Statistical analysis of the Vickers hardness

Citation
Jm. Schneider et al., Statistical analysis of the Vickers hardness, MAT SCI E A, 262(1-2), 1999, pp. 256-263
Citations number
8
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
262
Issue
1-2
Year of publication
1999
Pages
256 - 263
Database
ISI
SICI code
0921-5093(19990401)262:1-2<256:SAOTVH>2.0.ZU;2-C
Abstract
The statistical dispersion in Vickers hardness measurements is discussed in order to check the reliability of hardness measurements. Several indentati ons were made under the same nominal conditions on a hardness standard. Thi s was repeated for different loads. The distribution of diagonal lengths of : indentation prints is found to be of Gaussian type. From the distribution function of the indentation lengths, the probability density function of t he hardness is derived For the general case of several indentation measurem ents. The mean value and variance of hardness are compared with results bas ed on Gaussian statistics. From this comparison. it follows that statistica l analysis relying upon Gaussian distributions can be carried out within a given confidence level which depends on the number of indentations. A metho d is presented to calculate the number of indentations needed to achieve a certain level of accuracy. (C) 1999 Elsevier Science S.A. All rights reserv ed.