Ductile
materials are characterized by their ability to yield at normal
temperatures. Brittle materials are
characterized by the fact that rupture occurs without any noticeable
prior change in the rate of elongation.
Yield Point
The yield point, alternatively called the elastic limit, marks the end of elastic behavior and the beginning of plastic behavior.
Elasticity
Elasticity is the tendency of solid materials to return to their original shape after being deformed
Plasticity
Plasticity describes the deformation of a material undergoing non-reversible changes of shape in response to applied forces.
Refferences:
[1] http://en.wikipedia.org/wiki/Plasticity_%28physics%29
[2] http://en.wikipedia.org/wiki/Elasticity_%28physics%29
[3] http://global.britannica.com/EBchecked/topic/653244/yield-point
[4] http://en.wikipedia.org/wiki/Stress%E2%80%93strain_curve
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