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Principal Stresses

Entity names: P1, P2, P3, worstPS
The principal stresses are named P1, P2, P3. From the three principal stresses the absolute maximum value will be calculated and named worstPS. For example if a node has the three values 100, 0 and -110 MPa then -110 MPa would be shown. The three principal stresses are derived from the following equation:

They are given by the three roots of the equation (stress tensor is symmetric: = etc.):