20.8.18

Properties of Materials.

Properties of Materials.

Mechanical properties of metals include those characteristics of Materials that describe the behavior under the action of external forces.

Elasticity:-

When Material subject to any External load it gets deform, the ability of any Material to Regain its Original shape after removal of External Load is Known as Elasticity.

Plasticity:-

When Material subject to any External load it gets deform, Material does not regain its Original shape after removal of External Load is known as Plasticity.

Ductility:-

It is the capacity of a material to go for maximum deformation under the action of tensile load without fracture.
Examples: Mild Steel, Lead, Nickel, Brass, Monal Metal, Manganese, Copper, Aluminum.

Brittleness:-

Brittleness is the property opposite to that of Ductility.
Brittleness is the lack of Ductility, i.e. Material cannot be stretches in Brittle.
 Materials failure takes place with a relatively smaller deformation means material to get broken into pieces when subjected to any load.
For Brittle Material fracture Point & Ultimate Points are same.
Examples:-Cast Iron, Glass, Concrete.

Malleability:-

It is a Property of Material which a material to be Extended in all direction without rupture.
A Malleable Material Possess a high degree of Plasticity.
Toughness:-
It is a Property of Material to absorb energy without fracture, it is Maximum bearing capacity of any Material.

Hardness:-

Hardness is the ability of a material to resist Indentation or Scratching or Surface abrasion.
Indentation Measured by:
·        Brinell hardness Method
·        Rockwell Hardness Method
·        Vickers Hardness Method
·        Knoop Hardness Method

Fatigue:-

We know that material behave differently under static and dynamic loading.
The behavior of material under Dynamic loads (Variable loads) is referred as Fatigue.

Creep:-

At any temperature a material will progressively deform with the passage of time under constant loading even if the stress is below Yield point this phenomenon is called Creep.
Resistance to deformation under self-load is called Creep Resistance.

Resilience:-

 Resilience is the capacity of a material to absorb energy when it is the elastically deformed & then to release the total energy on unloading.
Or
The energy which is stored in a body within elastic limit is called a Strain Energy or Resilience    

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