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Proceedings Paper

An optical microform calibration system for ball-shaped hardness indenters
Author(s): Zhi Li; Sai Gao; Konrad Herrmann
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Paper Abstract

Accurate measurement of the mechanical properties of materials with micro-/nanoindentation methods demands precise knowledge of tip geometry of the indenters in use. An optical microform calibration system for ball-shaped indenters, and Rockwell indenter in particular, is therefore developed in Physikalisch-Technische Bundesanstalt. The calibration system is fundamentally realized on basis of an optical confocal microscope. By means of investigating the spherical aberration introduced by the object under test, the calibration system has the capability to quantitatively determine the averaging radius of a spherical body (up to 300 μm) with an uncertainty of ~ 6 x 10-3. To apply the calibration system for characterization of a partial spherical object, e.g. a Rockwell indenter, a simple method has been proposed to improve the possible resolution of the calibration system. The basic configuration of the calibration system and preliminary experimental results are detailed in this paper. Further extension of the functionality of the calibration system is outlined.

Paper Details

Date Published: 14 May 2010
PDF: 8 pages
Proc. SPIE 7718, Optical Micro- and Nanometrology III, 77181C (14 May 2010); doi: 10.1117/12.854800
Show Author Affiliations
Zhi Li, Physikalisch-Technische Bundesanstalt (Germany)
Sai Gao, Physikalisch-Technische Bundesanstalt (Germany)
Konrad Herrmann, Physikalisch-Technische Bundesanstalt (Germany)

Published in SPIE Proceedings Vol. 7718:
Optical Micro- and Nanometrology III
Christophe Gorecki; Anand Krishna Asundi; Wolfgang Osten, Editor(s)

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