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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 


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  1. Geometric non linear analysis - temperature

    Is it possible in a NLGEOM?
  2. Hi, I'm modeling a stiffened sphere subjected to external pressure and to expansion due to high temperature. I performed a geometric non linear simulation considering only the external pressure and now I'd like to evaluate the effect of the high temperature. How can I include it in the analysis? I can't find nothing similar to the TEMP entry of the linear static Thanks, Enrico
  3. Free size - buckling

    With an higher number of iterations, the optimization converges, but to an unfeasible design Please find attached the .out file min_mass2.out
  4. Free size - buckling

    Here you are, Thank you so much Enrico min_mass.out
  5. Free size - buckling

    Hi, I'm working on a spherical Vacuum vessel (external pressure > internal pressure) using an isogrid structure. I made a shell model with sphere skin and additional ribs to have more stiffness and avoid buckling. Now, I'd like to perform a free-size optimization, to see if there are particular shapes and thickness distributions that minimize the mass of the system. I tried different optimization sets (min mass + constraints on buck, min compl + constr on buckling and mass), but every optimization ends with "Unfeasible design", with very large violations of buckling constraint. Could you give some hints? Thank you so much Enrico
  6. shell buckling - *** INFORMATION # 3454

    Thank you so much! Enrico
  7. shell buckling - *** INFORMATION # 3454

    How can update to latest solver patch? I think I have the version 2017.2
  8. shell buckling - *** INFORMATION # 3454

    Sorry, I can't understand Please find attached the model I'm using What is the difference with a classic buckling problem? Thanks for your patience Enrico test_ref.fem test_ref.out
  9. Hello, I'm trying to perform a linear buckling analysis on a hemisphere subjected to external pressure and constrained at the base. Running the analysis, in the .out file I find: *** INFORMATION # 3454 MPC constraints for subcase 2 will be enforced with lagrange multipliers. Could you please explain what does it mean? Thank you so much for your kindess Enrico
  10. Axysimmetric analysis - AUTOSPC

    Thanks! Aim of the study is to evaluate the stress concentration in the component visible in the figure. So, unfortunately I can't model the whole component (or one quarter only) with solid elements, because it would require too much grids
  11. Axysimmetric analysis - AUTOSPC

    Thank you However, I don't understand the local stress peaks inside the model, they are not phisical and non-negligible. Is it possible that they are related to the autospc? How to solve the problem? Thanks Enrico
  12. Axysimmetric analysis - AUTOSPC

    Hi Prakash, I saw your files, but I think that the model is not well constrained. By the way, as I can see in the output file, AUTOSPC continues locking spc 2 and, as a consequence, there are wrong stress results in the h3d file. I apologize for bothering you, but I do not know how can I solve this problem Thank you Enrico
  13. Axysimmetric analysis - AUTOSPC

    Hi @Prakash Pagadala, thank you for your kindness I tried to run the input file you kindly sent to me, but I still have the same problem (2133) I'm using Hyperworks 2017 Student edition
  14. Axysimmetric analysis - AUTOSPC

    Thank you very much, I look forward to hearing from you
  15. Axysimmetric analysis - AUTOSPC

    thank you so much!