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Indentation size effect in metallic materials: Correcting for the size of the plastic zone

2005; Elsevier BV; Volume: 52; Issue: 11 Linguagem: Inglês

10.1016/j.scriptamat.2005.02.009

1872-8456

Karsten Durst, Björn Backes, Mathias Göken,

Advanced materials and composites

A correction method is proposed for the Nix/Gao model of the indentation size effect, assuming that the geometrically necessary dislocations are stored within the plastically deformed volume, whose radius is given, depending on the material, by a factor times the contact radius. Using this volume for calculating the depth dependence of hardness and the characteristic indentation length scale h* a good agreement with experiments is found for many metallic materials.