Comparison of conventional Knoop and Vickers hardness of ceramic materials

Ceramics generally have a lower Knoop than Vickers hardness. This difference is due to the elastic recovery occurring around a Knoop indentation and the difference in representative area considered to calculate the hardness value. Conventional hardness tests with Knoop and Vickers indenters were per...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2017-06, Vol.37 (6), p.2531-2535
Main Authors: Ben Ghorbal, Ghailen, Tricoteaux, Arnaud, Thuault, Anthony, Louis, Ghislain, Chicot, Didier
Format: Article
Language:English
Subjects:
Ceramics
Engineering Sciences
Indentation
Knoop
Mechanical properties
Vickers
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ceramics generally have a lower Knoop than Vickers hardness. This difference is due to the elastic recovery occurring around a Knoop indentation and the difference in representative area considered to calculate the hardness value. Conventional hardness tests with Knoop and Vickers indenters were performed in order to show how Knoop hardness test can give the same hardness number obtained by Vickers hardness test. This is obtained when Knoop hardness number is calculated based on the residual plastically deformed area whether projected or true. Complementary hardness data obtained from the literature were used in this work in order to validate the method proposed in this work. A revision of the well-known relation of Marshall is proposed in order to determine the elastic modulus by means of one Knoop hardness test when the Vickers hardness is unknown.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2017.02.014