In ANSYS Release 11.0, how does AVPRIN affect stress calculations in a Random-Vibration Analysis (PSD)?

If AVPRIN is not issued, by default, the Segalman-Reese method is used to calculate the equivalent stress (Seqv). The Segalman-Reese method calculates Seqv without calculating the principal stresses. Thus, the stress printout (PRNSOL,S,PRIN) will show zero values for all principal stresses and the stress intensity (Sint). Only Seqv will have a value associated with it.

If AVPRIN,0 or AVPRIN,1 are issued, the principal stresses are calculated using the appropriate method (as explained in the Notes section for the AVPRIN command). Sint and Seqv are then calculated from the principal stresses. Thus, if either AVPRIN,0 or AVPRIN,1 are issued, Seqv is not calculated using the Segalman-Reese method. If AVPRIN is not issued, the program internally issues an undocumented option on the AVPRIN command (AVPRIN,2) to trigger the Segalman-Reese calculations. AVPRIN,0 is not default.

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