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  1. JKL liked a post in a topic by Q.Nguyen-Dai in Midsurface extraction isse   
    Here's the pattern of your mid-surface:

    STEP file:  0686_01_printstruktur_20190212_V001_surf.stp
  2. JKL liked a post in a topic by Q.Nguyen-Dai in Midsurface extraction isse   
    Wow, it's a very big CAD model. Even with small part of this CAD, Hypermesh can't extract mid-surface.
    So the only way is try to understand construction logic and build directly mid-surfaces.
    Good luck!
  3. JKL liked a post in a topic by Simon Križnik in Unable to see energy balance plot in hyperview   
    Hyperview can be used to post-processing animations files. Hyperview can be used to plot time history files. 
    Energy balance curves are output by default, only need to define TFILE output frequency.

    Check the following video (relevant from 1:38:30):

    2016 Directed Learning Webinar Series - Crash Analysis with RADIOSS - Altair University
    TP005_editT01 TP005_edit_0001.rad TP005_edit_0000.rad
  4. JKL liked a post in a topic by Koushik Chandrashekhar in Intersection of elements   
    I think the file has initial intersection. Contact can only create penetration.
    Intersection is a CAD or FE issue. 
    Check the intersections in Hypermesh using Tool > Penetration. This way it displays the intersections and penetrations part wise. 
    I found 19 intersections in your model as shown in the attached image (displayed in white colour on grey elements).
    You need to merge the nodes at highlighted location. Or, move the elements away so that there isn't any intersection.  

  5. JKL liked a post in a topic by Simon Križnik in Issue with Simulation   
    while you have increased the mass of the impactor the initial kinetic energy is still not enough to plastically deform the crash box. You can load the model with imposed displacement and obtain the energy required to deform the crashbox by plotting the total energy in Hypergraph and observing the corresponding deformation in Hyperview. Then you can use this energy as the initial kinetic energy to calculate the required velocity and mass of the impactor. 

    There are modeling errors:
    the base plate of crashbox is not attached to the fixed supporting structure so it will slide sideways when loaded.  the impactor has a relatively small contact area and it can lose contact during deformation. Provide some friction or use larger impactor plate the mesh quality is bad. Use F10 Check elements>3D to check the solid element quality and remesh accordingly.  the impactor and some other components are meshed inappropriately by double walls, effectively halving the stresses. You have to mesh a single mid surface instead. imposed_displacement_0000.rad
  6. JKL liked a post in a topic by Simon Križnik in Issue with Simulation   
    the initial kinetic energy is not enough to deform the crashbox. The impactor weighs 0.6 kg which is far less than the 100 kg structure so the impactor simply bounces off. Increase the kinetic energy by increasing mass, initial velocity or both.
    Negative energy error represents energy dissipated from the system and this can be from many sources like plastic deformation, hourglass energy,  contact with friction, damping,... Review the energy balance to identify the source of this error.
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