Autar Kaw

Research output: Contribution to journalArticlepeer-review

Abstract

Fiber nanoindentation models are developed for polymeric matrix composites with nonhomogeneous interphases. Using design of experiments, the effects of geometry, loading and material parameters on the critical parameters of the indentation test such as the load-displacement curve, the maximum interfacial shear and normal stresses are studied. The sensitivity analysis shows that the initial load-displacement curve is dependent only on the indenter type, and not on parameters such as fiber volume fraction, interphase type, thickness of interphase, and boundary conditions. The interfacial tensile radial stresses are not sensitive to indenter type, or to type and thickness of interphase, while the interfacial compressive radial stresses are sensitive mainly to boundary conditions and thickness of interphase; however, the influence of these factors on the interfacial radial stresses can be large. In contrast, the interfacial shear stress is sensitive to all factors, but the influence of the factors is relatively small.

Original languageAmerican English
JournalComposite Interfaces
Volume18
DOIs
StatePublished - Jan 1 2011

Keywords

  • design of experiments
  • finite element analysis (fea)
  • interface/interphase
  • mechanical properties
  • nonhomogeneous interphase
  • statistical properties/methods

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