AMSE III Level D - Stress Intensities from ANSYS
AMSE III Level D - Stress Intensities from ANSYS
(OP)
I'm qualifying a structure to ASME III (NB) LEVEL D. The loading is seismic (DBE) and the loads on the structure are calculated using response spectrum analysis in ANSYS. There is a concern from the customer that the stress intensities calculated by ANSYS (and specifically required by the ASME code for qualification) are "non-conservative".
Has anyone ever come across this "concern" previously?
Cheers.
Has anyone ever come across this "concern" previously?
Cheers.
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RE: AMSE III Level D - Stress Intensities from ANSYS
It's been a long time since I've looked at Section III, but isn't level D basically don't fall on anything important?
Patricia Lougheed
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RE: AMSE III Level D - Stress Intensities from ANSYS
RE: AMSE III Level D - Stress Intensities from ANSYS
That said, forgive me for giving some detail here. The initial problem was generic to response spectrum analysis in terms of how the stresses are combined, and whether combining using either SUMTYPE,COMP or SUMTYPE,PRIN was meaningful in either sense for spectrum analyses. But it is now also a problem of how ANSYS is behaving. In ANSYS, the SUMTYPE,COMP and SUMTYPE,PRIN (as said) control how the stresses are derived/combined. If the SUMTYPE,COMP (default) command is used then one can view both component and principal stresses for the structure (SHELL63 elements). If the SUMTYPE,PRIN command is used then ANSYS does not give /any/ stresses for the solution, only strains. On the other hand, if the analysis is done with only pipe elements then ANSYS /does/ show (e.g. by issuing PLESOL,S,1) both component and principal stresses for SUMTYPE,PRIN. After lots of head scratching and running the problem in different versions of ANSYS (7.1 to 11.0) it is still the same. A mystery. It could be a bug.
Cheers.
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RE: AMSE III Level D - Stress Intensities from ANSYS
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