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  1. YuJie_PV

    some questions regarding the buckling analysis(5.4 of ASME VIII-2)

    thanks for your clarification, @TGS4. still some enquiry regarding point 1&2. 1. let me take the stress state in shell under internal pressure as an example. such state is familiar to all engineers. i plot the linearized min principal stress in the shell removed from discontinuity, and find...
  2. YuJie_PV

    some questions regarding the buckling analysis(5.4 of ASME VIII-2)

    hi all experts, i am looking at para.5.4 of 2023 asme VIII-2, and have some questions regarding the buckling analysis, please shed me some light: 1. "if the applied loading results in a compressive stress field within the component, buckling may occur, and an evaluation in accordance with 5.4...
  3. YuJie_PV

    1/2 loading for 1/2 model in ansys?

    thanks for all your reply, i think i've got your meaning. thanks
  4. YuJie_PV

    1/2 loading for 1/2 model in ansys?

    thanks for all replies. Yeah, the model is based on the example in ASME PTB-3. i know either 2D axisymmetric model or 90 degree slice of the model is available. here is the nozzle loading from my spec. see the bottom row of table: axial force FA=-12000N; resultant shear force FR=15000N...
  5. YuJie_PV

    1/2 loading for 1/2 model in ansys?

    hi experts, I'm working on a finite element analysis (FEA) of a pressure vessel, and I’m using a 1/2 model for the vessel and the nozzle. In this setup, should the forces and moments applied to the nozzle be considered as half of the complete loading, assuming the loading is symmetric? Any...
  6. YuJie_PV

    Fatigue Assessment - Elastic-Plastic Analysis SS316

    you may try "ASME STP-PT-081-2017 Cyclic Stress-Strain Curves".
  7. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    @hugo50ml, i think that's fraud. i‘ve examined UW-26(d) you mentioned, which intends that the welder doesn't necessarily be employed by the manufacturer directly. such practice, saving labor cost, isn't rare per my experience. such practice still require the manufacturer's ability on...
  8. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    @hugo50ml， the company applying for ASME STAMP have to prove its ability on manufacturing. According to my experience, a sample vessel shall be fabricated during joint review by ASME. the manufacturer holding the stamp may subcontract some parts, which is allowed by ASME code. please refer to...
  9. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    @hugo50ml, i think it's not available, just my opinion.
  10. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    @TGS4, thanks for the response, quite helpful.
  11. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    thanks IdanPV same worries with me, thus i believe selection of "Membrane+Bending" as a default in ANSYS would lead to a conservative result, because secondary stress may be included the stress。 i agree elastic-plastic is better, i just not quite get used to it presently. Thanks for your reply.
  12. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    @IdanPV, what is the reason? worries on the the categorization of stresses which requiring significant knowledge and judgment?
  13. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    Thanks IdanPV, i know that method you mentioned, my question is how to retrieve linearized primary stress in case that (S1 + S₂ + S₃) is larger than 4*S。 i guess maybe Table 5.6 " exmples of stress classfication" in VIII-2 shall be also used to identify if the stress is primary according to...
  14. YuJie_PV

    Membrane or Membrane+Bending when assessing local failure protection per ASME VIII-2

    hi All, i have a question regarding local failure criteria in the example of ASME PTB-3, shown as below: "5.3.2 Example E5.3.2 – Elastic Analysis In addition to demonstrating protection against plastic collapse, the following elastic analysis criterion shall be satisfied for each point in the...
  15. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    @TGS4， IdanPV, i am clear, thank you for your reply.
  16. YuJie_PV

    under what situation, the creep analysis is mandatory?

    sorry for the late response, i need more in-depth learning on creeping for further discussion. thanks for all your reply.
  17. YuJie_PV

    does ASME provide design-only certification of VIII-1 to a company?

    hi all, the salesman of my company checks with me if design-only certification is available under ASME VIIII-1. many years ago, i accidentally heard that ASME would provide design-only certification to a company? what is the current status? is design-only certification for ASME VIII-1 available...
  18. YuJie_PV

    under what situation, the creep analysis is mandatory?

    hi, all, a pressure vessel is designed to ASME BPVC VIII-1 or VIII-2, under what situation shall the creep analysis be mandatory? At temperatures in the range where creep and stress rupture strength govern the allowable stress? if yes, i am confused why creep analysis is required while...
  19. YuJie_PV

    An ASME interpretation regarding UW-11(a)(5)(-b)

    @Maslov, thanks, i am clear now.
  20. YuJie_PV

    An ASME interpretation regarding UW-11(a)(5)(-b)

    i am reading Interpretation "BPV VIII-1-19-11", and encounter a problem: Background: A vessel has a 14" NPS nozzle which is 15mm (0.59") thick with a Category C butt weld between the nozzle neck and a flange. The nominal thickness at the welded joint does not exceed the thickness in UW-11(a)(2)...

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