Definition of Poisson's ratio Poisson's ratio is the ratio of transverse contraction strain to longitudinal extension strain in the direction of stretching force.
Tensile deformation is considered positive and compressive deformation is considered negative. The definition of Poisson's ratio contains a minus sign so that normal materials have a positive ratio. Poisson's ratio, also called Poisson ratio or the Poisson coefficient, or coefficient de Poisson, is usually represented as a lower case Greek nu, n.
| n = - etrans / elongitudinal |
Strain e is defined in elementary form as the change in length divided by the original length.
| e = DL/L. |
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