Abaqus FEA - Principal Stresses Field Output Question

[jczarne]

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

 

[rb1957]

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

 

[gurmeet2003]

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