Hi,
I would like to get the necessary conditions if a isotropize the elastic tensor.
Normally each elastic tensor depends on the symmetry of the considered material.
For example, for the cubic symmetry tensor, there are 3 elastic constants in this tensor: c11, c12 and c44.
I would like to know how it is possible to get the isotropic condition: c11=c12+2.c44.
And second, if i take an another symmetry,how it is possible to get the isotopic conditons of each symmetry.
Tahnak you, Ravi