Posted by: charlot
maximum stress intensity - 09/14/16 04:34 PM
Hello everyone,
Would you tell me how the maximum stress intensity in B31.3 is calculated in caesar? or where I can find the formula?
Thanks
Posted by: Dave Diehl
Re: maximum stress intensity - 09/15/16 07:20 AM
The maximum stress intensity calculation is shown in Help. Go to the configuration file processor "SIFs and Stresses" branch and see the help on "Yield Stress Criterion".
Posted by: charlot
Re: maximum stress intensity - 09/15/16 06:50 PM
Thanks Dave. As I see in the "Yield Stress Criterion" help. the maximum stress intensity, assuming Sr=0, should be calculated as :
(Sl+Shoop)/2+√(((Sl-Shoop)/2)^2+St^2)
but it doesn't give me the right result. please let me know what I'm missing.
these are my output numbers for sustained load case at one node:
Sa: 1833.4
Sb: 258.4
St: -4
SH: 3835.5
Max Stress intensity: 4138.1
Code stress: 2091.9
Thanks
Posted by: Dave Diehl
Re: maximum stress intensity - 09/16/16 01:42 PM
I agree with your formula but I am uncertain of the content in Sa, Sb, etc. (regarding sif's).
Can you attach your C2 model & results associated with this data or maybe run a small (one pipe?) model that also illustrates your issue and attach that file here?
Posted by: charlot
Re: maximum stress intensity - 09/20/16 03:40 PM
Thanks Dave.Sure, I attached one of my models and checked the maximum stress intensity for node 6040. It doesn't give me the right number.
thanks a lot
Posted by: Dave Diehl
Re: maximum stress intensity - 09/26/16 10:39 AM
Charlot,
I have requested some development time to review the actual program code here.
In the meantime, here are my "hand calculations" for node 6040 on 6040-6050 using Load Case 5 (SUS) W+T1+P1:
Posted by: Dave Diehl
Re: maximum stress intensity - 09/27/16 12:55 PM
It turns out that the From Node has a sign issue for the axial load used in these non-Code stress calculations. The To Node does not show this error. The Code-defined stress calculations are also unaffected by this issue. This error has been recorded and will be corrected.