## Poisson's ratio |

**poisson's ratio**( ) is a measure of thenu **poisson effect**, that describes the expansion or contraction of a material in directions perpendicular to the direction of loading. the value of poisson's ratio is the negative of the ratio of to axialtransverse strain . for small values of these changes, is the amount of transversal expansion divided by the amount of axial compression. most materials have poisson's ratio values ranging between 0.0 and 0.5. incompressible materials such as rubber, have a ratio near 0.5. the ratio is named after the french mathematician and physiciststrain .siméon poisson - origin
- length change
- volumetric change
- width change
- isotropic materials
- anisotropic materials
- orthotropic materials
- transversely isotropic materials
- poisson's ratio values for different materials
- poisson function
- applications of poisson's effect
- see also
- references
- external links

**Poisson's ratio** (**Poisson effect**, that describes the expansion or contraction of a material in directions perpendicular to the direction of loading. The value of Poisson's ratio is the negative of the ratio of