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| The hardness of a material can be measured by pushing an indenter into the material under a defined load. The diagram shows two indenters used for Rockwell hardness measurements. The diamond cone is used for the hardest materials, and hardness numbers on the A, C, and D scales are obtained by applying the indicated loads and measuring the indentation depth. The steel ball is used for softer materials, with a 1/16 inch ball being used for the B, F, and G scales, and the 1/8 inch ball for the E scale. These tests are non-destructive and the hardness numbers obtained may be correlated with material elastic and plastic properties. | ||||||||
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