Abstract
When nanoindentation is used for thin film characterization, usually shallow indents are made to avoid the spurious effect of the substrate. However, surface effects stemming from surface roughness and friction can become important in shallow indentation depths, potentially resulting in the variation of nanoindentation results. A numerical study is conducted aiming for a more complete understanding of the coupled influence of friction and sample surface roughness in nanoindentation of pure nickel, using a slip rate dependent friction law. Two experimentally used post-treatment methods are applied to obtain the elastic properties from the raw numerical data. Results confirm the strong interaction between these two contributions of surface effects, and their cumulative effect leads to significant variations in both the indenter load vs. displacement curves and the evaluated elastic modulus. The resulting dispersion is somewhat higher than the one computed for a slip rate independent Coulomb friction. The velocity-weakening nature of the used friction law, is observed to induce a stick-slip behavior which has a manifestation similar to pop-ins in the load-displacement curves.
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Berke, P., Massart, T.J. (2011). Coupled Friction and Roughness Surface Effects in Shallow Spherical Nanoindentation. In: Zavarise, G., Wriggers, P. (eds) Trends in Computational Contact Mechanics. Lecture Notes in Applied and Computational Mechanics, vol 58. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-22167-5_15
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DOI: https://doi.org/10.1007/978-3-642-22167-5_15
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