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E

Elasticity

 is the ability of a body to resist a distorting influence and to return to its original size and shape, when that influence or force is removed.

Euler Buckling Load

When a column is loaded axially in compression, it is possible for it to become unstable before the material reaches its yield point. This load is termed the 'buckling load' or often the 'Euler buckling load' and is described by Pcr = pi2 * E I / L2.