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Kensei

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  1. Yes, of course! Please let me know if you require more pictures or different angles.
  2. Thanks! Did you have a look on the model? Could you give me any advice how I could process the part further to make it mappable?
  3. But shouldn't be the part on one side of the geometry be mappable when the corresponding part on the other side and every other part as well, are mappable?
  4. Hello, could someone please explain to me why I can't mesh one part of my completely symmetric geometry? I tried various cutting locations and axes, but I always receive one or more parts of the geometry, which are not mappable. However, theoretically, everything should be okay. Thank you very much for your help! Best, Chris Not_mappable.hm
  5. Thank you, Prakash, for looking into my problem. I was hoping for a fast and convenient way to reanalyse the model, but I feared that this is not possible. I will rebuilt the model in Catia then and set up a fresh optimization.
  6. Yes, I'll upload it to your FileTransferLink in a second.
  7. My STL part looks like this. Not one solid part, but rather an assembly of solid bits and pieces
  8. Yes, I tried. I tried with H3D as well out of desperation, but nothing worked. Maybe my export settings are not correct? I left most of them at the preconfigured values
  9. Hello all, I would like to set up a combined topology and free size optimization. Okay, here is what I would like to do in more detail: My initial design space is a cylinder with a 3 mm thick wall. First, I want to optimize my part with the objective to minimize compliance and the constraint of a maximum volume fraction of, let's say, 30%. Like this, I get the main directions of stress and I see where material has to be. Since the material is pretty thin in the first place, it only takes material away and if I compare the deformation of the original part with the optimized part, of course, I get higher deformation values for the optimized part because there is less material. Therefore, step two: Now in this second step, I would like to take this optimized structure, turn it into a shell, increase the shell thickness T to 6 mm and perform a free size optimization with the objective of minimizing the volume and two displacement constraints. One for torsion and one for bending. I'm imagining an optimized structure, where I have a thicker wall, where the material is really needed to fulfil my deformation constraints and maybe thinner walls, where the stresses are not as high. I tried to use OSSmooth to turn the resulting part of step 1 into an IGES geometry and then use auto midsurface to turn it into a shell. However, auto midsurface does not recognize the part as a solid and therefore does nothing at all when I want to create the midsurface. Just performing step 1 with a thicker wall also doesn't work, since the loads on the part are comparably small and I don't get reliable optimization results when I add even more material in the design space. To illustrate how small the loads are, I calculated by hand how much material I could theoretically remove before the material will enter a plastic deformation. I could remove 90%. Thank you very much for your help! Best, Chris
  10. Hello George, thanks for your answer! I will keep with one consistent unit system, so I don't run into any more problems. The reference values really helped, I was able to identify one wrong statement. Best, Chris
  11. Hello Rahul, thank you very much for your response! Maybe there was a problem with the import, or I accidentally send you the wrong files, but the moments are connected to the geometry using RBE3. Nevertheless, I have the same problem no matter if I use RBE2 or RBE3. Could you go into a bit more detail why I don't get a bending behavior? What can I change to get more realistic results? Is there another way to apply torsion? I am looking forward to your answers! best, Chris
  12. Hello Prakash, thank you for your response. In the mean time I was able to find the issue. My PC has been used by other people before and they left me with almost no space on the hard drive. So, pretty simple solution. Best, Chris
  13. Hello, my latest optimization results with OptiStruct always seem to be a few decimal powers away from a realistic result, so i started thinking about scaling and units. I changed the units in HyperMesh to SI units, so KG, N, M, S Now, when I import my model, which I have created with Catia in the mm scale (one distinctive length is 550 mm), and check this length in HyperMesh via the distance tool, it shows a distance of 550... I changed the units before the geometry import, so is this distance not displayed in m? Which means I would have to import the model with a scale of 0.001 in order so get the right scale? Further, I create a material (aluminum in this case), and the field shows the default 210000 for steel. Now, 210000 is in MPa. Why is this not in Pa when m and kg are my chosen units? It should read 2.1e11 with these settings, shouldn't it? Now when I apply a moment to one end of my part, I should state the value in Nm, correct? Is there any way to really see which values have which unit? At least in OptiStruct in the legend? Thank you for your answeres, I am really confused right now.
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