Question

In Rockwell hardness testing method, the hardness of a material is measured by-

• A. Depth of penetration of indenter
• B. Surface area of indention
• C. Projected area of indention
• D. Height of rebound

Answer 1

Answer:

A. Depth of penetration of indenter

Rockwell hardness testing method measures the hardness of a material by the depth of penetration of the indenter. A variety of indenters and loads are used in this method to develop different scales for different materials. Brinell hardness test uses a hard spherical indenter with a diameter of 10 mm and load varying between 500-3000 kg. Hardness is the measure of localized plastic deformation and is related to the size of the resulting indentation.