[tag] poissons_ratios

Three Poisson's ratios $\nu_{12}$, $\nu_{23}$, and $\nu_{13}$ in that particular order.

The other Poisson's ratios $\nu_{21}$, $\nu_{32}$, and $\nu_{31}$ are calculated by the symmetry property as $\nu_{ji} E_i = \nu_{ij} E_j$ (no sum).

They also must fulfil following two properties:

$$|\nu_{ij}| < \sqrt({E_i \over E_j}),$$

and

$$1 - \nu_{12}\nu_{21} - \nu_{23}\nu_{32} - \nu_{13}\nu_{31} - \nu_{12}\nu_{23}\nu{31} - \nu_{32}\nu_{21}\nu{13} > 0.$$

Additional info

No additional info.

Used in the following test data files

Used in no end-to-end test cases.