The document discusses various mechanical properties of materials including strength, stiffness, elasticity, plasticity, ductility, brittleness, hardness, toughness, fatigue, creep, resilience, and malleability. Strength is the ability to withstand load before failure. Stiffness is the resistance to deformation under stress. Elasticity and plasticity refer to a material's ability to return to its original shape or retain a deformation, respectively. Ductility allows drawing a material into a wire while brittleness causes brittle fracture. Hardness measures resistance to surface indentation. Toughness is the ability to absorb energy without fracturing. Fatigue and creep describe effects of repeated or sustained loading. Resilience and malleability

1. Mechanical
Properties of
Materials
Strength
Stiffness
Elasticity
Plasticity
Ductility
Brittleness
Hardness
Toughness
Fatigue
Creeep
Resilience
Malleability
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2. STRENGTH STIFFNESS
The measurement of how much load a material can
withstand before failure. The more load a material
can bear, the more strength it has. There are 3
different types of strength based on loading types,
which are compressive strength, shear strength and
tensile strength.
Stiffness is the ability of a material to resist
deformation under stress. It is an indicator of the
tendency for an element to return to its original
form after being subjected to a force. The modulus
of elasticity is the measure of stiffness.
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Compressive Tensile Shear

3. ELASTICITY PLASTICITY
It is the property of a material to regain its original
shape after deformation when the external forces
are removed. This property is desirable for
materials used in tools and machines.
Plasticity is inverse of elasticity. It is a property of a
material which retains the deformation produced
under load permanently. Plastic deformation will
take place only after the elastic range has
been exceeded.
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Load applied Deformation due to load
Load removed
Load applied
Load removed
Deformation due to load

4. DUCTILITY BRITTLENESS
Ductility is the property of a material enabling it to
be drawn into a wire with the application of a
tensile force. A ductile material must be both strong
and plastic. The ductility is usually measured by the
terms, percentage elongation and percentage
reduction in area.
It is the property of breaking of a material with little
permanent distortion. Brittleness of a material is
opposite to ductility property. Brittle materials are
withstanding compression load. When subjected to
tensile loads snap off without giving any sensible
elongation.
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5. HARDNESS TOUGHNESS
Hardness is the ability of the material to resist
surface abrasion or indentation. A Brinell number is
the indication of the hardness of any material.
It is the ability of a material to absorb energy
without fracture. Material under cyclic and shock
loading need to be tough. Bend test is done to
identify toughness of the material.
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6. FATIGUE CREEP
The fatigue is the long effect of repeated straining
action which causes the strain or break of the
material.
The creep is a slow and progressive deformation of
a material with time at a constant force.
The simplest type of creep deformation is viscous
flow.
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7. RESILIENCE MALLEABILITY
The ability to absorb energy while being elastically
deformed, and releasing that energy after being
unloaded. Proof resilience is the maximum amount
of energy a material can absorb before permanent
deformation.
The ability to plastically deform a material or
significantly change its shape without becoming
fractured. It is a special case of ductility which
permits materials to be rolled/hammered into thin
sheets, making wire. A malleable material should
be plastic but it is not essential to be so strong.
Tensile load applied
Deformation due to
applied tensile load

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