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    • Rahul Ponginan

      Please click here for a short but important announcement   03/26/17

      Dear Users Our Commercial and Academic users around the world can use these same forums here as before i.e. the Altair Support Forum , Commercial users from India with solver queries can go to the Solver Forum for India Commercial Users , Academic Users from India and AOC India Participants are requested to go to the Forum for India Academic Users and AOC India Participants , We will be tending to all queries in all the forums promptly as before, thank you for your understanding. 
    • Rahul Ponginan

      ユーザーフォーラムについて   10/22/17

      アルテアエンジニアリングでは、弊社製品や技術について、ユーザー様同士がオンラインで情報交換できる場所を提供しています。 日常業務の中で起こるさまざまな問題の解決や、他ユーザー様との技術交流を図るための場として、お客様の環境に合わせてご活用ください。

George P Johnson

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Everything posted by George P Johnson

  1. Modeling technique to connect 2D element to 1D element

    Hi Richard, For the beam you have selected thinwalled box as standard section type. Can you confirm whether you want the same section?.
  2. missing normal termination

    Hi Shawoon, This is a generalized case, can you share the model file so that we can review and can fix the issue.
  3. Strain analysis in radioss

    Hi Surya, Can you try with /ANIM/SHELL/TENS/STRAIN/ALL for shell elements and /ANIM/BRICK/TENS/STRAIN/ALL. Also, create an output block for those elements from which you will get various strain results. Please go through /TH/SHEL in the Help Menu for various outputs available.
  4. dynamic crash analysis, one solver file generated

    Hi, This issue is because of the unit consistency in the model. I changed the unit consistency to Tonnes,mm, seconds and it's running fine. The normal unit consistency followed with example values is attached along for your reference. The model file is also attached for your reference. complete_deck_0000.rad
  5. Error while applying concentrated load

    Hi Ushay, From the out file we can check for any warnings/errors listed and from the engine out we need to check the error trapped during the run. No model info will be available from the out files, and so please share thereby we can suggest some workarounds.
  6. Error while applying concentrated load

    Hi Ushay, Can you please share the starter out (_0000.out) and engine out (_0001.out) files.
  7. ERROR

    Hi Pavan, Please check the model for any penetrations/intersections in the contact. Moreover the mass error (dm/m) also seems to be high and it is always recommended to be less than .03.
  8. Create RBE2 on Local Coordinate System

    Hi, The RBE 2 follows the displacement coordinate system of the node. In HyperMesh, from the assign subpanel of the Analysis> >Systems panel select the nodes, select the coordinate system and set displacement, so that system assigned to the dependent system will move correspondingly.
  9. Mr.

    Hi, Once the 3D elements are isolated from the mask browser go to delete panel and select elements>>displayed option so that they will be deleted. The above .swf fie has been converted to .mp4 and attached along for your reference. Mask_browser.mp4
  10. Mr.

    Hi, With screen capture the above video was captured and the .swf can be opened in GOM player. Please remesh the model you have shared. You can extract the faces (Tools>>Faces) of the model so that 2D mesh will be created. Now from mask browser isolate the 3D elements and delete the same. Unmask and remesh the existing 2D mesh to the required element size and using line drag option you can create the hexa mesh of the remeshed elements.
  11. Python post-processing T01 file

    Hi Robbin, I am not clear about the query, can you please elaborate? If you are asking about the T01 variables available, then from the Help menu you will get all the details on the available output request in T01 file. Please search in Help for /TH which will list all the time history output variables.
  12. What's the main difference between /mat/law38 and /mat/law70?

    Hi Roy, It's not yet released. I'll keep you updated on this.
  13. MAT LAW 36 - PLAS TAB

    Hi Subhu, The curve for /MAT/LAW36 is defined from the post yield criteria, that is from the yield point only the curve is defined. So only the plastic strain values are there in the curve.
  14. RADIOSS IMPLICIT STOPPED DUE TO TIMESTEP LIMIT ** ISTOP=-2

    Hi Karthic, I doubt with the loading type used. Can you try with /IMPDISP instead of /CLOAD. Can you try with explicit formulation, as implicit solution is RADIOSS is more to complement the explicit Solution. So we suggest to use it only for specific cases like Spring Back.
  15. Guarantee mesh continuity between two solid bodies

    Hi, Using replace panel or using free edges panel user has to equivalence the nodes thereby connectivity can be maintained. I recommend you to go through Practical Aspects of Finite Element Simulation (A Study Guide) ebook where this concept is covered (from page 248 onwards). Also, please go through https://www.youtube.com/watch?v=aktDBNgb1-w (4 video parts are available) where maintaining connectivity is shown.
  16. Regarding tensile test simulation

    Hello Pavan, From the T01 file select the element for plotting the stress and strain curve. Else, from HyperView also you can plot this using Build Plots menu. Once these plots are done using cross plot option you can create stress-strain curve. I'm attaching two documents where cross plotting is shown. Please follow the steps shown in these documents to create a cross plot. Cross plot values along a specified node path (1).pdf Cross_Plot.pdf
  17. dynamic crash analysis, one solver file generated

    Hi, There could be several reasons for the engine crash. Please check the contacts in the model for any penetrations or intersections. Please share the starter out (_0000.out) and engine file (_0001.rad) files. Also what unit system are you following for this model?.
  18. Mr.

    Hi, Still in the model you have both shell and solid mesh, ie 2D and 3D elements in the same component collector. From the mask browser you can hide 2D elements and view the 3D elements only. Hide the 2D and delete the 3D mesh (fine mesh elements) and display the 2D elements and create the hexa mesh from them and run the analysis. Masking the 3D /2D elements from the mask browser is shown in the video below. Please follow the steps shown. PS: You can always ask queries, even if they are simple. We are always happy to help you. mask_browser.swf
  19. Segmentation error

    Hi Suraj, Delete your settings files from the working directory for solving this issue. The below post shows the procedure for deleting the settings files. Normally when the application closes with segmentation error the file will be saved in working directory but we always recommend to save your work at regular intervals.
  20. Mr.

    Hi, From the model delete the fine mesh and keep only the coarser mesh. Update the loads and boundary conditions in the coarser mesh and try running.
  21. Mr.

    Hi, For a coarser type, mesh the component with a bigger element size and finally go to 3D page>>order change and select the elements and change to 2nd for second order elements.
  22. Mr.

    Hi, There were shell elements in the model and the same was deleted. Now the model runs fine. The current mesh looks good. try_3_final_original_coarse_2nd.hm
  23. ERROR

    Hi Pavan, This is the energy error parameter, which is shown in percentage. The energy error percentage is the parameter that checks the energy conservation during each numerical cycle . If the energy error is negative it means that some energy has been dissipated.Normally the energy error should be less than 15% at the end of computation but if the model undergoes high plastic deformation the energy error can increase. As of now the energy error looks fine in your model and I recommend you to continue the run.
  24. RADIOSS IMPLICIT STOPPED DUE TO TIMESTEP LIMIT ** ISTOP=-2

    Hi Karthic, The Riks type arc-length method is suitable for nonlinear static analysis of unstable problems like buckling, snap-through. I recommend you to go through /IMPL/DT/3 in Help Menu where this is described.
  25. Hi Andrey, f2 and S0 are concrete confined strength ratio and concrete confined stress ratio respectively. For a confined concrete behavior the strength and stress may vary from the traditional values and those we are specifying here. Dsup and Epsmax are damage/failure parameters. The material will fail when these parameters are reached. Similarly other parameters mentioned are described in Help menu. If you are looking only for a brittle material law, please go through /MAT/LAW27 in Help Menu, which is an elasto-plastic Johnson-Cook material model with an brittle failure model.
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