Comparison of Five Methods Used to Measure Hardness (Classic Reprint) - Softcover

Inhaltsangabe

Excerpt from Comparison of Five Methods Used to Measure Hardness

Since Brinell proposed this method it has been investigated by Le Chatelier,2 Leon,3 Malmstrom,4 Meyers,5 and others.

The cone test, which is a modification of the sphere test, was first proposed and investigated by Ludwik. The principle of the method is the same as that of the sphere except that a cone of 90 angular opening is substituted for the sphere.

For the measurement of the workability or cutting hardness of metals Bauer proposed a method which depends in principle on the depth of hole drilled in a given time by a drill running at a con stand speed and under a constant pressure.

In 1906 Shore originated a hardness-measuring instrument, the action of which depends on the rebound of a hardened steel ham mer when it is dropped upon the substance under investigation.

The Ballantine method depends upon the amount a leaden disk is indented when it transmits through an anvil the energy of a falling hammer to the metal to be tested.

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