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The Relation of the Vickers Hardness With the Loading Stiffness of Instrumented Vickers Indentation of Metal Substrates

[+] Author and Article Information
E. A. Baxevani

Department of Civil Engineering, Laboratory of Strength of Materials and Micromechanics, University of Thessaly, Pedion Areos, 38334 Volos, Greeceebaxevani@uth.gr

A. E. Giannakopoulos

Department of Civil Engineering, Laboratory of Strength of Materials and Micromechanics, University of Thessaly, Pedion Areos, 38334 Volos, Greeceagiannak@uth.gr

Finite element calculations (18) predict that for the vickers indentation $5(HV/Er)≈We/Wt$ Combined with Eq. 9 this leads to $We/Wt≈2bρ0,08$, indicating that metals with high Burger’s vector would tend to give shallow residual indentation imprint (increasing $We/Wt$).

J. Eng. Mater. Technol 132(3), 034501 (Jun 15, 2010) (5 pages) doi:10.1115/1.4001300 History: Received April 14, 2009; Revised February 17, 2010; Published June 15, 2010; Online June 15, 2010

Abstract

The present paper presents a relation between the vickers hardness HV and the loading stiffness C of instrumented vickers indentation of metal substrates. The relation is based on the fact that the nonaxisymmetry of the plastic deformation of the vickers indenter leaves the corners of the indentation imprint at the surface of metal substrates after complete unloading. This relation can transform available HV data for metals to C data. It is also shown that the strain hardening details are important in the estimation of material properties and investigators should be cautions when using power-law strain hardening in all cases.

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Figures

Figure 1

Schematic presentation of imprint from hardness test using vickers pyramid indenter

Figure 2

Diagram of penetration force versus indentation depth using pyramid indenter

Figure 3

Correlation of the indentation stiffness C=P/h2 values as predicted from Eq. 6, CHV, and Eq. 8, Ccalc, respectively

Figure 4

Stored energy of cold work (a) indentation induced and (b) uniaxial tension

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