10 May 2019 Elasticity and Plasticity
Elasticity is the deformation of a solid material that is completely reversed once the external load that has caused the deformation has been removed. That means, after removing the external load, the part is again undeformed.
Plasticity in contrary is the non-reversible deformation of a solid part, that means, after removing the external load, there will still be some deformation left.
A deformation is purely elastic if the stress in the part is below the Elastic Limit (sometimes called Yield Limit). If the stress is above the Elastic Limit, the deformation is a combination of elasticity and plasticity. In that case, after removing the external load, the elastic part of the deformation will disappear, but the elastic deformation will remain.
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