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  1. Russ A

    ASME VIII Div 2 (2023 Edition) Part 5 - Elastic-Plastic Buckling Method B

    Hi all, I am struggling to understand the correct approach in ASME VIII Div 2 Part 5 2023 Edition for elastic-plastic buckling (Method B). Step 1 is clear. Step 2; is the suggestion that the linear elastic buckling displacements are factored by the manufacturing tolerance (or measured...
  2. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    Hi TGS4, thanks for your responses so far. Do you have any further thoughts on this?
  3. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    I'm not at my computer to check, but I've potentially given you values adjusted by E, but I've also ran E = 1. It's 200degC so no derating if I remember correctly.
  4. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    579 mm OD, 10 mm wt, 3 mm CA, 2:1 elliptical head, 4500 mm between saddle supports, 6445 overall length. One thing I should have been clearer about, this is a FFS of an older vessel using API 579-1. Therefore the Beta load factor is 3.6 (M of 4 x RSFa), which means the benefit of using...
  5. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    I had run a sub model which was effectively the plain cylinder only. The hoop stress is considerably higher for a given pressure than the hand calc hoop stress, I believe this is purely a function of the non-linear geometry. At high strains the radius increases significantly enough that stresses...
  6. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    Hi TSG4. Thanks for your response. UTS = 410 MPa, 572 MPa true stress. It is a multi-linear elastic-plastic curve in accordance with ASME VIII Div 2 Annex 3-D.3. Yield is 184 MPa. It is a simple vessel with elliptical heads and saddle supports. Two nozzles, close to the heads at each end. The...
  7. Russ A

    ASME VIII Div 2 Part 5 Elastic-Plastic vs. Limit Load Results

    Hi all, I seem to have found an unusual situation (from my experience anyway) whereby Elastic-Plastic results are more onerous than Limit-Load and only slightly better than ASME VIII Div 1 hand calcs. I am using ANSYS and have tried many different solver settings, mesh etc. (and have had...

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