Elastic Body:
➦ When
an external force acts on a body, the body tends to undergo some deformation.
If the external force is removed and the body comes back to its original shape
and size (which means the deformation disappears completely), the body is known
as elastic body.
Elasticity:
➦ This property, by virtue of which certain materials return
back to their original position after the removal of the external force, is
called elasticity.
Elastic Limit:
➦ The body will
regain its previous shape and size only when the deformation caused by the
external force, is within a certain limit. Thus there is a limiting value of
force upto and within which, the deformation completely disappears on the
removal of the force. The value of stress corresponding to this limiting force is
known as the elastic limit of the material.
➦ If the external force is so large that the stress exceeds the
elastic limit, the material loses to some extent its property of elasticity. If
now the force is removed, the material will not return to its origin shape and size
and there will be a residual deformation in the material.
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