The correlation of indentation size effect experiments with pyramidal and spherical indenters

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

Research output: Contribution to journalArticlepeer-review


Experiments were conducted in annealed iridium using pyramidal and spherical indenters over a wide range of load. For a Berkovich pyramidal indenter, the hardness increased with decreasing depth of penetration. However, for spherical indenters, hardness increased with decreasing sphere radius. Based on the number of geometrically necessary dislocations generated during indentation, a theory that takes into account the work hardening differences between pyramidal and spherical indenters is developed to correlate the indentation size effects measured with the two indenters. The experimental results verify the theoretical correlation.
Original languageEnglish
Pages (from-to)451-456
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Publication statusPublished - 2001

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Los Alamos National Laboratory, an affirmative action/equal opportunity employer, is operated by the University of California for the U.S. Department of
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  • annealed iridium
  • pyramidal indenters
  • spherical indenters
  • Iridium alloys
  • Indentation
  • Indentation size effect


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