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Estimation of hardness by nanoindentation of rough surfaces

Bobji, MS and Biswas, SK (1998) Estimation of hardness by nanoindentation of rough surfaces. In: Journal of Materials Research, 13 (11). pp. 3227-3233.


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The roughness of a surface influences the surface mechanical properties, estimated using nanoindentation data. Assuming a relation between the penetration depth normalized with respect to a roughness scale parameter, and the effective radius encountered by the indenter, a first order model of roughness dependency of hardness is proposed. The practical usefulness of this model is verified by the numerical simulation of nanoindentation on a fractal surface. As the roughness of a surface is increased, the hardness measured at depths comparable with the roughness scale deviates increasingly from the actual hardness. Given the constants related to indenter geometry, the present work provides a rationale and a method for deconvoluting the effect of roughness in arriving at real hardness characteristics of the near surface region of a material.

Item Type: Journal Article
Publication: Journal of Materials Research
Publisher: Materials Research Society
Additional Information: Copyright for this article belongs to Materials Research Society.
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Date Deposited: 07 Sep 2004
Last Modified: 19 Sep 2010 04:15
URI: http://eprints.iisc.ac.in/id/eprint/1395

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