One Stop Hub For Mechanical Engineers

Hardness

i. It is the property of the material to resist scratching, abrasion, indentation or penetration.

ii. Hardness of a material is stated relative to the hardness of other material.

iii. Important in shafts, bearing whichever is having relative motion.

Toughness

i. Ability of a material to withstand both elastic and plastic deformation, shock and vibration.

ii. Toughness is measured in terms of the energy a material can absorb before a actual failure takes place.

iii. Important in structural members, machine parts which are subjected to shock and vibration. E.g. shafts, spring.