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  1. shiraz883

    ASME vs EN 13445| EN 12953 | Allowable stress for EN materials in ASME Sec II part D (Metric)

    Yes that's right, I intend to do that but just wanted some inputs if someone has already gone that path then it gives some kind of information where to look and what to expect. Neverthless, I found out about the codes and the thickness comes to be same for both the codes EN13445 vs EN12953 for...
  2. shiraz883

    ASME vs EN 13445| EN 12953 | Allowable stress for EN materials in ASME Sec II part D (Metric)

    Hi, I am designing a pressure vessel (waste heat boiler) with EN code - EN12953 and flexible tubesheet design to be verified by FEA using EN code 13445. Few questions: 1. For design by rule - for shell thickness - I am using PVelite but it has built in EN13445 code not EN12953. Is there a...
  3. shiraz883

    Same thermal conditions | stresses increase | primary plus secondary

    Let me rephrase: There are two load cases acting in an assembly (with sub parts of same material) which I am analyzing. The FE model is same in both cases - no change in loads, boundary conditions etc.: Load case 1. P+D (Pressure + deadweight) - temperature is applied so that material...
  4. shiraz883

    Different results in ANSYS 2021 vs ANSYS 2022

    Hi, I am running a static 2d axisymmetric analysis in different versions of Ansys and getting different results wrt deformation and stresses although everything is the same - model, boundary conditions, loads etc. I am using APDL for the analysis. Just for information a legacy element BEAM 3...
  5. shiraz883

    Same thermal conditions | stresses increase | primary plus secondary

    Hi, I am doing an evaluation with the thermal conditions (expansion coefficient) on - same temperature for the whole assembly - and other without thermal conditions - meaning that a constant temperature is given in both load cases, but thermal expansions are off (using APDL snippet) in the...
  6. shiraz883

    Stresses increase on adding thermal boundary conditions/ thermal load

    Hi, I am doing an evaluation with the thermal conditions (expansion coefficient on)- same temperature for the whole assembly - and without thermal conditions - meaning that the temperature is given but thermal expansions are off (using APDL snippet. When I see the equivalent stress for the...
  7. shiraz883

    ASME Sec VII Div.2 part Structural discontinuity | Global plastic collapse | Elastic stress analysis

    HI TGS4, I missed the limit on the Pl+Pb+Q as max of (3s or 2Sy) and you are right in stating that this is for ratcheting assessment wherein the stress range should be taken into acocunt and so also for the fatigue. And that is what I have done. But my question was regarding the satisfaction...
  8. shiraz883

    ASME Sec VII Div.2 part Structural discontinuity | Global plastic collapse | Elastic stress analysis

    HI, I have a flexible tubesheet forging for which I am evaluating the stresses on the small fillet radii region of the forging to satisfy the global plastic collapse as per ASME Sec VIII Div 2 part 5 I have made SCL's on the part as shown. The red marked portions of the forging will have...
  9. shiraz883

    ASME 5.3.2 | Local failure criteria | negative value of sum of principal stresses

    HI, If the sum of principal stresses is coming to be negative (considering principal stresses with their respective signs "+ or -") and if this negative value magnitude i.e., absolute value is greater than the limit of 4S, will the local failure criteria be satisfied or not? The code does not...
  10. shiraz883

    Weld Stress Analysis

    Hi Gowrath, Which version of Ansys are you using? I believe you have modeled the weld using the connecting edges whereby Ansys created a weld - user has to input the length and size of weld. I see that your second/third plot shows a predominant blue region which is of the order of 3 MPa which...
  11. shiraz883

    ASME 2021 edition Section VIII Div.2 part 5 | Local failure criteria - elastic analysis

    Hi TGS4, I was being lazy to calculate at several points the linearized principal stresses. Hence I thought just giving a user defined formulae will suffice. Another point, When I see the user defined formula and plot the stress using this function (s1+s2+s3) I get a plot with minimum value...
  12. shiraz883

    ASME 2021 edition Section VIII Div.2 part 5 | Local failure criteria - elastic analysis

    Hi, Instead of evaluating the algebraic sum of 3 linearized principal stresses to be less than 4S, if the algebraic sum of 3 principal stresses (not linearized)is calculated using a user defined formula in ANSYS WB i.e. s1+s2+s3 - and found to be less than 4S, is it safe to say that the...
  13. shiraz883

    Nodal forces and Von-mises stress

    Hi, I am trying to analyze welds in ansys by modeling the weld as couplings (in a shell model) and postprocessing the data in an excel file to calculate stresses in the weld In the post processing, I select each node (from a set of coupling having 2 nodes, I select one node) and write out the...
  14. shiraz883

    thread569-256835 Is there any loop

    Hi Kris, yes there are looping options "*do" loop and *get command to get the real constant and you can increment it and get required output. See the *get command help Shiraz Sr. Engineer
  15. shiraz883

    Weld post processing using Fsum/PRNLD command on coupled nodes (cpintf)

    Hi, I am trying to find the weld stresses (weld shear and weld tension) using the forces output in 3 -directions (Fx, Fy and Fz) using FSUM/PRNLD command in Ansys post-processing. The mesh (SHELL281, 8 noded quadratic elements) is uniform in size (=10mm) across the model and the weld is...
  16. shiraz883

    Ansys eigen value buckling analysis | ASME Section VIII Div 2 part 5

    HI, I am doing an eigen value buckling analysis using ansys workbench. The FE model is 166° and not 180° (due to some assumptions). The prestress is the elastic evaluation with primary loads (pressure and deadweight). Will the multiplier from the 166° model be equivalent to the 360° model...
  17. shiraz883

    ASME Section VIII Div.2 elastic and elastic plastic

    Hi TGS4, Firstly, I see that the limit on local primary membrane stress is SPL which is large of the two quantities 1) 1.5*S 2) Sy, except that (1) shall be used if ratio of min. Ys to min. Su exceeds 0.7 or value of S is governed by time dependent properties. In my case, material is SS316L...
  18. shiraz883

    ASME Section VII Div.2 part 5 | Elastic plastic analysis | Table 5.5

    Thank you IdanPV and TGS4 for the confirmation. Shiraz Sr. Engineer
  19. shiraz883

    ASME Section VII Div.2 part 5 | Elastic plastic analysis | Table 5.5

    Hi, In an elastic-plastic analysis, the required factored load combinations from table 5.5 of ASME Sec VIII Div2 part 5, the table has temperature (T) as one of the load cases in a load case combination e.g. 0.88*beta*(P+Ps+D+T). So, when factoring the temperature, I have used the factor on...
  20. shiraz883

    ASME Section VIII Div.2 elastic and elastic plastic

    Hi, I have run an elastic analysis where the stresses were over the allowable stress values at some local zones (where local membrane > 1.5S). So, in order to see whether these stresses redistribute when yielding occurs I have gone for an elastic plastic analysis using the ANSYS plugin ASME...

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