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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. 


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Showing most liked content since 12/18/17 in all areas

  1. 2 likes
    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
  2. 1 like
    I am looking into this. i will get back to you as soon as possible. Thankyou
  3. 1 like
  4. 1 like
    1- depends on your analysis type, if you are simulating vehicle crash, you should make mesh size equally 2- if you cannot make ideal model, just expand quality thresholds example warpage up to 10Deg, jacobian down to 0.5 . If you don't know how much quality is good => let hm default values are your choice.
  5. 1 like
    Hi, We can restart a run in RADIOSS. Please go through this video which shows the procedure: https://altairuniversity.com/learning-library/5-procedure-to-restart-a-radioss-run/
  6. 1 like
    Hi Ivan, For cyclic symmetry in RADIOSS we have a workaround. Select the nodes where you apply the boundary conditions, and put imposed displacement (/IMPDISP, and keep icoor=1)load on those nodes with zero magnitude function in the required directions. X Y 0 0 1 0
  7. 1 like
    Hi! I have implemented typ 16 property for a fabric material and now creating a material card from tensile test results. I am a bit confused of the ref vector in the property card. I understand, if Vx =1 the direction of fiber is aligned with global X-axis, but how will it assign the x-axis of fiber to global axis? What happens with the other cases, if vx=0 ; vy=1; vz=0 vx=1; vy=1;vz=0 I have performed the tens. test by having a fabric(warp, weft fibers separated 90deg) whose warp and weft are parallel and perpendicular respectively to the loading direction. Any answers regarding this are highly appreciable. Thanks in advance
  8. 1 like
    Hi Sebastian, Did you try with /ANIM/VECT/CONT2, which will generate animation files for tied interface forces. /ANIM/VECT/CONT will generate animatioon files for contact forces.
  9. 1 like
    Hi, You cannot run the simulation in Student Edition due to the node restriction. If you have a full license you can save from Student Edition and can run the same in full license. I would recommend you to try to model this load in the ship as mass. You can apply the same using ADMAS. There is no other go, you may have to run several iterations to find the speed.
  10. 1 like
    Hi, This seems like the time step of the model is decreasing and so the run time is increasing. Check the model for any penetrations/intersections which could result in time step drop. From the engine out (_0001.out) file check which object is responsible for the low time step. It can be an element, a node or an interface. For an element, check the related material.There must not be an error in the units system that this data is given in. check the element size also For a node, check the characteristics of connected elements. If the node is on the master side or the slave side of an interface, this interface must be verified. For an interface, the gap of the interface must be verified if some failure happens on the master or the slave side of the interface
  11. 1 like
    F2>delete>solids to delete all solids then you can select the surfaces manually
  12. 1 like
    Hi, Check the imposed time step in the model. It seem likes the imposed time step value is very high. Reduce the value and try running again.
  13. 1 like
    Hi Harsh, Instead of making the whole cap component as rigid, create a rigid on the top surface of the cap and impose the load on master node of the rigid body. Please try with this.
  14. 1 like
    Hi Arul, To make a component rigid, select rigids from 1D panel and select the component or elements to wish to make rigid. Create a separate component collector for rigids and assign no card image, no material and property for the same. You can apply loads on the master node of the rigid body. From Utility menu, select RBODY manager and you can see the rigid body created and also the master node id. While creating the load either enter this node id or directly select the master node of the rigid body.
  15. 1 like
    This template may help (run by command *usercheck spcd.tpl spcdout.csv 0) file spcd.tpl: *loads(3,2,"SPCD") *format() *string("SPCD,") *field(integer,collector.id,0) *string(",") *field(integer,location.id,0) *if([comp1!=-999999.0]) *string(",1,") *field(real,comp1,8) *end() *endif() *if([comp2!=-999999.0]) *string(",2,") *field(real,comp2,8) *end() *endif() *if([comp3!=-999999.0]) *string(",3,") *field(real,comp3,8) *end() *endif() *if([comp4!=-999999.0]) *string(",4,") *field(real,comp4,8) *end() *endif() *if([comp5!=-999999.0]) *string(",5,") *field(real,comp5,8) *end() *endif() *if([comp6!=-999999.0]) *string(",6,") *field(real,comp6,8) *end() *endif() *output()
  16. 1 like
    Hi Ivan, I doubt whether we can output contact forces/pressures and strains for plane strain analysis. I'll check regarding this and will update you. The element distortion happening results in negative volume. the high imposed displacement in the node distorts the element. You can try ramping the load. Normally starting from a zero load, and zero solution, 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. You can try with Isolid=17, which has full integration formulation.
  17. 1 like
    Hi Ivan, Please with the model file attached. model_0000.rad
  18. 1 like
    Hi, I don't think they are equivalent since two elements share one node. As a workaround you can try this: If you have the pressure value calculate the force (F) from it (F/A) and apply it equally to all the nodes in that surface.I feel that the values will be somewhat closer. You can just try this.
  19. 1 like
    Hi, Disable the analysis flag (Analysis>>Control Cards>>Analysis Flags) and try running the file. Also update the element types (2D>>elem types).
  20. 1 like
    If the stress is very "local", found in very small area, it's purely NUMERICAL, NO PHYSICAL. You can ignore.
  21. 1 like
    hello, thanks for sharing the additional detail. I think that your original approach was correct - using general networks. Simulate the S-parameters for the terminal geometry, export the touchstone file and use this in a general network connected to the wires for the simulation with the plane wave. have a look at the Examples guide for a similar workflow: E-4 Subdividing a model using non-radiating networks
  22. 1 like
    Hi @oussama1 to clarify my understanding of your question - what is the incident waves that you refer to, is the circuit exposed to an external plane wave source? It might help if you attach the .cfx file.
  23. 1 like
    Hi Roy, From this they have developed that excel sheet with the formula. I recommend you to go through the open web resources on Johnson-Cook material parameters.
  24. 1 like
    Hello Sharan, We are also happy to have you join our Forum. In HyperMesh-Abaqus user profile you can directly select the card image as Gasket_Material for the material card and can enter the material parameters. If you have queries about the material parameters I recommend you get in touch with the Abaqus support team or refer their manual. In this portal we only support Altair suites. I would like to also introduce RADIOSS which is the explicit solver of Altair and we have a gasket tutorial available in Help menu which was done in RADIOSS. You can go through the same where we have used a hyperelastic material. I'm attaching the same for your reference. RD-33599.pdf Thank You.
  25. 1 like
    Hi, Please try with the attached file. The issue was related with the surface segment created. cap_0000.rad
  26. 1 like
    Hi Conversion of structural damping to viscous damping will be purely based on the frequency interest, for that you may run normal mode analysis prior to dynamic analysis. while specifying frequency of interest in PARAM,W3 make sure frequency unit is radian per time.
  27. 1 like
    Hi Kin Poh, with /ANIM/SHELL/TENS/STRESS/ALL and /ANIM/SHELL/TENS/STRAIN/ALL keywords we can output the stress and strain for all plies in the composite material. Did you provide any failure cards for the composite (like /FAIL/LAD_DAMA, which describes the Ladeveze failure model for delamination (interlaminar fracture)). If so, you can input /ANIM/SHELL/IPLY/MAXDA, /ANIM/SHELL/IPLY/DAM keywords in the engine file for extracting damage parameters.
  28. 1 like
    Hi Kin Poh, From Analysis page, create output block for each part. And finally after the run plot the hourglass energy in HyperGraph using the T01 file generated. Please go through this video series below which is a webinar on RADIOSS and Chapter 6 covers creating output block in RADIOSS. https://www.youtube.com/watch?v=1BnhOzRVkEQ&index=6&t=3s&list=PLQ7KUGFuVz4u5y3SvIEIU07427-gATaG6 If you still have doubts please let us know so that we can create a short video on the same.
  29. 1 like
    Hi, Please find the file. rev_joint.hm
  30. 1 like
    Hi, I just modified the contact parameters and also the SPH particle parameters. Please go through the model. A similar tutorial/webinar is available which can be accessed at https://altairuniversity.com/conceptual-design-of-a-3-wheeler-motorbike/conceptual-design-of-a-3-wheeler-motorbike-tank-drop-simulation/
  31. 1 like
    Hi, Please try with the attached file. drop_0000.rad drop.h3d
  32. 1 like
    Hi, As mentioned before there could be several reasons for high energy error and this could be related to contact. You can check this using the penetration check tool in HyperMesh.
  33. 1 like
    I'm glad you found a solution. It is a rather interesting solution - it doesn't make sense to me, but I'm glad it works for you.
  34. 1 like
    I don't think I have ever heard of something like this. The best suggestion I have is that you provide the model so that we can take a look.
  35. 1 like
    Hello mustaphos, Is the variable used to define a medium? Are you able to provide the model so that we can take a look?
  36. 1 like
    Hi mustaphos This information is contained in Section 20-6 of the FEKO User Manual. This can be found by clicking "FEKO Help" under the Help menu in CADFEKO or (as a PDF document - UserManual.pdf) located in the doc folder of your FEKO installation. Specifically the total gain is given by Equation 20-14. Regards, Johan H
  37. 1 like
    Mathematically, just compute dot product of two vectors.
  38. 1 like
    Hi: How I can calculate the load I have to apply to Dload 1 and Dload 2 for the Random response analysis? And What is the Critical damping ratio value recommended for a range of vibrations at 20 from 2000 HZ? I want analyse a cubesat. Someone can help me? Kind regards
  39. 1 like
    Hi, This out file seems ok. But the mass added is high. Ideally the mass error should be less than 5%, that is .05. Reduce the imposed time step value in the engine file.
  40. 1 like
    Hello, Please go to "Tools" page "Organize" panel and select the contact as element. Then from the drop-down select "dest group" and click Move. Hope this helps. Thanyou
  41. 1 like
    Hi @Merula This sounds interesting. I am going to try this and I will update you soon.
  42. 1 like
    HI, the logfile output in ProMan can be activated under Settings => Global Settings => Computation tab. The information includes start and end time, but no information about the used RAM. The memory requirement depends typically on the size of the used scenario database (idb/idi/odb(oib/tdb). Especially in case of using preprocessed IRT databases (idi/oib) for indoor/urban scenarios the memory usage can get quite high. Here it is recommended to provide RAM size with more than factor 2 compared to the idi/oib file size. Otherwise the computation times will get very long because of swapping.
  43. 1 like
    Hi, A joint is used to allow for a relative movement between components. If the purpose is only to transfer loads then you model with connectors or rigids for that.
  44. 1 like
    Hi. I made an antenna with Antenna Magus and get *.cfx file from it. I exported it for FEKO. When i open this file with FEKO its OK and working as it should. But when i try to import this file from a CADFEKO project, i get this error: Critical Error CADFEKO 2017.2.4-315226 (x64) src\cf_ProjectAutomation.cpp (117): Assertion failed: 0 And FEKO immediately close itself. I want to simulate multiple antennas so i need to import several of them in one project so it must be imported, not open with CADFEKO. How can i do this?
  45. 1 like
    Hi, In smooth option for solid elements it adjusts the positions of the free nodes of the selected solid elements to smooth out variations in element quality and size. The smooth option's algorithm adjust node positions to moderate quality. The largest displacement on final iteration value shows the maximum displacement happened for the free nodes in the model during this operation. Attaching a tutorial which shows smooth operation in HyperMesh. Please go through the same. HM-3130.pdf
  46. 1 like
    Hi, Please find the video recording of the same. Hope it helps. Plane_Strain.swf
  47. 1 like
    Hello that's me again After a fully integration of the tires in my model I managed to make some simulations on road thanks to the .rdf file (flat and polyline roads). Now I would like to create more complicated roads. I saw that we can create 3D roads with Open CRG and I would like to know how can we add this kind of road in the model ? I didn't find specific information about this in the User Guide. Also what is the point of the Road Builder (Vehicle Tools ==> Road Tools) ? Is this where we have to import our CRG model ? Thanks for the replies !
  48. 1 like
    Go to Geom > nodes Click on "As node" option and then click on the node
  49. 1 like
    Hi, You can use circular clipping pattern to pick elements of circle.You can activate same using shift+mouse button left hold for 2 second. See attached thumbnail. Regards Rahul R
  50. 1 like
    STL files can be imported into HyperMesh, You need to use File > Import > File type > STL and then choose the file. Once the STL file has been imported you can then use Geom > surfaces from FE and select the highest complexity in this panel > select the elements to create surfaces from STL, hence you can create geometry from stl. To directly solid mesh your STL use ShrinkWrap You can achieve a good tetramesh for all purposes, using the Shrink Wrap panel. The shrink wrap can generally be used as a quick mechanism to generate solid meshes. 1. Go to 2D > Shrink Wrap panel. 2. Here there is an option generate solid mesh – this will produce an all-hexa or all-tetra mesh based on the selected elements or geometry. 3. Make sure the generate solid mesh checkbox is active 4. This will expose a tet collapse input, please try several input values depending on your quality requirements.