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Everything posted by Farper

  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.
  15. Dear @Ivan Thank you for your help. I have tried to change the force to linear static and the design is feasible but I cannot see the lattice part in HyperMesh. could you please take a look at my file. HM37_optimized.fem
  16. Eventhogh I had changed the constraints above 200 again I have the following errors. First: ANALYSIS COMPLETED. OPTIMIZATION HAS CONVERGED. INFEASIBLE DESIGN (AT LEAST ONE CONSTRAINT VIOLATED). Then: ANALYSIS COMPLETED. *** INTERNAL PROGRAMMING ERROR *** in file "dsetio-inc.h", at location # 132.
  17. Dear @Ivan I also use the 2017.2 student version. Thank you for your help, I completely understand what are the problems.
  18. Dear @Ivan I tried the solution you suggested. But There is another error. would you please take look at my file? 45x45x100 bulk.hm
  19. Dear @Ivan Thank you for the information. My model is supposed to simulate a compression test with enforced displacement. According to the file, you uploaded it is not possible to put constraint limit with this type of displacement. So, what do you suggest as a possible solution wrt this fact that I need to do this simulation with displacement percentage?
  20. Hello again, I just tried to do a lattice optimization for a bulk model under compression but I encountered the message below. I have also attached my file could you please help me to understand what is the problem. Thank you. 45x45x100 bulk.hm
  21. Dear @Rahul R This is the fem file without lattice. ctrlarm.fem
  22. Hi, I just tried to use optisruct to do the lattice structure optimization. The lattice fem file was created but I am not able to see the lattice parts in the model. Could you please take a look at my file to see if I did it correctly or not and what is the problem. I used the lattice option in topology panel(I have attached the photo of it). ctrlarm_lattice.fem
  23. Dear @Ivan I really appreciate your help thank you.
  24. Hi, I need the model file for the tutorial OS-3300: Using the Lattice Optimization Process in OptiStruct. Thank you,
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