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Some Definitions

2.10.1 Ductility

“It is the ability of a metal to withstand elongation or bending”.

Due to this property wires of bigger diameter are reduced to smaller diameter through the holes of dies. (Called wire drawing).

 

2. 10.2 Malleability

“This is the property by virtue of which a material may be hammered or rolled into thin

sheets without rupture”.

 

2.10.3 Toughness

“Toughness or Tenacity is the strength with which the material opposes rupture”. The area under the stress-strain curve indicates the toughness (i.e., energy which can be absorbed by the material upto the point of rupture).

2.10.4 Brittleness

“Lack of ductility is the brittleness”. When a body breaks easily when subjected to shock load, it is said to be brittle.

 

2.10.5 Hardness

“It is the resistance of a material to penetration”. Hard materials resist scratches or being worn out by friction with another body.

 

2.10.6 Softness

The converse of hardness is known as softness”.

 

2.10.7 Plasticity

“It is the property that enables the formation of a permanent deformation in a material”.

 

2.10.8 Resilience

The strain energy stored by the body within elastic limit, when loaded externally is called ‘Resilience’. Maximum resilience up to elastic limit is ‘proof resilience’.

 

2.10.9 Modulus of Resilience

Proof resilience per unit volume of a piece is called ‘modulus of resilience’.