Question

The Rockwell test for hardness employs _____________as an indenter.

• A. steel pyramid
• B. diamond cone
• C. diamond pyramid
• D. steel ball

Answer 1

Answer:

B. diamond cone

The Rockwell hardness test uses a diamond conical indenter that can be applied to all types of materials. The test measures the depth of penetration to determine hardness. The formula for Rockwell hardness number is inversely proportional to the depth of penetration $RHN \propto \frac{1}{D_p}$ Brinell hardness Test-$BHN=\frac{2P}{\pi D[D-\sqrt{D^2-d^2}]}$