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About Enrico

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  1. Enrico

    Shell elements

    Hi @Prakash Pagadala, is it possible to do the same in Radioss? I cannot find the option Enrico
  2. Enrico

    material non linearity

    Hi, I would like to include a non linear material law in a static analysis, but it looks hard to find tutorials or detailed examples. Could you help me please? Thank you so much, Enrico
  3. Enrico

    Axysimmetric analysis - AUTOSPC

    Hi Prakash, I've another question about CTAXI elements. In my analyses, I have to use a non-linear material model. However, when I run the simulation, in the .out file I read: *** WARNING # 1916 Nonlinear material(s) defined, but no elements appropriate to use them. Could you help me, please? Thanks, Enrico
  4. 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
  5. Enrico

    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
  6. Enrico

    Free size - buckling

    Here you are, Thank you so much Enrico min_mass.out
  7. Enrico

    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
  8. Enrico

    shell buckling - *** INFORMATION # 3454

    Thank you so much! Enrico
  9. Enrico

    shell buckling - *** INFORMATION # 3454

    How can update to latest solver patch? I think I have the version 2017.2
  10. Enrico

    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
  11. 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
  12. Enrico

    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
  13. Enrico

    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
  14. Enrico

    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