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Fiber nanoindentation models
are developed for polym eric 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, and 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, type and thickness of interphase, while the
interfacial compressive radial stresses are sensitive mainly
to boundary conditions and thickness of interphase; though,
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.
Related Papers
S. Garapati, A. Kaw, "Effect
of Geometry, Loading and Elastic Moduli on Critical
Parameters in a Nanoindentation Test in Polymeric Matrix
Composites with a Nonhomogeneous Interphase", Composite
Interfaces, Vol. 18, pp. 275–294,
2011.
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