DIFFERENCE BETWEEN ELASTICITY & PLASTICITY?

Elasticity

Plasticity

Elasticity is the property of the solid material by virtue of which it tends to regain its shape after the removal of external load.

Plasticity is the property of the solid material by virtue of which it tends to retain its deformed shape even after the removal of external load.

Amount of elastic deformation is very small.

Amount of plastic deformation is quite large.

External force required for elastic deformation of solid is quite small.

Force required for plastic deformation is also higher.

Hooke’s Law of elasticity is applicable within this elastic region.

Hooke’s Law is not applicable if the material is plastically deformed.

Elastic deformation occurs prior to plastic deformation.

Plastic deformation occurs only after it is elastically deformed.

Mechanical and metallurgical properties of the solid material remain unaltered when it is elastically deformed.

Many properties of the solid material change considerably for plastic deformation.

Elasticity is an important consideration for:

• Machine tool structures
• Bridges, other civil frames
• Equipment body
• Many household structures and frames that should retain their shape.

Plasticity is an important consideration for:

• Sheet metal working
• Various forming operations such as rolling, forging, extrusion, etc.
• Rivet joining.