This paper considers the comparison and evaluation of Superficial-Rockwell (HRT) hardness tests using the steel and
tungsten carbide ball indenters. There are differences observed in Superficial-Rockwell HRT hardness scale tests by
using 1.588 mm (1/16") diameter steel and tungsten carbide ball indenters. The modeling was made with HRT hardness
reference blocks and widespread soft thinner gage material (copper, aluminum, steel) with different thickness. In the
simulation determined that the tungsten carbide indenter balls have the advantage of being less likely to flatten with
repeated use and the use of hard metal ball indenters may have different measurement results than tests using steel ball
indenters. The simulation of indentation process is performed by the finite element method in the Academic version of
ANSYS software product, which is available for free use on the website The simulation results are confirmed by
experimental studies. For further analysis of the results of comparisons it is interesting to conduct researches for micro-
Vickers and Berkovich hardness scales. Furthermore, the practical application of the obtained results allows to evaluate
the quality abradable surfaces in the design of structural components with small clearances. The obtained results are
important for evaluation of the results of international comparisons of the national standards. This work was performed
as part of preparation the Draft A COOMET.M.H-S3 - Supplementary comparison of regional metrological organization
for Superficial-Rockwell Hardness scales.
A plastic deformation of the metal significantly changes its internal structure and greatly influences many mechanical,
physical and chemical properties. In the plastic deformation process increases the electrical resistance, changes the
magnetic properties and decreases the thermal conductivity and the workability of the metal. But this influence is
especially evident in the measurement of the hardness of the deformable body, which is connected directly to an increase
in the yield strength of the material, i.e. the hardening. Hardness measurements were made on samples of whole over the
entire length. After the experimental study by rupturing samples were carried out repeated measurements of hardness
over the entire length. Modeling the process of rupturing samples was carried out by finite element method (FEM) in
Academical version of ANSYS. The phenomenological link between the calculated and experimental values of hardness
and stress state of the sample were determined. The obtained results are important for evaluation of the results of
international comparisons of the national standards of hardness. As the perspective directions for the practical application
of the results proposed evaluation and prediction of hardness standard measures the hardness of the first rank in their
manufacture. The predictions of the FEM models were compared with experimental data, and the accuracy of these
predictions was quite satisfactory.
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