It is a seminar useful to M.Tech machine design students

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WELCOME

2. “PERFORMANCE CHARACTERISTICS
OF MATERIALS”
BY
N.SUDHEER
(M.TECH-MACHINE DESIGN)
16481D1509
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3. It a characteristic of a piece of equipment/ material/
part, determined during its testing or during its operat
-ion.
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4. The performance or functional requirements of a
material usually are expressed in terms of physical,
mechanical, thermal, electrical, and chemical
properties.
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5. The property of a material is a characteristic of the
material that influences qualitatively or
quantitatively the response given by the material
for a particular performance under particular
condition.
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6. Fig: Inter-relation between structure, properties, and processing to
performance of materials
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7.  The properties of engineering materials mainly depends on the
internal arrangement of the atoms on molecules(structure).
Thereby properties also.
 The proper selection of manufacturing process is might be
influence the performance of materials.
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8. Since it is almost impossible to select a material for a specific
task unless otherwise its properties are known.
There are less chances of material possessing optimal or idle
combination of properties.
A need to trade off between number of factors!
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9. So many materials,… so much information….
How do we decide?
How do we begin to choose?
First we need to look at the function of the product……!!!!!!
Where does it work?
How does it work?
Who uses it?
What should it cost?
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10. Mechanical properties-
strength, ductility, brittleness etc.
Processing properties-
weld ability, cast ability, etc.
Physical properties-
dimensions, density, etc.
Thermal properties-
melting point, thermal conductivity, etc.
Chemical properties-
reactivity, corrosion resistance, etc.
Electrical properties-
electrical conductivity, electrical resistivity, etc.
And last, but not least……….
cost and availability!!!!!!!!
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11. List of mechanical properties:
 Strength
 Elasticity
 Plasticity
 Ductility
 Malleability
 Brittleness
 Resilience
 Toughness
 Hardness
 Fatigue
 Creep
 Wear resistance
 Damping capacity
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12. 1.STRENGTH:
Strength is the ability of material to resist deformation. The strength of a component is
usually considered based on the maximum load that can be withstood before going to
failure.
2.ELASTICITY:
It is the ability of material to regain its original shape after removal of external applied
forces.
3.PLASTICITY:
It is the ability of material to retain its shape (deformed shape) after removal of external
applied forces (permanent deformation).
4.DUCTILITY:
The ability of a material to undergo large permanent deformations in tension i.e., property
which enables a material to be beaten or rolled into thin sheets is known as ductility.
5.MALLEABILITY:
The ability of a material to undergo large permanent deformation in compression is known
as malleability.
6.BRITTLENESS:
Lack of ductility is known as brittleness. When a body breaks easily when subjected to
shocks it is said to be brittle.
7.RESILIENCE:
Resilience is the ability of the material to absorb energy when it is elastically deformed by
loading and then upon unloading the release of the same amount of energy.
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13. 8.TOUGHNESS:
It is the ability of material with which the material opposes rupture or fracture.
9.HARDNESS:
Resistance to penetration or indentation is known as hardness.
10.FATIUE:
Fatigue is a phenomenon that leads to fracture or failure that takes place under repeated
fluctuating loads or stresses.
11.CREEP:
Creep can be defined as the time dependent and permanent deformation of materials when
subjected to a constant load or stress.
12.WEAR RESISTANCE:
Wear resistance is defined as the ability of the material to resist wear, tear and abrasion.
13.DAMPING CAPACITY:
The ability of material to dissipate vibrational energy by internal friction into heat.
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14. Weld ability
Cast ability
 Machinability
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15. oDimension
oColour
oDensity
oPorosity
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16. Melting point
Thermal expansion
Thermal conductivity
Heat resistance
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17. Electrical conductivity
Electrical resistivity
Super conductivity
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18. Atomic bonding
Corrosion resistance
Reactivity
Surface energy
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19. So, while selecting the materials you should know the
performance of candidate material and you need to check the
following factors:
The ease of availability of the materials
The quantity of material required
The shape, size and condition in which the material is
available.
Material performance index
Cost of material
Cost of processing , etc.
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20. Thank you
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