tensor.j2
Syntax
- f := tensor.j2(t)
Get the second deviatoric stress invariant. The tensor must be of size three. This is defined as \(J_2 = \frac{1}{6}[({\sigma}_x-{\sigma}_y)^2+({\sigma}_y-{\sigma}_z)^2+({\sigma}_z-{\sigma}_x)^2]+{{\tau}^2}_{xy}+{{\tau}^2}_{yz}+{{\tau}^2}_{zx}\) .
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