In the last lecture, we have defined some of the important mechanical properties that a designer has to take care of to prevent failure of the load bearing members.

Many a times, the surface properties of a component, plays an important role in determining the quality of the product. For example, the efficiency of an IC Engine, gear box or drive trains depend largely on the surface integrity of its’ components.

The following properties are grouped under surface properties of materials:

• Hardness and Micro-hardness
• Modulus of Rupture
• Surface Roughness and Friction Coefficient
• Wear and Corrosion Rate