Hi!
I would appreciate some help with fatigue analysis of a pressure chamber using EN 13445-3. I did finite element analysis and got maximum stress, i.e stress range for the given load cases. Firstly, I'm not sure if I can use Clause 17, instead of Clause 18. I planned on using Clause 17 since under Conditions of applicability it says 'For fatigue assessment of parts designed in accordance with Annexes B or C, use of this clause is allowed under the condition that the stress ranges taken into account are those resulting from a detailed stress analysis, instead of those given by Equation (17.6-1).' So, I took pseudo-elastic stress range from the results of the FE analysis, instead of using the given formula.
My second question is regarding formulas for welded/unwelded region in Clause 17. I have reinforcements on the chamber which are welded so I assume I should be using both of these formulas depending on the location of the maximum stress? I used surface model for FE analysis and didn't model the welds if that's important.
Thanks in advance!
I would appreciate some help with fatigue analysis of a pressure chamber using EN 13445-3. I did finite element analysis and got maximum stress, i.e stress range for the given load cases. Firstly, I'm not sure if I can use Clause 17, instead of Clause 18. I planned on using Clause 17 since under Conditions of applicability it says 'For fatigue assessment of parts designed in accordance with Annexes B or C, use of this clause is allowed under the condition that the stress ranges taken into account are those resulting from a detailed stress analysis, instead of those given by Equation (17.6-1).' So, I took pseudo-elastic stress range from the results of the FE analysis, instead of using the given formula.
My second question is regarding formulas for welded/unwelded region in Clause 17. I have reinforcements on the chamber which are welded so I assume I should be using both of these formulas depending on the location of the maximum stress? I used surface model for FE analysis and didn't model the welds if that's important.
Thanks in advance!
