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The principle stress change their direction for an analysis non linear




I have a problem with changing stress direction axes index for a non linear (elasto-plasticity) analysis . My load principle is along axis-Z and after non linear analysis  (NL Static analysis) the corresponding principal stress direction is given as axis-X. Is there  a way to prevent this change of axis for non linear analysis ?


NB : this problem is not found in the case of linear static analysis.


Thank you for your explanation.