Poisson's ratio

When a material is compressed in one direction, it tends to expand in the other two directions perpendicular to the direction of compression. This phenomenon is called the Poisson effect. Poisson's ratio v is a measure of the Poisson effect.

Poisson's ratio bounded by two theoretical limits: -1 < v ≤ 0.5. In fact that E, G, and K are all positive and mutually dependent. However, it is rare to encounter engineering materials with negative Poisson ratios. Most materials will fall in this range: 0 < v ≤ 0.5. For perfect incompressible material we have theoretically v = 0.5. However, we suggest v=0.495 in order to avoid too small time steps.

Material Poisson's ratio
Gold-pure 0.42
Aluminum 0.33
steel 0.27 – 0.3
Titan 0.3
Foam 0.1 – 0.4
Concrete 0.2
Glass 0.24 – 0.29
Rubber 0.48 – ~0.5
Cork ~0
Polystyrene 0.34