[CRI_CFD]

Dear all,

I am new in ASME BV FEM based analysis.

I have a couple of questions:

1. Is it mandatory to go for elastic-plastic analysis if R/t<4?
2. I have carried out a elastic analysis in a situation of R/t=1,4. The results based on linearized stresses allows the tank to pass (according to Pm, Pb...rules specified in the norm). But when I check Von-Misses stress plot and Safety factor, this is below 0,5. Does it makes sense? I mean, is it possible for a case to pass the criteria of ASME but fail in terms of safety factor based on Von-Misses stress? Remark that maximun allowable stress of the material has been obtained from values provided by ASME BVPC.

Thanks in advance for the advice.

Liam