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Farper

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About Farper

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  1. I have performed a lattice optimization on a cube. I tried to import the .fem file to 3matic but the lattice parts are not shown. How can solve this problem?
  2. Hi, I want to export my optimized lattice part but it seems it is not possible. So, I decided to try 3matic for exporting it as IGES but the problem is I cannot import my .fem file to 3matic and also I cannot export STL from hypermesh. Is there any solution for this problem?
  3. I forgot to mention but I am talking about the workflow in the hyperstudy.
  4. Hi, When I follow the path step by step at the output response step, the problems is the output file is not recognizable by HyperWorks. What is the problem? because I need to define volume/mass as output response.
  5. @Ivan Thank you for your time and help. I really appreciate it.
  6. I mean the lower bound and upper bound of the density for the lattice. And also I have tried to change the lattice parameters that you have mentioned above, it is like combination of all of these parameters. So there is no other option that could automatically guarantee the continuity?
  7. @Ivan As you can see in the below picture the solid part is not connected to the lattice parts. in this case, the simulation is not complete because only the upper part will move and no load will affect the rest of the model (I have also attached the lattice part .fem file). I want to know is there any solution to guarantee the connections in the model? the only way that comes to my mind is to set the lower bond and the upper bond in a way that we could be sure about the connections, but I have doubts that if this design is optimal or not. bulk-5_lattice_optimized.fem
  8. Thank you. Yes I know it but if I want to have combination of Lattice and solid, I should have define stress constraint through responses and design constraints. The other thing is that if I want to guarantee the continuity in my design, is controlling the Lower bound and upper bound the only solution? Or there may be a control card which could guarantee it?
  9. but for the lattice, they should be different. If we consider steel as our material what would be the local and global constraints?
  10. Dear @Ivan Thank you very much. just another question, how can we obtain the stress constraints values? global and local?
  11. Dear @Ivan I really appreciate your help today I got an answer from Altair for internal programming error which says that NLGEOM is not supported: Good Morning, the NLGEOM is an obsolete analysis type no more developed in the last years, in fact when you import the .fem file in Hypermesh you obtain this message: So at the moment please don’t use NLGEOM analysis type but set up the optimization with standard linear static, trying to approximating the behavior of the component in linear theory. In any case, I’m in contact with the developers, if in the next versions will be any changes I’ll inform you. I talked to my supervisor and we had decided to use Linear Static with small steps. Is it possible? I think it could be possible by increasing the displacement gradually. Let me know about your idea.
  12. @Ivan Thank you very much they helped me to understand the lattice better. But as I studied these materials along with the other resources, using nlgeom is not useful. In my case I should optimize a cube under compression. The compression is performed using enforced displacement. To increas the stifness we should use volfrac and compliance responses. Volfrac for the design constrant and minimizing the complians as objective. But all in all I cannot perform this optimization. Using linear static everything is fine.
  13. I should finish my thesis this weekend. My supervisor insists to do a non-linear lattice optimization with enforced displacement. Until now I couldn't find a way to perform it. I just want to know is performing this kind of optimization possible at all? Are there any tutorials that go deep in lattice optimization? (there just an OS:3300 tutorial which is very general and also linear) it is a kind of emergency.
  14. Dear @Ivan Thank you for your answer.
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