Stresses in Axisymmetric Calculations

[jpark]

Principal stresses are the eigenvalues of the stress tensor.
So, please refer to the following discussion:

How to find eigenvalues and eigenvectors of a tensor for post processing?

Hi everyone, I am working on a full coupling problem of three differential equations. One of the equations is the linear elasticity equation, in which we solve for the displacement u. Then, using the displacement solution, we can solve for the strain and eventually solve for the stress tensor. For postprocessing purposes, I want to get the principle stress and their respective directions. To do that, we have to find the eigenvalues and eigenvectors. I have tried to use NumPy to do that, but I s…