derive finte strain axes and magnitudes from deformation tensor after n-steps (in strain rate units of L) using the solution of Provost et al.2014 doi:10.1029/2001JB001734
Syntax
[fe, qe, Ea] = finiteStrain(L,n)Input
| L | velocityGradientTensor |
| n | time step in units of strainrate*2 of L |
Output
| fe | finite strain ellipsoid axis directions (vector3d) |
| qe | length of ellipse axes |
| Ea | finite strain tensor (Langrange) |