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FaroukM last won the day on May 12

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About FaroukM

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    Non Linear Static Analysis, Complex Eigenvalues Analysis, Modal Analysis, Transient Analysis, Stochastic meta model
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  1. Hi all, Has anyone among you ever encountered this error?
  2. It could be also a units problem ...
  3. Maybe the stiffness matrix is not stable if you use MAT9. Maybe be you are constraining the nodes where you apply load ...
  4. Hey Veeshal, Do you have any problem with this type of simulation ?
  5. Hi all, I'm performing simulation in order to predict the dynamic instabilities for a reduced brake system (see brsq.fem in altair documentation). As recommended in the documentation, I applied an SPC to generate a rotation of the rotor but the problem is : SPC modifies the stiffness of the system and hence, the eigenvalues .... In abaqus, they use *MOTION, ROTATION (it's a rigid body rotation) to generate the rotation of the disc. The *MOTION gives a reasonable results since the stiffness of the system remains impact by the rotation. For the next step, I want to apply a rigid body motion in optistruct (the same as abaqus). Is there the equivalent of *MOTION in OptiStruct ? Thanks,
  6. Yes and It depends on your FE model (I mean the number of DOFs should be higher ...) When you perform a FE simulation with X solver. It highly recommended to use 2 folders : - The main folder : where you will find the results of the simulation (*out file if you use optistruct). - The scratch or temp folder : where the solver write things to solver your problem. Here is an example : #!/bin/bash module load altair/2019 cd ${PBS_O_WORKDIR} optistruct Job1.fem -ddm -np 4 -nt 4 -core IN -minlen 10000 -scr /scratch/beegfs/RunTime
  7. I think it's an interesting alternative to reduce the computational cost if you use scratch folder on SSD drive.
  8. The normal contact stresses are always here when you solve a frictionless contact problem.
  9. Hi, Normally, you should find the *fem file in your work directory. If yes, you can import it through HyperMesh and then find what are you looking for. Cheers,
  10. Hi, - SPC is an abbreviation of Single-Point Constrained. With a SPC you can define a sets or only a Single-Point that will be constrained. For example, in linear or non linear static analysis, you can use it to apply an enforced displacement, for thermal analysis you can use it to define a temperature BC ... - SPCD is general, in addition to an enforced displacement (valid in static analysis), you can define velocity or acceleration for dynamic analysis. You can also use it to define an amplitude for a dynamic load. - Solving the contact problem mean find the contact pressure and hence, the stress and strain .... Cheers,
  11. Hi Gabriele, What do you mean by stress linearization ? Best regards,
  12. You can try to activate the tangential component of the contact force by adding friction in CGAP property ...
  13. Hi Ossen, I ran your model but I don't understand what's the problem ? Can you please more :) Best regards,
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