Engineering Materials and Manufacturing Processes - Lesson 1C

Engineering Materials and
Manufacturing Processes
Lesson 1C

,Mechanical Properties

Strength: It is the ability of a material to resist the
externally applied forces without breaking or
yielding.
Stiffness: It is the ability of a material to resist
deformation under stress.
The modulus of elasticity is the measure of
stiffness.
Elasticity: It is the property of a material to regain its
original shape after deformation when the
external forces are removed.

,Mechanical Properties
Plasticity: It is property of a material which retains the
deformation produced under load
permanently.
Ductility : It is the property of a material enabling it to be
drawn into wire with the application of a
tensile force.
A ductile material must be both strong and
plastic.
Ductility is usually measured by
percentage elongation and
percentage reduction in area.

, Brittleness: It is the property of a material opposite to
ductility.
It is the property of breaking of a material
with little permanent distortion.
Malleability: It is permits materials to be rolled or
hammered into thin sheets.
A malleable material should be plastic but
it is not essential to be so strong.