The correlation of the indentation size effect measured with indenters of various shapes

J.G. Swadener, E.P. George, G.M. Pharr

Research output: Contribution to journalArticle

Abstract

Experimental results are presented which show that the indentation size effect for pyramidal and spherical indenters can be correlated. For a pyramidal indenter, the hardness measured in crystalline materials usually increases with decreasing depth of penetration, which is known as the indentation size effect. Spherical indentation also shows an indentation size effect. However, for a spherical indenter, hardness is not affected by depth, but increases with decreasing sphere radius. The correlation for pyramidal and spherical indenter shapes is based on geometrically necessary dislocations and work-hardening. The Nix and Gao indentation size effect model (J. Mech. Phys. Solids 46 (1998) 411) for conical indenters is extended to indenters of various shapes and compared to the experimental results.
Original languageEnglish
Pages (from-to)681-694
Number of pages14
JournalJournal of the Mechanics and Physics of Solids
Volume50
Issue number4
Early online date11 Mar 2002
DOIs
Publication statusPublished - Apr 2002

Keywords

  • dislocations
  • strengthening and mechanisms
  • mechanical testing
  • indentation and hardness

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