Mechanical Properties

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.



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