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Hardness Testing Equipment
Engineering Metals and Materials Table of Contents
In this test, a small pyramidal diamond is pressed into the
metal being tested. The Vickers Hardness number (HV) is the ratio of the load
applied to the surface area of the indention. This is done with the following
formula.
The indenter is made of diamond, and is in the form of a
square-based pyramid having an angle of 136 degrees between faces. The facets
are highly-polished, free from surface imperfections, and the point is sharp.
The loads applied vary from 1 to 120 kg; the standard loads are 5, 10, 20, 30,
50, 100, and 120 kg. For most hardness testing, 50 kg is maximum.
A Vickers hardness tester should be calibrated to meet ASTM
standard E10 specifications, acceptable for use over a loading range.
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