Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
(OP)
Is it a legitimate practice to obtain delta Sn from a course meshed FEA model. I am looking at a report where delta Sp is taken from a model where a very fine mesh is used around a discontinuity, and then the model is run with a course mesh to obtain delta Sn. I can see how this would remove some effect of the stress intensity, but this does not seem to be the same as a linearized stress.





RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
Regardless, the M+B stresses are to be linearized, like you said, and not "peak" values from a coarse mesh taken. Perhaps the analyst does not know how to linearize?
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
Sounds to me, though, like the coarse mesh model has not converged. Punt it back to them, pointing out Article 5.1.2.3:
Get them to prove to you that the results are right. The burden of proof is not to you to say that the results are wrong.
Good catch.
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA
RE: Sec 8 Div 2 - primary + secondary equivalent stress range from FEA