Hi,

My understanding from the Quick Reference Guide is that sqrt(Sb^2+4St^2) < f[1.25(Sc+Sh)-Sl] for Code B31.3. And this f (stress range reduction factor) can be found using equation (1c) from B31.3 based on the number of operating cycle.

My question is how does CAESAR II compute the stress range reduction factor given that the number of operating cycle is not required to be entered in the input page.

Regards,

Steve

You need to enter the correct 'f' factor. It may be defaulted to 1.0

Can you be more specific where to enter this correct 'f' factor? Thanks

On the Input Spreadsheet, click on the Allowable Stresses tab. I assume you are using B31.3.

You have SC and SH1 thru SH9 (allowable stresses for each temperature) and F1 thru F9, the respective 'f' factor for each thermal case.

I tried to find more information about this stress range reduction factor on CAESAR II User Guide however I could not find any. My last question is "Is this defaulted to 1.0 if no value is entered?"

Yes "f" defaults to 1.0 if not entered.

You can define the number of cycles in two places:

1) In the input, the "f" field can be used to define either "f" or the number of cycles. CAESAR II assumes any value greater than 2 is a cycle count here.

2) In the Static Load Case Editor, click on the [Load Cycles] button. For the desired Expansion Load cases, define the number of cycles. CAESAR II will then compute "f" for this specific load case.

For B31.3, there is a radio button to set default(?) f to 1.2.