Stress combination
Stress combination
(OP)
Good day,
I am currently developing a FEA analysis to a pipe line system, this system is under high temp (1200F) and high pressure (300 psig). This system has previous selected expansiom joints. I have run seperate analysis, the first consider the thermal expansion due to the temperature and the reactions that the expansion joints that this system has. The second analysis considers the stresses due to the internal pressure. I wonder if there is any method to obtain an equivalent stress from the 2 stresses of each FEA analysis.
Thanks!
I am currently developing a FEA analysis to a pipe line system, this system is under high temp (1200F) and high pressure (300 psig). This system has previous selected expansiom joints. I have run seperate analysis, the first consider the thermal expansion due to the temperature and the reactions that the expansion joints that this system has. The second analysis considers the stresses due to the internal pressure. I wonder if there is any method to obtain an equivalent stress from the 2 stresses of each FEA analysis.
Thanks!





RE: Stress combination
another day in paradise, or is paradise one day closer ?
RE: Stress combination
Do you mean add both stresses into one main stress? (Stresses due to Thermal reaction + stresses due to internal pressure?)
I do not run both conditions into 1 FEA analysis because the computation time is really big and also because the results seems strange.
Regarding superposition, I know that to add them we need to consider the direction of the stress, but as this geometry is really complex, I am not really sure if the hoop stresses are oriented in the direction that the bending, compressive and tension stresses are.
is the addition of the both principal stresses (Maximum stress due to Thermal reaction + Maximum stress due to Internal pressure) a valid approach?
Regards,
RE: Stress combination
don't add principal stresses, unless you prepared to accept the conservative approach. since the principals will (almost certainly) have different directions, adding magnitudes is conservative.
another day in paradise, or is paradise one day closer ?
RE: Stress combination
RE: Stress combination
another day in paradise, or is paradise one day closer ?
RE: Stress combination
RE: Stress combination
Thanks!
RE: Stress combination
Piping analysis is pretty simple for a piping stress engineer. You seem to be making this much more difficult than it needs to be...
RE: Stress combination