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The Correlation between Hardness and Yield Strength of Hard Materials

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Abstract:

The correlation between hardness, H, and yield strength, Y, for hard materials is reexamined using an analytical approach to provide a physical interpretation, which explains the trends observed. Existing analytical predictions using the analogy of the spherical cavity fail to reproduce experimental and finite element results because the accommodation of the intrusion of the indenter due to surface deformation is not taken into account, while experiments made here and elsewhere indicate that the latter can be substantial. A simple modification is proposed, which accounts for this, and allows for a reasonable prediction of the relation between hardness and yield strength for materials, which have a well determined yield point and do not strain harden. The treatment also allows explaining the effect of indenter geometry on measured hardness for such materials.

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Periodical:

Materials Science Forum (Volumes 492-493)

Pages:

555-560

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.492-493.555

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Online since:

August 2005

Authors:

L. Vandeperre, W.J. Clegg

Keywords:

Hardness, Nanoindentation, Yield Strength

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© 2005 Trans Tech Publications Ltd. All Rights Reserved

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