2012 U.S. Professor of the Year
Professor, OCW advocate, socioeconomic diversity champion, onepony pedagogy assailant, UDL believer, replicating educationresearch studies supporter.


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Effect of geometry, loading, and elastic moduli on critical parameters in a nanoindentation test in polymeric matrix composites with a nonhomogeneous interphase 
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 loaddisplacement curve, and the maximum interfacial shear and normal stresses are studied. The sensitivity analysis shows that the initial loaddisplacement 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. 