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Linear Strain

Applicable units are those of quantitykind:LengthRatio

A strain is a normalized measure of deformation representing the displacement between particles in the body relative to a reference length.

http://en.wikipedia.org/wiki/Deformation_(mechanics)

http://www.iso.org/iso/catalogue_detail?csnumber=31889

$\xi = \frac{\Delta l}{l_0}$, where $\Delta l$ is the increase in length and $l_0$ is the length in a reference state to be specified.

$\xi$

A strain is a normalized measure of deformation representing the displacement between particles in the body relative to a reference length.