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Farouk Maaboudallah

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Everything posted by Farouk Maaboudallah

  1. Hi mate ! You can use for example TIE constrain to link the master surface with the slave one. Normally, in contact problem we refine the mesh of the slave surface. But I think in your case, linear static analysis, there will be not so much difference. You can use the automatic mesher and mesh the parts using Tetra approximation. It's okay if you use Tetra finite element ... But in Nonlinear static analysis, we recommend to refine contact interfaces (slave surface) with S2S discretization to ensure the convergence of the contact pressure. You welcome mate
  2. Hi guys ! For the TPU 95 A material, you can model it using MATHE card. Normally, we perform an optimisation simulation in order to identify the right coefficients (we assume Neo-Hook, Odgen, ... behaviour law). And then for FEM simulation, we use what we identified (in the optimisation procedure) to run for example Tensil Simulation ... Cheers,
  3. Hi Prasannak, Thank you for your answer Yeah I now exponential, cubic laws .... The idea is for each NSET (Contact interface) we compute our own law ... For example, we assume that we want to perform contact simulation between 2 bodies (see the model below). The idea is to divide slave surface into 6 sub-surfaces and for each sub-surface we want to use a specific contact law (house development). Best regards,
  4. Hi everybody, There is someone here who has tried to implement (code) new contact laws in OptiStruct ? Best regards, Farouk M,
  5. hey look at this tutorial : https://connect.altair.com/CP/SA/hwhelp/2019.1/os/topics/solvers/os/node_to_surface_vs_surface_to_surface_contact_r-1.htm#node_to_surface_vs_surface_to_surface_contact_r cheers
  6. Hi Mayur, Can you please send me this presentation or other documentation about acoustic simulation ? Cheers,
  7. Hi, Normally, we use the same criteria for each solver ... Just be sure that you plot stress in Gauss point or ... Cheers,
  8. Thanks mate for your answer Another and the last question : There is an option in OptiStruct to implement, let's say, new finite element formulation or modify the formulation of the element ... ? (like development module in Abaqus) If yes, can you please send me the documentation ? Thank you again and have a nice weekend
  9. The idea is to perform macro-scale contact simulation (Non linear static analysis) with smooth surface that include roughness
  10. Hi everyone, Anyone here working on the modelling of the roughness / wear on macro-scale FEM model ? Best regards, Farouk
  11. To be sure : I repeated the same simulation. Instead of using 0.1 I used 0.05 and it worked well ... Please keep me in touch.
  12. Thank you for your answer What do you mean by ASD* ? Yeah sure. Im just asking in order to learn from you. Thank you again
  13. Hi Young, It's weird. I ran a non linear static simulation (frictional contact model). I used this configuration (for NLADAPT, NLOUT and NLPARM respectively) : and It worked well ... If it's not confidential, can you please share your model or verify the time increment story in simple model than you can share it ? Best regards,
  14. Hi, I opened your model. Your master ELSET is empty (there is 0 element) : I have a question for you : Why are you using Linear Static step ? Why not Non Linear Quasi-Static ? Best regards,
  15. Hi Rex, For curiosity, why you want to perform fatigue simulation in frequency domain ? Best regards,
  16. I forgot ! for the model you can start from the page 167
  17. Hey There a good book provided by Altair. Inc. You can find the basic of what you're doing. You can find as well the model described in details ... Cheers, Introduction_to_Nonlinear_Finite_Element_Analysis_using_Optistruct-Altair_University_(2018).pdf
  18. Hi Shivani, Normally in high frequency you should use SEA (Statistical Energy Analysis). The method is particularly well suited for predicting responses at higher frequencies.
  19. Hi Geraldo, I joined a paper in which we explain some Fast FRS development. Cheers, Kim_et_al-2007-International_Journal_for_Numerical_Methods_in_Engineering.pdf
  20. Hi Geraldo, FASTFR : This option is used to activate "The faster modal solution method" for modal frequency response analysis ! FFRS : The second means FAST Frequency Response Solver, used if you want to activate the external FASTFRS solver. This solver works well for a large modal frequency response. (You have to install it in advance). FFRSNCPU : used with FFRS. It's useful if you want to define the number of CPUs to be used by the external solver "FAST Frequency Response Solver". FFRSLFREQ : It's a threshold (cut-off frequency) used to partition your system into low freq and high freq. Cheers,
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