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Ivan

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Ivan last won the day on November 17

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  1. Ivan

    I am stuck and need help

    That's a good question. There is localized buckling (more deformation) of outer pillar component in contact with the impactor due to compressive stress and the inner pillar does not buckle, because it is loaded only by tensile stress. In this image blue is compressive and red is tensile stress. There is also a weak coupling between the pillars unlike for example I-beam or solid beam which deform more uniformly. To post-process strains define control card ENG/ANIM/SHELL/TENS/STRAIN and set Istrain=1 on properties of interest. In HW plot strain>signedvonmises. Modelle_corrected_strain.hm
  2. Hi @s3b1k3 there is manual option: and here is Drape Estimator: Drape Estimator - Altair University
  3. Ivan

    I am stuck and need help

    Usually, the displacement is plotted on the X-axis and force on Y-axis. So just switch components accordingly. Then apply -1 scale factor on X component, because Y displacements are in the negative direction in global coordinate system. If you have planar symmetry (half or quarter) you should also scale Y component by 2 and 4 respectively to compensate for the model reduction. The same can also be achieved with cross-plot functionality in HG. Cross_Plot.pdf Crossplot.mp4
  4. Ivan

    I am stuck and need help

    I am familiar with basic functionalities in HyperStudy, but not enough practical experience to give useful advice. But you can open a topic in HS forum. There is a free ebook and also some HS videos on Altair Germany.
  5. How many interface nodes are in the model? Try to reduce them to see if it affects the number of modes. From Practical Aspects Of Multi-Body Simulation with HyperWorks: There is no explanation on how modes are computed for CBN method.
  6. Ivan

    MAT/LAW70

    Hi @Truc please share the starter out file (run_name_0000.out) or copy/paste only the ERROR ID: 867 part of the file.
  7. The definitions are the same regardless of the preprocessor used. from Practical Aspects of Multi-Body Simulation with HyperWorks
  8. Hi @LOKESH KATARI MotionView allows you to specify a limit on the modal information contained in your H3D file. Two methods are available to set these limits. You only need to define frequency upper bound or number of modes, not both. -Specify a maximum number of Eigen modes for which modal data is included in your H3D file. OR -Specify an upper cut-off frequency for the Eigen modes. When a cut-off frequency is specified, normal modes analysis can be performed using one of two algorithms: Lanczos or the automated multi-level sub-structuring eigenvalue solution, AMSES. You can manually insert certain cards in the Optistruct input deck to run the Component Mode Synthesis routine. These cards allow file size reduction of a flexbody. This helps in faster pre/post-processing and overall better efficiency of the process. You can manually edit the preparation file generated by FlexPrep to reduce the size of the flexible body H3D. By modifying the input deck, you can: •request only the skin elements of the flexbody to display . •request stress and strain information for a selected set of elements. •use released degrees of freedom for the interface nodes. If the problem persists please share the model
  9. Hi, session file (mvw) is useless without model file, so I am assuming the model is the same as in the other topic. Initial velocity should be applied to the master node of the rigid body. initial velocity.hm
  10. Ivan

    error id 760

    This kind of problem is unphysical: you are forcing nodes (imposing velocity) to penetrate into the rigid plate which is non-deformable. To simulate impact the ball should have an initial velocity so the nodes are free to deform according to the laws of physics after impact. Also, boundary conditions should only be applied to the master node of the rigid body. new_Model (2).hm
  11. Ivan

    Radioss problem

    Maybe there was no animation output frequency (ANIM/DT) defined. Just find the folder with model files and open run_name.h3d file.
  12. Ivan

    error id 760

    Hi, Radioss will finish the run after 1 cycle if everything is covered by rigid element, i.e. there are no deformable elements. ** CONNECTION THROUGH RBODY OVER AMS AND NON AMS DOMAINS If rigid body overlaps the AMS and non AMS domains, the AMS will expand overall the rigid body if Iexpams is set to 1. You can do that manually (HM does not support this keyword) or use HyperCrash to edit the rigids. If the Iexpams is set to 0 (by default) then AMS will not be effective on components which have rigids connected to them.
  13. Ivan

    Radioss problem

  14. Ivan

    Radioss problem

    The problem is you have SHELL3N (triangle 2D elements) in component which were assigned law 28 material. Isolate the components assigned to law 28 material and mask solid elements, then delete the shell elements.
  15. Ivan

    Radioss problem

    Hi @anderlanza this error is because law 28 honeycomb material is assigned to 2D elements, which is incompatible (see attached document). Material Compatibility.pdf
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