tensor.i2
Syntax
Get the second stress invariant. The tensor must be of size three. This is defined as \(I_2 = {\sigma}_x*{\sigma}_y+{\sigma}_y*{\sigma}_z+{\sigma}_x*{\sigma}_z-{{\tau}_{xy}}^2-{{\tau}_{yz}}^2-{{\tau}_{xz}}^2\) .
f - second stress invariant
t - tensor
structure.from.map
tensor.j2
9.1.13