How is hardness useful?
How is hardness useful? Hardness is the property of a material that enables it to resist plastic deformation, penetration, indentation, and scratching. Therefore, hardness is important from an engineering standpoint because resistance to wear by either friction or erosion by steam, oil, and water generally increases with hardness. What is true hardness? Hardness can be defined as resistance to penetration. In a hardness test, an indenter is pressed on the surface of the material under test, and the extent to which it sinks into the material for a given pressure and time is an inverse measure of the hardness. How...