Poisson's Ratio

Poisson’s ratio is defined as the ratio of lateral strain over longitudinal strain, which is
the result of the application of stress on a material. Consider a solid cylinder subjected
to stress in a longitudinal or vertical direction. The effects are:

• Increase in cylinder diameter in lateral direction

• Decrease in cylinder length in longitudinal direction

As a result, Poisson’s ratio is expressed as:

Where:

v = Poisson’s Ratio