MECHANICAL PROPERTIES OF MATERIALS:
1. Strength: Ability to resist external load without fracture, breaking or yield
2. Stiffness: Ability to resist deformation under stress
3. Elasticity: Ability to regain original shape after deformation under external load e.g:- rubber
4. Plasticity: Ability to do not regain original shape after deformation under external load e.g:- forging,stamping
5. Ductility: Ability to drawn into wire with application of tensile force. e,g:-mild steel,lead,copper, zinc,tin
6. Malleability: Ability of a material to rolled or hammered into thin sheets. e.g:- soft steel,lead,copper,wrought iron,aluminum.
7. Brittleness: Property of a material with which the material breaks with little permanent distortion. e.g:- cast iron
8. Toughness: Energy absorbed by material during fracture under unit volume. This property decreases when heated.
9. Machinability: Property which permits the material to go for machining operations such as cutting.
10. Resilience: Amount of energy absorbed per unit volume within elastic limit. This property is essential for spring materials.
11. Creep: Material subject to constant stress at high temperature for long period of time undergo slow deformation. It occurs in IC engines, boiler and turbines.
12. Fatigue: Material subject to repeated stress, fails below yield stress. It occurs in designing shafts, connecting rods, springs, gears
13. Hardness: Resistance to indentation, wear, scratching, deformation.