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Recent content by victor6397

  1. victor6397

    Question about Ratcheting (ASME Sec. VIII Div.2)

    Thanks again for your help. My comparison between plastic collapse and ratcheting is based on the paper "Global Ratcheting by elastic plastic FEA according to ASME Section VIII Rules" by Kalnins where you can read, among other things: Hence my confusion about mixing failure modes and...
  2. victor6397

    Question about Ratcheting (ASME Sec. VIII Div.2)

    Thank you so much for your response. Right, maybe I'm mixing both methods, because unlike other failure modes, some post-processing tasks are necessary even with the elastic plastic method, and therefore I was trying to understand the basics of this failure mode. From what I can understand...
  3. victor6397

    Question about Ratcheting (ASME Sec. VIII Div.2)

    Thanks for the articles, very interesting, but my question is more related to the areas where this failure mode is possible. I know that ratcheting is a global failure mode, and that cyclic plastic strains at local discontinuities are considered to reach shakedown.However, the concept of...
  4. victor6397

    Question about Ratcheting (ASME Sec. VIII Div.2)

    Hello mates, I have some doubts regarding ratcheting, and I hope you can help me a bit. As I have read, and as can be seen in the Bree diagram, for ratcheting to take place a source of sustained primary stresses and a source of cyclic secondary loads is necessary. In that case, why is it...
  5. victor6397

    Plastic Collapse and ratcheting assessment locations

    Hello, I'm trying to understand the rationale for limiting the evaluation of plastic collapse and ratcheting to basic structural elements, rather than transition elements or discontinuities. I've been searching for info about this and haven't found a clear answer, at least to my limited...
  6. victor6397

    Doubt about the Hot Spot Method in Shell Elements

    With the hot spot method you get the structural stress (membrane plus bending), eliminating the peak component (pressure vessel analysis terms). In shell geometries, you obtain the stress on the mid-surface, and in the post-processing the stress is extrapolated linearly to the theoretical outer...
  7. victor6397

    Doubt about the Hot Spot Method in Shell Elements

    Hello, I have some doubts about some concepts, maybe very basic, but I hope you can help me. I know that hot spot is a method to eliminate peak stress, normally from the weld toe to evaluate fatigue in S-N curves that do not require this component, but I have also seen this method used in shell...
  8. victor6397

    Elastic-plastic fatigue assessment ASME VIII-2

    Hello, sorry if the question is very basic (I'm starting with ASME) but need to perform a fatigue analysis of a pressure vessel between 0 and 25 MPa according to ASME VIII-2. I have compared the two elastic-plastic methods (Twice Yield and Cycle-by-cycle) and the results are very different, so I...
  9. victor6397

    Peak stress in shell elements ASME VIII div.2

    Thank you very much TGS4, I am learning a lot by reading your posts and replies
  10. victor6397

    Peak stress in shell elements ASME VIII div.2

    Hello mates,I'm getting into pressure vessels calculation with ASME VIII div.2 and I have some doubts about stress linearization (I know only non linear analysis are suitable for inexperienced people like me [smile] ) Maybe the question is very silly, but I'm still learning and i haven't found...
  11. victor6397

    Fatigue analysis for C95800 in ASME BPVC Sec VIII div.2

    Hello! I have to perform a fatigue analysis of an element of material C98500 (Nickel-aluminium bronze or copper alloy), but none of the curves in annex 3-F fits well. Maybe the one in c) for 70-30 coppe-nickel? Can someone help me or give me some ideas on how to do it? I can use other codes as...
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