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Abaqus FEA - Principal Stresses Field Output Question

Abaqus FEA - Principal Stresses Field Output Question

Abaqus FEA - Principal Stresses Field Output Question

(OP)
I want to plot the Gerber Interaction Formula  for fatigue life requirements in Abaqus.

If I go to field outputs and create my own field output is there anyway to make an equation using the principle stresses.  
The Gerber equation is

alternat stress/       +   (mean stress/yield stress)^2 = 1
endurance limit             

   
.5(max prin - min prin) + (0.5(max prin + min prin)^2 = 1
-----------------------   -------------------------
endurance stress              (yield stress)


what would I use as the values in Abaqus for the max and min principle stress????  How would it be entered into a formula...meaning

the way the stress components are entered.  

example
"s1f6_S" for a basic stress component


Thanks much

RE: Abaqus FEA - Principal Stresses Field Output Question

i don't know abaqus, but i do know it's principAL ... jeez

RE: Abaqus FEA - Principal Stresses Field Output Question

See the reply in the ABAQUS forum. rb1957 take it easy, it could by a typo!
Gurmeet

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