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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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Found 251 results

  1. Load on Rigid body

    How to convert part into Rigid body ? and apply load on rigid body? Regds, Arul
  2. Hello, i am a graduate student in ITU Aeronautical Engineering(IDP). i am preparing my thesis. The issue of my Thesis is Flexible multibody analysis of a Landing Gear of a Training Plane. When i analysed the system, i need to compare the results with real test datas. i couldnt achive tests, because of time constraints and very expensive. i think that the closest results can be explicit dynmaic analysis. when i arrenged the explicit dynmaics model and run. i saw there arent any correlation between flex mbd and exp. dynamics anylsis in the same boundry conditions. Can you help me to solve this problem. i asked this question to turkish distrubuter, they get rid of me because of thier job jam. Unfortunately my deadline is very strict, i have to deliver the thesis as soon as possible. My all datas ar in the link below. The model, solved files and the video files. in this problem when the plane landed, the oleo strut make displacement 160mm. During this action observing stresses on the structure, and the 434 steel's compitability for this work. i will be happy for helping me. Thanks for everything. Best Regards. Yours sincerely.
  3. Hello, i am a graduate student in ITU Aeronautical Engineering(IDP). i am preparing my thesis. The issue of my Thesis is Flexible multibody analysis of a Landing Gear of a Training Plane. When i analysed the system, i need to compare the results with real test datas. i couldnt achive tests, because of time constraints and very expensive. i think that the closest results can be explicit dynmaic analysis. when i arrenged the explicit dynmaics model and run. i saw there arent any correlation between flex mbd and exp. dynamics anylsis in the same boundry conditions. Can you help me to solve this problem. i asked this question to turkish distrubuter, they get rid of me because of thier job jam. Unfortunately my deadline is very strict, i have to deliver the thesis as soon as possible. My all datas ar in the link below. The model, solved files and the video files. https://drive.google.com/open?id=1ftCMNjK_aZi_axSFe0Gx-3Jk6Qe33u00 in this problem when the plane landed, the oleo strut make displacement 160mm. During this action observing stresses on the structure, and the 434 steel's compitability for this work. i will be happy for helping me. Thanks for everything. Best Regards. Yours sincerely.
  4. Hello, i am a graduate student in ITU Aeronautical Engineering(IDP). i am preparing my thesis. The issue of my Thesis is Flexible multibody analysis of a Landing Gear of a Training Plane. When i analysed the system, i need to compare the results with real test datas. i couldnt achive tests, because of time constraints and very expensive. i think that the closest results can be explicit dynmaic analysis. when i arrenged the explicit dynmaics model and run. i saw there arent any correlation between flex mbd and exp. dynamics anylsis in the same boundry conditions. Can you help me to solve this problem. i asked this question to turkish distrubuter, they get rid of me because of thier job jam. Unfortunately my deadline is very strict, i have to deliver the thesis as soon as possible. My all datas ar in the link below. The model, solved files and the video files. in this problem when the plane landed, the oleo strut make displacement 160mm. During this action observing stresses on the structure, and the 434 steel's compitability for this work. i will be happy for helping me. Thanks for everything. Best Regards. Yours sincerely.
  5. Hello, I want to optimize a front end of vehicle and I have built a FE model in radioss block, and I want to use the esl method as the optimization strategy, is there any possible way to couple radioss block files with optistruct to use the esl method? Thank you!
  6. Hi, I have some test data, which is used to model Abaqus Hyperfoam material. Now I am wondering how I can translate this measured to Radioss material model ? ** MATERIALS ** *Material, name=FOAM *Density 100, *Hyperfoam, n=2, poisson=0., testdata *Simple Shear Test Data 0.014, 0.08, 0.0046 0.0334, 0.16, 0.0166 0.0533, 0.24, 0.0366 0.0853, 0.32, 0.0573 0.128, 0.4, 0.0817 0.1653, 0.48, 0.1098 0.208, 0.56, 0.1394 0.256, 0.64, 0.1666 0.2987, 0.72, 0.1904 *Uniaxial Test Data -0.0217, -0.05 -0.0317, -0.1 -0.0367, -0.15 -0.0402, -0.2 -0.0433, -0.25 -0.0467, -0.3 -0.0504, -0.35 -0.0542, -0.4 -0.0604, -0.45 -0.0668, -0.5 -0.0759, -0.55 -0.0909, -0.6 -0.1083, -0.65 -0.141, -0.7 -0.1933, -0.75 -0.2896, -0.8 Thanks and Regards, Best regards / Terveisin Petri Seppänen Leading Specialist MBS & Optimization, Technical Analysis Elomatic Oy, Vaisalantie 2-8, 02130 Espoo, FINLAND GSM:+358 50 576 5146 petri.seppanen@elomatic.com
  7. Car to Car analysis

    Hello, I'm getting this error while solving. I reflected the meshed model of the chassis and gave initial velocities in opposite directions Used entity for master and sets for slave to get red and blue, using comps for both master and slave gets the master surface empty Gave eng control cards Updated all the elements elem type in 2d-> elem types. Still getting this error in solving and these messages in model checker. Its urgent Thanks in advance
  8. Convert .nas into .rad

    Hi every one, I have the student version of HW and I can't import a .nas file in HyperCrash. How can I convert it in a .rad file please ? Happy holidays !
  9. Contact surfaces

    Hello everyone! I need your help. Fllowing picture shows the case i want to simulate. I have a problem to create the contact between the component and rigid walls. Walls have to be fixed and the part lies on them and is fixed by screws. I would be very happy if i get your help. Many Thanks in advance! Best wishes from Germany!
  10. How do I get the curve points for bi-linear material property for doing crash analysis in Radioss from following data for my AISI 4130 material E- 210 GPa UTS- 735 MPa Yield- 604 MPa Elongation in 50mm GL- 23.5%
  11. Hello Altair-Forum, it's my first topic in this forum, I really don't know what to do anymore. No matter which model I want to run with Radioss (independent of simulation type, in this case impact tutorial of two tubes), I'm always getting the error message from the picture: **ERROR : CANNOT EXECUTE RADFLEX_2017 OR RADFLEX_2017 NOT FOUND As another topic in this forum suggested, I already tried to find the RADFLEX-file in the hwsolvers folder in my install directory, but I can't find it. OptiStruct-Solvers are still functioning perfectly. I already ran the simulation for the model-document in the attached files a week ago, and it worked out fine. But right now there seems to be this error which I cannot explain to myself. I'm working with HyperWorks 2017 Desktop, a Student Version, since three months. I'm thankful for any help in advance! 02_Pipe_Impact.zip
  12. Hy, I'm working at composite simulation and I need some help: I have to verify material card data give me by laboratory; with 0°/90° tensile test no problem but with +45°/-45° experimental curve and RADIOSS curve are totally different. I try to eplain my problem better: material constants (by experimental Test) are E11= 20067 MPa, E22=23200 MPa, G12=1519 MPa, G23=1444 MPa and G31= 1444 MPa. I have reproduced experimental test in RADIOSS and I have done card fitting. In 0°/90° tensile test curves were very different but after a little modification of elastic modulus, they fitt enought: The problem is in +45°/-45° tensile test because curves are too different: Radioss curves are made in Hyperview, protting strain and stress of an element. What am I doing wrong? Could someone help me? Thanks in advance.
  13. Hey Guys! I would like to ask you that do you know such kind of script that could import data from a .csv file and export it to a .rad file to change material data or something. I would like to accelerate my work in RADIOSS to manipulate the .rad file. I would like to change the .rad file as fast as possible, that's why I thought about script. Thanks for your anwer in advance! Best regards, Tüki
  14. Dear all, Please see the attached video and image. I am not able to understand the deformation behavior of the model. My load is transient (plot is attached). Initially from the zero position the model starts to deform in the direction of load which is pretty understandable. But at the end of the video the model could be seen deforming in the direction opposite to what is expected. Would anybody please elaborate why is it happening? What care should I take if it is because of some damping issue? P.S. - The deformations are scaled up by the factor of 500. P1.avi
  15. AMS

    Hi All, I am Running a Frontal crash Analysis. Will AMS suit for this. The time step is not reaching the target value. But the energy error is increasing from the beginning. Need Hellp. Regards, SUBHU
  16. RADIOSS TIMESTEP IN INTERFACE

    Hi All, 10 0.1266E-05 0.1266E-06 SPRIN 590305 0.0% 0.4177E-01 0.2840E+09 0.3311E-03 6.050 0.2584E-03 WARNING MINIMUM TIME STEP -0.4725E+18 IN INTERFACE 784 (DTMIN= 0.0000E+00) Is the time step goes in negative.!!! I haven't specified any values for dtmin in my type7 interface (id .784). But I am getting this warning at the start of my engine. Any Hint PLs. Regards, SUBHU
  17. Hello Everybody, I am trying to experiment with a 4 mm thick plate (100 mm length, 50 mm width) having cantilever support at one end and a dynamic force applied at the other end. The .hm files and the force curve is attached for the reference. I have two cases: 1) The plate meshed completely hex elements (8 noded hex) 2) The plate meshed with the shell elements (4 noded quad) The force is applied at 26 nodes of conc. nature as shown in the figure I am getting different contours in both the cases. Why am I getting so, please explain? 2Dto3D_OnlySolid_4mm.hm 2Dto3D_OnlyShell.hm
  18. strees(t) vs von-mises(s)

    I am performing stress analysis of component assembly having a solid block and a shell plate connected to each other.My question is what is the difference between stress(t) and von-mises ?
  19. Strain analysis in radioss

    Hi there, I want to get the strain analysis in hyperview for Radioss. Please guide me. What cards do I need to add in my .hm file and what is to be added in output block. I want to get principle strains, von mises strains and compressive and tensile strains in my model Sincerely Surya
  20. MAT LAW 36 - PLAS TAB

    Hi All, Does the MAT LAW 36 takes only plastic strain vs stress curve or total strain vs stress curve.? Regards, Subhu
  21. I am trying to run a dynamic crash analysis in hypermesh, there are no errors in the model. But the solver ends in 1 second and only one result file is generated which doesn't contain anything. Card info: TStop: 0.002 Tstart: 0 Tfreq : 2e-6
  22. After tensile test simulation I am getting the value of plastic strain. while stress strain curve also have the value of elastic strain. so how can I plot complete stress strain curve after tensile test simulation.
  23. ERROR

    THE error is increasing what to do ? NC= 9000 T= 8.4895E-01 DT= 9.4325E-05 ERR= -5.6% DM/M= 0.0000E+00
  24. External Forces Work

    HI All, I am running a crash analysis. I have no external force applied to my model except initial velocity and gravity. the model is set to impact on a rigidwall Will the External Forces Work remains constant or increase or decrease?? THANKS in Advance Regards, SUBHU
  25. Hi @George P Johnson, I want to use /STACK and change Ipos = 4 (the bottom surface of the shell is considered as element reference plane). RADIOSS doesn't seem to have this option. Instead I can only choose Ipos 0 or 1. What do I have to do?
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