computes the Poisson ratio of an elasticity tensor
Description
\[\nu = \frac{-S_{ijkl} x_i x_j y_k y_l}{S_{mnop} x_m x_n x_o x_p}\]
Syntax
varargout = PoissonRatio(C,varargin)Input
| C | elastic stiffnessTensor | 
| x | vector3d | 
| y | vector3d | 
Output
| nu | Poisson ratio in directions x and y |