What is Poisson's Ratio.

In this video, Darryl explains what is Poisson's Ratio.

Poisson's ratio:
The absolute ratio of (a) the transverse to (b) the longitudinal normal strains in a strain field produced by a uniaxial stress along the longitudinal axis. The value is always between 0.0 and 0.5 for materials having isotropic mechanical properties.

Poisson strains:
Strains created in a material by an applied normal stress perpendicular to the axis of the applied stress.

Poisson bridge:
half or full bridge in which strain gages are connected in adjacent arms to measure the principal strains in a uniaxial stress field.