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Farouk Maaboudallah

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    Non Linear Static Analysis, Complex Eigenvalues Analysis, Modal Analysis, Transient Analysis, Stochastic meta model
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  1. 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,
  2. Hi ! I answered you in your new post Please update me when you read it. Thank you.
  3. Hi, If you want to assign a component as a rigid body you have 2 options : - Choose Young modulus too high, - Use rigid element. Best regards, Farouk
  4. By using Fast contact you delete the movement of a rigid body. Try to run a simulation by imposing BC : for example U_x = U_y = Uz = 0, keep the Fast contact. Normally, you will eliminate all the rigid body movement. Cheers,
  5. I don't think that you have something weird .... it seems logical your results !
  6. Hey Lisa, I saw your model. I think you are running a static linear simulation. I recommend to use Non Linear Static Simulation. And create a new card (NLPARAM) in order to configurate Newton-Raphson scheme for NL anaysis. In contact prop, I would recommend to use S2S discretization. Tell me if you succeed to get what you need (results) Cheers,
  7. Ansys do this type of analysis. Abaqus as well ... For Ansys, please see the following paper : https://www.researchgate.net/publication/237566348_Methods_for_Generating_Rough_Surfaces_in_ANSYS
  8. I need it to perform simulation with the real contact surface and use the "real" contact stiffness for my application.
  9. Hi everybody Is there anyone here who has tried to model and run contact simulation using rough surface (see the picture ) ?? Cheers,
  10. Hey ! Try to add S2S DISCRET and add Contact Stab. Verify the normal of slave and master surface ... Could you please share your fem file, if it's not confidential ? Cheers !
  11. Thanks mate for your answer I have some questions : 1- *dll file represent what exactly ? Library or package for user defined material ? 2 - To define Saint Venant Kirchhof behaviour law, I should modify : +,PROPERTY,210000.0,0.4,320.0,500.0,0.0,180.0,1.2e+2 ??! Cheers !
  12. Hi everyone ! I'm trying to study large displacement of 2D model in OptiStruct in order to compare the results with our FE solver ! In my solver, I'm using Saint Venant Kirfchhof behaviour law to resolve Non-Linear Large Displacement problem. When I perform the same simulation with OptiStruct I find something weird ! Maybe it's due to behaviour law in OptiStuct ... For sure I'm using the wrong one (not SVK one). My question : Is there is a way, in OptiStruct, to write a subroutine (SVK behaviour law) ... and run the simulation using the user behaviour law (written in the subroutine) ? Best regards,
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