ASME VIII div 2, 2007
ASME VIII div 2, 2007
(OP)
Hi,
I´m working with an elastic analyse of a pressure vessel and according to section 5.3.2 in ASME VIII div 2 2007 the following criterion shall be checked:
S1+S2+S3≤4S
What is this criterion and what do I check applying this? Shall I use the absolute values of the primary stresses when adding them?
Regards
I´m working with an elastic analyse of a pressure vessel and according to section 5.3.2 in ASME VIII div 2 2007 the following criterion shall be checked:
S1+S2+S3≤4S
What is this criterion and what do I check applying this? Shall I use the absolute values of the primary stresses when adding them?
Regards





RE: ASME VIII div 2, 2007
Cheers,
gr2vessels
RE: ASME VIII div 2, 2007
You do NOT use the absolute value of the local primary membrane plus bending principal stresses, but the algebraic value.
RE: ASME VIII div 2, 2007
However, I still wonder how I can sum three orthogonal principal stresses (S1+S2+S3) when they obviously aren´t pointing in the same direction?
Thanks again
RE: ASME VIII div 2, 2007
Just treat S1 S2 and S3 as magnitudes, not vectors. This is no different than determining the old Stress Intensity by taking the max algebraic difference of the principal stresses. No vectors involved there either.
jt