Hi all please check the following link: as you can see it's a pipe system modeled with shell181 elements subject to internal pressure (only) i need help about the membrane stress i get at the nozzle intersection - it should be considered local membrane stress so the allowable stress limit should be 1.5S, is it correct? Mcboot 1 7 ps2 to usb. - or maybe, since it's a very high geometry discontinuity location, i can consider the allowable stress limit equal to 3S? I have been increasing the main pipe and the nozzle equivalent tickness to low down the membrane stress but the solution i'm getting out is not cheap and hard to build any nice tip would be very appreciated thanks RE: Ansys Asme Pipe Stress Analysis - fast question (Structural). Jos007 - unfortunately, evaluating the results If a finite element analysis to the piping or BPV Code is slightly more nuanced than your questions imply. It appears that you are trying to perform an evaluation in accordance with ASME Section VIII, Division 2, Part 5, correct? Probably you have arrived there by apply the 'unlisted component' rules if ASME B31.3? What other loads are there on the component?

You will need to evaluate those, too. Be glad to help you but I would need to know the whole picture. Are you expecting any cyclic loading? How about vacuum conditions or anything else that might result in compressive loads? RE: Ansys Asme Pipe Stress Analysis - fast question (Structural).

Oct 23, 2014 - Keywords: Multilayer; perturbation; torispherical pressure vessel heads; buckling. Ansys Workbench version 14 is used for the finite element.

You are mixing two different failure modes. If you are actually following the rules of ASME Section VIII, Division 2, Part 5 (2013 Edition), then you will know that for satisfying Protection Against Plastic Collapse, the local membrane equivalent stress should be less than Spl (which is the greater of 1.5S or Sy). If that is not met, then your have not satisfied this failure mode.

For satisfying Protection Against Failure From Cyclic Loading: Ratcheting, then the RANGE of primary-plus-secondary membrane-plus-bending should be less than Sps (which is the greater of 3S or 2Sy). Whether or not this is met, you still need to satisfy the other failure modes. And, for that configuration, you would still need to satisfy Protection Against Collapse From Buckling and Protection Against Local Failure. On the last one - Protection Against Local Failure, your geometry is one that is susceptible to such a failure mode. And a shell model is insufficient for making such a determination (the issue is in the inside corner of the lateral). RE: Ansys Asme Pipe Stress Analysis - fast question (Structural). Evening All, here: you can find my stress analysis of the solid model regarding the failure check against internal presure (only) according to ASME VIII div2 2013 My biggest doubt is about the stress categorization, i'm not sure to consider the nature of the bending stress @ the nozzle intersection correctly: as you can see in the 'report', i assume the primary bending stress Pb = 0 (always) @ nozzle intersections, because it's a strong local discontinuity region so, to check the stability of the item, i execute the following checks: considering A516 Gr65 @20°C (Sy/Su.

A couple of comments: A) You need to ensure that you are performing the Protection Against Plastic Collapse checks using the Design Pressure, and not the hydrostatic test pressure. B) Your assessment that, at the intersection, there is no Pb is appropriate. C) When performing the ratcheting check, you should be using the operating load ranges. See D) When performing the Protection Against Plastic Collapse and the Local Failure check (4S), you need to be using the load case combinations described in Table 5.3 E) You are using ANSYS.