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Rahul R

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Everything posted by Rahul R

  1. Please refer attached document to perform vibration fatigue using OptiStruct. Vibration Fatigue.zip
  2. Please refer chapter 13 of the ebook.Or simply search with keyword as bracket in the pdf.
  3. Second approach with RBE2 fixed with all dof is recommended.Please request FEA ebook using below link.In page no 386 of ebook we talk about bracket analysis with and without rigid element. https://altairuniversity.com/free-ebooks-2/free-ebook-practical-aspects-of-finite-element-simulation-a-study-guide/
  4. Is that a free size with composite or simple size optimization?
  5. You can check FEA reanalysis , which is available for topology and topography optimization. Reanalysis.pdf
  6. Please read the comment section of QVOL card. In MAT4 & MAT5 we can specify HGEN. QVOL.pdf
  7. Change order to second with toggle button set to midside node projected to surface option.
  8. Basically if you have the hostnames in a hostfile.txt: optistruct input.fem –hostfile ./hostfile.txt [-np <NUMBER OF MPI PROCESSES>] [-mpi <i|pl>] The input files must be available from all nodes in the same path. This can be done by copying the input files to identical paths on all nodes or mount the folder containing the input files to all nodes. Scratch files ought to be written to local high performance disk on each node. Please check advanced installation guide for more details. Advanced_installation_guide.pdf
  9. Please refer the document shared in below post.
  10. Can you also share the .out file of the run?
  11. Rahul R


    It seems you too are using the version 2017.2 with modal FFR. Updating solver version should help to continue run.
  12. Altair OptiStruct 2017.2.3 provides Corner option for composite stres.CSTRESS(corner) is only supported for linear static analysis.H3D is the only supported format.
  13. Linear is for linear static /Modal is Normal modes analysis/Transient is for Dynamic,crash & nonlinear transient analysis.
  14. Rahul R


    Sorry I yet to take a look. I will check and let you know. Meanwhile you can refer below post where user had similar question. https://forum.altair.com/topic/31244-acoustic-infinite-elements/
  15. Please check for mesh pull down menu> cleanup element> smooth option Check video for (Meshing:Improve Element Quality with Smoothing) Altair for Aerospace Learning Center
  16. Latest version of HyperMesh 2019.0 provides Tetramesh updates for geometry modification. Please refer attached video. Tetramesh_updates_for_geometry_modification.mp4 05_Bottle_Tetra_Update.hm
  17. Automatic time-stepping is activated in your case. Please check the output section of attached document from online help. Nonlinear_Direct_Transient_Analysis.pdf
  18. Please refer attached document on Laminate Failure Theories in OptiStruct. Laminate Failure Theories in OptiStruct.pdf
  19. Can you share the screenshot of both the cases(with RBE2 and without RBE2 )?
  20. Contact stabilization energy should not be more than 15% of internal energy. Please refer video shared in below post .
  21. When a structure deforms, different regions strain by different amounts. The sum of the energy in the structure due to the deformation is called the strain energy. Contact stabilization energy curve is available from 2017.2 version. Please refer attached video for the CNTSB in ExpertNL to using the CNTSB card as load collector. https://forum.altair.com/topic/31169-strain-energy-and-cntstb-ratio/ Contact_stablization_CNTSTB.mp4
  22. TYPE = SLIDE Only valid for small sliding Only normal contact stiffness is generated TYPE = STICK No sliding once gap is closed TYPE = FREEZE Enforces zero relative motion between contact surfaces Contacts are closed at all times, no matter the distance between them Rotations on the slave patch are matched to the rotations of the master patch (LGDISP)
  23. I able to import shared stp file in HyperMesh session.What is the error you get in while importing this file?Please share the screenshot of same. You can download free ebook on external aerodynamic with virtual wind tunnel using below link. https://altairuniversity.com/free-ebook-learn-external-aerodynamics-with-virtual-wind-tunnel/
  24. Time stepping scheme selected using TMTD parameter on TSTEP card.
  25. MATF bulk data card supports multiple failure criteria PUCK, HILL, HOFFMAN, TSAI-Wu, HASHIN, or Max Strain Right now we can only calculate Composite Failure with Shell-elements and MAT1/MAT8 Materials.
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