Elasticity & plasticity

1. ELASTICITY &
PLASTICITY
P/B :- DR NIYATI PATEL 1

2. Elasticity
• The property of a body by virtue of which it tends
to regain its original shape and size when deforming
force is removed is called elasticity
• Quartz and phosphor bronze are the example of
elastic bodies
• No body in nature is perfectly elastic. In other words,
a deforming force does produce permanent effect in
shape or size in every body to some or more extent.
In certain cases, it may not be visible to the naked eye
P/B :- DR NIYATI PATEL 2

3. • Elasticity is the ability of soft tissue to return to its
prestretch resting length directly after a short-
duration stretch force has been removed.
• Viscoelasticity is a time-dependent property of soft
tissue that initially resists deformation, such as a
change in length, of the tissue when a stretch force is
first applied.
P/B :- DR NIYATI PATEL 3

4. P/B :- DR NIYATI PATEL 4

5. Plasticity
• A body which does not have any tendency at all to
regain its original shape and size on the removal of
the slightest deforming force is called a plastic body
• When wet clay is deformed by a force, it remains
deformed
• Plasticity is the tendency of soft tissue to assume a
new and greater length after the stretch force has
been removed
P/B :- DR NIYATI PATEL 5

6. HOOK’S LAW
• States that, for relatively
small deformations of an
object, the displacement or
size of the deformation is
directly proportional to the
deforming force or load.
Under these conditions the
object returns to its original
shape and size upon removal
of the load
P/B :- DR NIYATI PATEL 6