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Principal Stresses

Entity names: P1, P2, P3, worstPS, vx, vy, vz
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 given by the three roots of the equation:

In addition the the three components of the normalized vector of worstPS are stored as well. The entity-names are: vx, vy, vz. They are derived from the following equation: