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 you have theoretically v = 0.5. However,
v=0.495 is suggested 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 |