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Found 402 results

  1. Hello, I have a persistent error on some elements : ** ERROR ZERO OR NEGATIVE 2D SOLID VOLUME I work with QUAD in Axisymmetrical. Many additional errors were remove during debugging. A similar model (I believe) under an old version worked, however... etienne_AXY_cu_ag.hm
  2. Hi, I would like to perform constituent material property calibration (tow and matrix) in Hyperstudy by coupling Multiscale Designer and Radioss models, similar to: https://www.altair.com/resource/using-radioss-hyperstudy-and-multimech-for-improved-composite-design https://www.altair-gmbh.de/resource/using-hyperstudy-and-multimech-for-advanced-composite-material-design I need to write the solver script that would generate a multiscale material model at each iteration.The Multiscale Designer graphical user interface does not show the commands that are used in the back end programs. Edit: The command lines can be found in the MDS user manual. There is a command for Homogenized Linear Material Export, but the command for multiscale material export is missing. Is this command not available or just missing in the manual?
  3. Hello, I need a help with procedure please.? I am able to create the adhesive brick elements mesh using optistruct (3D - connectors - area - "constant thickness" as Hexathickness - type "adhesives" ) in student version (Hypermesh 2019) (as in the image). But in Radioss ( Block format 140) (Hypermesh 2017.2), the same process is not working. While using the same procedure, I get the surface connector (as below) without thickness (even while creating through: 3D - connectors - area - "adhesive(contact)" as type). But I would like to create the brick elements. Also, I would like to do hexa positioning it with "mid thickness" option and I couldn't change the "shell gap" option to the "mid thickness" with the drop down (as shown in the highlighted below). Could anyone please tell me if it is possible and also how to create it in the Radioss.? Thanks in advance!
  4. Hi, I have an issue with cut approach (https://altairuniversity.com/learning-library/radioss-sub-modeling-cut-approach/). I'm modeling an half of full vehicle with the cut approach above. From this sub-model, with hyperstudy I modify a little bit the geometry and study how the crash changes dynamic. I wonder how dynamics could vary among runs if the section-force imposes original displacements? Many Thanks
  5. I have done three point bend test using hypercrash to make model. I am using radioss solver. I am able to create model without any error. But there is no option to study result is coming in radioss solver window. Kindly help.
  6. Hi guys, i have a problem with my model when i ran the simulation. I would like to do the Danner crash test using radioss solver. But, when i ran my simulation, the time remaining indicator kept increasing. So, i would to know whether have i done wrong? Can someone please explain this situation to me? Please.
  7. Hello, I am trying to perform a quasi-static simulation using radioss. The initial model entailing solely hyper-elastic materials is working fine. Now I replaced a material type 42 with material type 37 that is a bi-phase material. My problem is that when enabling a mass scaling through /DT/NODA/CST in order to reduce the kinetic energy of the model and perform a quasistatic analysis, the model doesn't follow the requested time step. And then the solver stops due to negative volumes. Is there a way perform a quasistatic FSI with radioss? If so which are the appropriate values for MAT37? Is it better to choose a different material? or it isn't possible to perform such an analysis and thus move it to acusolve. Here is my .hm file Quasistatic_indentation_fluid.hm
  8. Hello, for my Formula Student Team I am trying to simulate the deformation of the Anti Intrusion Plate. To replicate the real test I've tried to implement the Honeycomb Impact Attenuator Tutorial(https://altairuniversity.com/wp-content/uploads/2016/11/Crash_Box_1.pdf). I've attached the file. When I try to run the simulation the Energy Errror starts at 0% and then rockets up to 99.9%. Then the Simulation stops. ROOT: SteelDummy RESTART: 0001 NUMBER OF HMPP PROCESSES 4 02/12/2019 NC= 0 T= 0.0000E+00 DT= 2.1400E-04 ERR= 0.0% DM/M= 1.7748E-05 ANIMATION FILE: SteelDummyA001 WRITTEN NC= 100 T= 2.1400E-02 DT= 2.1400E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 54.23 s REMAINING TIME= 126646.67 s NC= 200 T= 3.5753E-02 DT= 1.2229E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 54.82 s REMAINING TIME= 76607.94 s NC= 300 T= 4.7072E-02 DT= 1.0479E-04 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 55.35 s REMAINING TIME= 58738.95 s NC= 400 T= 5.6878E-02 DT= 9.1867E-05 ERR= -0.0% DM/M= 1.7748E-05 ELAPSED TIME= 55.87 s REMAINING TIME= 49054.49 s MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 700 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 1940 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 3120 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION MESSAGE ID : 259 ** WARNING ZERO OR NEGATIVE VOLUME : 3D-ELEMENT ID : 4080 ELEMENT IS SWITCHED TO SMALL STRAIN OPTION NC= 500 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 56.40 s REMAINING TIME= 44815.82 s NC= 600 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 56.93 s REMAINING TIME= 45237.79 s NC= 700 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 57.43 s REMAINING TIME= 45635.91 s NC= 800 T= 6.2841E-02 DT= 1.1098E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 57.99 s REMAINING TIME= 46084.90 s NC= 900 T= 6.2841E-02 DT= 1.1099E-13 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 58.58 s REMAINING TIME= 46552.16 s MESSAGE ID : 205 ** RUN KILLED : ENERGY ERROR LIMIT REACHED NC= 1000 T= 6.2841E-02 DT= 5.1022E-18 ERR= 99.9% DM/M= 1.7748E-05 ELAPSED TIME= 59.22 s REMAINING TIME= 47060.74 s ANIMATION FILE: SteelDummyA002 WRITTEN Thanks upfront, Konrad SteelDummy.hm
  9. Good morning, I have an issue when I run a RADIOSS .rad file on my local group's cluster. At the end of the analysis, It doesn't automatically extract the .h3d file, although It does so locally on my pc. I have all animations A0*, but I'd rather It extracts h3d automatically instead of doing manually with hvtrans. I use Radioss Block 120, Many Thanks
  10. Hi, In radioss manual, there is a contact energy formulation. This formulation considers normal force and tangential force? or only consider normal force? What is the 'L' and 'n'?? Thanks
  11. Hi, In RADIOSS theory manual, TYPE7 contact energy formulation is as follows. In formulation, what is the 'L' and 'n' ?? I think this contact energy formulation is only about normal contact force. Is there any formulation about tangential contact force? I want to know the reference about the formulation. Thanks.
  12. Hi This figure shows the accelerations on the node using /TH/NODE and /TH/ACCEL. F_cut of /ACCEL is the recommended value (1650Hz). Filter CFC1000 (F_cut 1650Hz) is applied the acceleration using /TH/NODE. Why are they different? Thanks.
  13. Hi, I want to use /TH/MODE. I can't find it in HM. How can I find it?? Thanks.
  14. Hi, I'm using Hyperstudy 2017.2 and Radioss as a solver. I encounter an error when I perform the evaluate step in the DOE approach. It happens that during a run (whatever) the evaluate and extract steps can't finish succesfully, but there aren't errors in the messages box and in the .out file I can read that analysis is already finished with normal termination: in spite of this, the cursor keeps turning and seems to be waiting to finish evaluation. I realized that when it happens, there isn't the .h3d file in the run folder, even if run is completed and all animation A0# are created. I realized also that by finishing the "hvtrans" process from the task manager, or (is the same) Tclsh85t application, hyperstudy concludes the evaluate step, extracts results and goes to the next run. It's a random problem, but it always happens at least once. Thank you all for helping out.
  15. Hello. I'm carrying out roll over analysis on simple bus as shown in attached image. I've assigned imposed velocity along axis and not get rotation on tilt table. Ff you can help me in achieving a tilt please provide some steps to follow. simulation_15.avi
  16. Hi, The problem is as follows. After 1 cycle, run file stops. Why doe it happens? How do I do? Thanks
  17. Hi, I have a question that comes from the user guide. (Radioss 2019 User's Guide p.239) 'To describe pretension with this method another two spring elements (/PROP/SPR_PRE and /PROP/ SPR_BEAM) need to be added.' I have an example. When the bolt joint with preloading (bolt joint stiffness 10000N/m, preload 10kN) is replaced by RBODY+SPRING element, 1) Distance between node1,2,3 is 10mm? 2) In PROP/SPR_BEAM, K1 is 20000N/m? (due to series spring??) 3) In PROP/SPR_PRE, Stif0 is 10000N/m? (same as bolt joint stiffness) Thanks
  18. Hello, I am simulating an impact of two bars falling to the floor. These bars are initially held together with a RBE2 element while falling down to the floor. I am now trying to delete this connecting RBE2 element right before the bars hit the floor. How do I do this? I am currently experimenting with sensors but I haven't been able to figure it out yet. Thank you Toon
  19. Hi, I want to find the theory manual about interface type 24. Where is it? Thanks
  20. Hello, I am trying to impose a temperature load on a thermobimetal disc which should result in a dynamic snapping Motion because of the different thermal Expansion coefficients. I have previously imported a state file that includes the Change in curvature and stress caused by deep drawing. However, after running the Simulation no Change is visible at all. I am assuming that I did something wrong with the control Cards. Thank you in advance for your help. Schnappen_HC_0000.rad Schnappen_HC_0001.rad Schnappen_HC.h3d
  21. Hi everyone, how it is possible to define the /INISHE/ORTH_LOC card? I can't find the option to define correctly it. I need to initialize the orientation of an orthotropic material (that's defined as a P9 shell property). Thanks
  22. Hi, I want to know if what I thought is correct. The interface setting of two shells is as follows. Top shell is 1T and bottom shell is 3T. Distance between two shells is 2mm. -> No initial penetration Igap determines how the size of the gap is calculated. Igap = 1 Then, in my model, Variable Gap = 2 And then my question is as follows. In this model, if Gapmin is 1.5 , contact force is applied when distance between two shells is 1.5 below figure?? (when 1.5 < distance between two shells, contact force is not applied??? ) Thanks
  23. Hi, I learned that when initial penetration is too deep, Fpenmax is applied. 'The node stiffness is deactivated if the Penetration ≥ Fpenmax * Gap, whatever the value of Inacti.' In above sentence, 'Penetration' is only initial penetration or any penetration? Thanks.
  24. Hello, I am trying to simulate a deep drawing process of a thermobimetal plate with HyperCrash. The current model is very crude, but will be improved once this Problem is solved. When trying to solve my model with RADIOSS I Encounter the following error: ************************************************************************ ** ** ** ** ** RADIOSS STARTER 2017.2.1 ** ** ** ** Non-linear Finite Element Analysis Software ** ** from Altair Engineering, Inc. ** ** ** ** ** ** Windows 64 bits, Intel compiler ** ** ** ** ** ** ** ** Build tag: 0876086_123352072.1_1020_0049245_10 ** ************************************************************************ ** COPYRIGHT (C) 1986-2017 Altair Engineering, Inc. ** ** All Rights Reserved. Copyright notice does not imply publication. ** ** Contains trade secrets of Altair Engineering Inc. ** ** Decompilation or disassembly of this software strictly prohibited. ** ************************************************************************ .. BLOCK FREE FORMAT .. STARTER RUNNING ON 1 THREAD .. CONTROL VARIABLES .. UNITS SYSTEM .. FUNCTIONS & TABLES .. MATERIALS WARNING ID : 765 ** WARNING IN MATERIAL LAW WARNING ID : 765 ** WARNING IN MATERIAL LAW .. NODES .. PROPERTIES .. 3D SOLID ELEMENTS .. 3D SHELL ELEMENTS .. 3D TRIANGULAR SHELL ELEMENTS .. SUBSETS .. ELEMENT GROUPS .. PART GROUPS .. SURFACES .. NODE GROUP .. BOUNDARY CONDITIONS .. IMPOSED VELOCITIES .. AMS INITIALIZATION .. DOMAIN DECOMPOSITION .. ELEMENT GROUPS .. INTERFACES .. INTERFACE BUFFER INITIALIZATION .. RIGID BODIES .. RETURNS TO DOMAIN DECOMPOSITION FOR OPTIMIZATION .. AMS INITIALIZATION .. DOMAIN DECOMPOSITION .. ELEMENT GROUPS .. INTERFACES .. INTERFACE BUFFER INITIALIZATION .. RIGID BODIES .. ELEMENT BUFFER INITIALIZATION ** ERROR TRAPPED : REPORT TO LISTING FILE ERROR ID : 760 ==== End of solver screen output ==== ==== Job completed ==== I have attached the .rad file I exported from HyperCrash. I would appreciate any help. Thank you in advance. Tiefziehen_HC_0000.rad
  25. Hi, I use /TH/INTER to obtain the contact force. In Radioss help, variable group is as follows. However, In Radioss, variable group is below. Which variable is absolute value? Thanks.
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