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Showing content with the highest reputation since 10/20/17 in all areas

  1. 3 points

    TCL script

    Hello Everyone Firstly thanks a lot Livil for all the help. Really grateful for it. Secondly, here is the file which Livil wrote, in case any one needs it in future. merged.tcl
  2. 3 points

    2D Mesh - Multibodies

    work with only 1/4 Split surface of 2nd by 1st Make 2D mesh on 1st solid (yellow) => Make 3D tet mesh for 1st solid On interface, make 2D mesh on 2nd solid => Equivalence of nodes. Make the rest of 2D mesh of 2nd solid & equivalent of nodes: Finally fill 3D tet for 2nd solid and get the final result: Here's HM model: peca.hm HTH,
  3. 2 points
    Toan Nguyen

    Node renumbering using commands

    hi, Try these commands : *createmark nodes 1 "dispalyed" *renumbersolverid nodes 1 1000 1 0 0 0 0 0. These commands will renumber ids of all displayed nodes, start from 1000 and increase by 1. You can get more detail about commands in the Help file. One more thing, next time, if you want to know a command to do a thing in HM, you can follow this method: - Go to the working directory (usually the Document folder), delete file name command.tcl. - Perform the action you wish to know its command in Tcl. - Go back to the working directory folder and open file named command.tcl The command you need will be written in this file.
  4. 2 points
    Maybe try with the newer version, like 2017?
  5. 2 points

    Check property assignment on elems

    Hi, It's simple: *displaynone *createmark elems 1 "equal to value" propertyidflag 1 *findmark elems 1 0 1 elems 0 2
  6. 2 points
    Hi, I have worked in FOAM Material using LAW 70 in one of my project. I tried validating LAW 70 for different scenarios. Attaching some sample validation case for reference. Hope it may help you. Thanks. Comp_20mm_0000.rad penetration_1DOF_0000.rad E_1100_0000.rad
  7. 2 points
    George P Johnson


    Hi Zhaoying, For /MAT/LAW36 we provide post yield values in stress-strain curve, and the elastic portion of the material is defined by the Young modulus and Poisson’s ratio. By introducing strain rates we are controlling the change in strain (deformation) of a material with respect to time. Material plasticity curves can be given for up an arbitrary number of strain rates. Based on this strain rate the speed at which deformation of an object from its original shape occurs can be controlled.
  8. 2 points
    George P Johnson


    Hi Zhaoying, You can review the node group in HyperCrash but I don't think it's possible to see the node ids of the node group in HyperCrash. I suggest you to export the model from HyperCrash, manually open the model file (_0000.rad) in Textpad and review the node group where you can see all the node ids.
  9. 2 points
    George P Johnson

    Time for simulation

    Hi, Normally starting from a zero load we gradually ramp up the load until we achieve the desired total load. This gradual ramping up the load from a value close to zero is often a more robust approach for solving nonlinear problems. And we run the simulation for this total time over which we ramped the load. Please go through https://altairuniversity.com/learning-library/7-guidelines-to-apply-quasi-static-load-in-explicit-simulation/ which are the Guidelines to apply Quasi-static Load in Explicit Simulations.
  10. 2 points
    Livil Lyle

    TCL Scripting

    Below resources will help you get started with tcl/tk programming. https://www.tutorialspoint.com/tcl-tk/ https://www.packtpub.com/networking-and-servers/tcltk-85-programming-cookbook https://www.tcl.tk/man/tcl8.5/tutorial/tcltutorial.html
  11. 2 points
    Flux support

    View Flux mesh in SimLab

    You are welcome. Yes it is possible. To do it, one the project is solved: In data exchange, select export quantity and after select export spatial quantity and formula starting from different types of supports Flux open a window (see attached PPT file) With this method you need to do the same step for each region. In the new Flux version (2018), you can do it by selecting all the region in the same file. Best regards. Mesh_Export_From_Flux.pptx
  12. 2 points
    In fact, it's not so simple to compare. In case of shell element, you have stress on upper/lower layers. But in case of solid element, the stress in general is not computed at surface. In my previous tests, I have to apply a very thin skin on solid element to capture the membrane stress which can be compared to shell stress.
  13. 2 points
    Hello Badheka, Lets start with the effect of the segment radius. For the segment radius, I would suggest that you use the radius that you need to simulate - don't make the wire infinitely thin thinking the answer is more correct for some reason. If the ratio of the radius to length become to extreme, then it is time to use a cylinder (triangles) instead of segments. What I mean by "extreme" is that the MoM segments uses a thin wire model and the approximation becomes better the longer the segment is relative to its radius (or rather, the smaller the radius for a given segment length). You can get good results even with relatively fat segments (5 to 1 ratio). FEKO will give a warning and eventually an error if the segments are too think compared to the segment length. Your main question was about the effect of creating too long or too short segments. Obviously if you make the segments too short, the segment length to radius ratio will start violating the thin wire approximation and your results will become less accurate (see the comments in the previous paragraph). Also, increasing the number of segments by making them shorter increases the size of the model since more unknowns need to be taken into account. The CEM model is solved by breaking the model into small pieces, associating basis functions on the elements and then solving the unknown coefficients associated with the basis functions. If you mesh too coarsely (coarser than lambda/10), the results would become less accurate and at some point it would simply be incorrect. FEKO will give a warning and later an error when elements are meshed too coarsely. If you mesh finer and finer, the answer generally becomes more and more accurate (converge to the exact answer). There is a point where meshing finer could start diverging again. The exact behaviour depends on the solution method (MoM, FEM, etc.) and the basis functions that are being used. The comments above are very general and apply to various methods and elements (segments, triangles, tetrahedra, etc.). How do you know how fine to mesh a model? The best is to have a good starting point and the general rules are provided in the FEKO manual. It is good practice to do a mesh convergence test - the basic idea is to refine the mesh until the results converge (stop changing). Another approach is to calculate error estimates on the elements and instead of refining the entire mesh, only refine the mesh in the areas where the errors are estimated to be the largest and again continue this process until the results converge. Using the suggestions for meshing (standard and fine) should give accurate results in most cases. The coarse mesh setting is expected to give less accurate results, but faster simulations due to the model begin smaller. The optimal point depends on your model and the accuracy that you need from the simulation.
  14. 2 points

    LUA Scripting with FEKO

    Hello @mustaphos, @JIF beat me to it...! Of course, this is the "more correct" way to learn how to do scripting and automation. The shortcut way to get started with scripting (in CADFEKO) is to use "Macro recording". You'll see in the status bar (in the bottom of the application) a button with a puzzle piece and a red circle. If you press this, then CADFEKO will record every action you take that changes the model. In other words, if you start recording and create / modify / delete a variable, then a script will be recorded that shows you how to do precisely that one bit of scripting. It's cheating but I won't tell anyone.
  15. 2 points

    LUA Scripting with FEKO

    Hello mustaphos, At this point you need to have a look at the CADFEKO API. Everything you need will be under "project". I would suggest that you have a look at chapter 7.1 (Scripting basics) and in particular the example in 7.1.1. I would then suggest that you work through example I-1 in the Example guide since it walks you through the process of creating a model in CADFEKO. Reading settings from the model is the same and it is also demonstrated.
  16. 2 points

    find cog of a hole.

    hi from hm14 you can select nodes on edge in one click so just use hm_getbestcirclecenter to find cog of the nodes
  17. 2 points
    We are excited to announce the release of updated RADIOSS ebook, Introduction to Explicit Analysis using RADIOSS. We have added new tutorials, more FAQ's....etc with more topics covered. This study guide aims to provide a good introduction into the exciting and challenging world of explicit Finite Element Analysis. You can download the updated RADIOSS ebook here: Introduction to Explicit Analysis using RADIOSS We value your cooperation. If you wish to add any new RADIOSS topics in the ebook please intimate us at altairuniversity@altair.com , so that we can try to include them in the next update.
  18. 2 points
    Hi, Currently there is no options to export only element id in .txt file from element group. But we can export the element id's along with the corresponding node id's in .csv format from selected entity. Please follow below steps to get it. 1. Go to File > Export > Other > CSV 2. Give file name 3. Pick only element toggle in dialog 4. Select entity like elements / faces 5. Click Ok. Hope this will help you.
  19. 2 points
    Hi Nut, In order to fix the duplicate elements go to check elems menu (F10) >>duplicates >>save failed. Now go to delete (F2) menu select elements >>retrieve >>delete entity. This will delete the duplicate elements from the model.
  20. 2 points

    Hexa Meshing

    Your mesh looks good. But it's possible to do that better. In fact, in FEA world, we have to know where we have to ... stop to get something acceptable :-)
  21. 2 points
    George P Johnson

    import & mesh

    Hi, Open HyperMesh with Abaqus as your user profile and import the CAD file (File>Import>Geometry, select the file format (STEP/IGES) and select the CAD file). Now you can create the FE model (meshing, assign materials,properties, loads...etc) and finally you can export (File>Export>Solver Deck) for solving. Many tutorials on HyperMesh - Abaqus interface are available in the Help and I recommend you to go through.
  22. 2 points

    AcuSolve Motionsolve cosimulation

    Dear All, Both AcuSolve (CFD) and MotionSolve (MBD) Hyperworks Solvers can be coupled, cosimulation is possible. Certain Applications being real time Aerodynamics simulations, Wind turbines, Fuel tank sloshing, Pressure check valve etc. Click here to view the webinar on AcuSolve (CFD) & Motionsolve (MBD) coupling Attached is a tutorial on the same coupling - Pressure check valve. Regards, Kamlesh CFD_MBD.zip
  23. 2 points
    George P Johnson

    Tensile Test MAT25

    Hi, By creating time history output for elements it is possible to output stress and strain for the elements. Go to Analysis>Output Block> elements, select elements. Card edit the created output block and change the keyword accordingly. Use DEF keywprd to output the default outputs. Please go through the Help Menu on Output Blocks which describes about the various outputs available in Time History. Also please go through ths webiniat at https://www.youtube.com/watch?v=Ef7Spn-j7fA&list=PL1u26y75SCrA_BOCLaSewVCNY7xRvCTnA&index=6 which describes about creating output blocks. Using cross plot option you can crate load-displacement curves...etc. The steps for cross plotting is shown in an example file below. Please go through the documents attached. Cross plot values along a specified node path.pdf Cross_Plot.pdf
  24. 2 points
    I suddenly found how to reverse normal of 1D Just enter panel 1D>spotweld>switch node Pick elems and "switch" An interesting function hidden in an uninterested panel !
  25. 2 points
    Rahul Ponginan

    element selection

    To select elements within a circle, Shift + Single click and release of the mouse displays the entity selection pop-up menu: From the entity selectionpop-up menu, choose one of the first six quick window selection modes: •Inside of circle selects the entities that are inside of a circle window.