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In this study, we propose a bearing ratio model for nanoindentation of rough surfaces. During an indentation test, the work done by an applied indentation load contains the bulk work and the surface work. The surface work causes plastic deformation of an indented rough surface and thus dissipates energy, which is necessary to form an impression on a solid. The energy dissipation occurring at the indented...
Nanoindentation experiments on Al/glass systems show that, as the indentation depth increases, the hardness decreases during a shallow indentation, and increases when the indenter tip approaches the film-substrate interface. We associate the rise in hardness during two stages with the strong strain gradient effects, the first stage is related with the small scale effects and the second stage with...
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