Basis of Principal stresses in ASME Div2
Basis of Principal stresses in ASME Div2
(OP)
Dear All,
According to ASME Div 2 (5.3.2)for the elastic stress analysis method summation of the principal stresses must be lower than 4S. From a CAESAR model there are two different type of loads, operating and sustain. If i want to calculate the principal stresses by a software (e.g nozzle pro) what type of the loads (operating or sustain) should i use in nozzle pro?
Thanks in advance
According to ASME Div 2 (5.3.2)for the elastic stress analysis method summation of the principal stresses must be lower than 4S. From a CAESAR model there are two different type of loads, operating and sustain. If i want to calculate the principal stresses by a software (e.g nozzle pro) what type of the loads (operating or sustain) should i use in nozzle pro?
Thanks in advance





RE: Basis of Principal stresses in ASME Div2
RE: Basis of Principal stresses in ASME Div2
REFERENCE: ASME PTB-3-2010 SECTION VIII-Division 2 Example Problem Manual
READ: ASME Div 2 (5.3.2) Problem E5,3,2 Elastic Analysis page 5-19
RE: Basis of Principal stresses in ASME Div2
In the example you mentioned there are no external forces and moments. only internal pressure considered.
RE: Basis of Principal stresses in ASME Div2
In CAESAR II, operating = sustain + thermal.
The code says "primary membrane plus bending", that in terms means "PL+PB", no "Q" invloved. And thermal load is "Q",
so you shall use "sustained loads" from CAESAR II.
The sustained loads are from pressure and dead weight, which indeed will generate primary membrane and bending stresses.
My two cents only.
RE: Basis of Principal stresses in ASME Div2
(As an aside - you may ask yourself - how does this guy know. Well, I wrote several papers on this topic. These papers were referenced when I re-wrote/clarified the requirements in the new Division 2. I am currently undertaking a project to clarify/re-write Table 5.6, so as to avoid the confusion the jtseng123 has indicated, by comparing two completely different Codes with completely different intents/purposes...)
RE: Basis of Principal stresses in ASME Div2
RE: Basis of Principal stresses in ASME Div2
RE: Basis of Principal stresses in ASME Div2
RE: Basis of Principal stresses in ASME Div2
(Of course, after the Committees go through it, it may look nothing like what was peer-reviewed initially here, but I guess that the nature of consensus work...)
RE: Basis of Principal stresses in ASME Div2