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Found 7 results

  1. What is the meaning some of the results such as mass and node mass or density ? And what other things we should check in explicit analysis apart from what we need such as displacement and stress.
  2. hello, everyone I want to get the topology optimization result in hyperview, such as displacement, stress state, elements desity and so on. But I don't know how to get those data. Hyperworks do not write out the hyperview command to command.tcl. And I try to get it throught hyperview hierarchy, as show in the figure. I do not find what I need. I have no idea if somethig wrong. Thank you for you any advice.
  3. Hello, I have a question about the new function topology optimization with lattice: Can the lattice density be variable? I saw that I can set the bounds of density where to put the lattice structure, but has it all the same structure? or can the lattice structure be variable with the density? Thanks
  4. Hello, I am trying to run optistruct from the command line in MATLAB. I have been able to run it using the line; system('"C:\Program Files\Altair\2017\hwsolvers\common\tcl\tcl8.5.9\win64\bin\wish85t_os.exe" "C:\Program Files\Altair\2017\hwsolvers\scripts\hwsolver.tcl" -solver OS -icon "C:\Users\e-tru\Documents\beam_maker_altair_44.fem"') But I also want to be able to output the element densities and .sh file after an optimization and have been unable to do so. I have tried invoking optistuct.bat to see if that would help me and used the line; system('"C:\\Program Files\\Altair\\2017\\hwsolvers\\scripts\\optistruct.bat" "C:\Users\e-tru\Documents\beam_maker_altair_44.fem"') Unfortunately it did not work and the following error was generated; ERROR in hwsolver script execution: couldn't write file "beam_maker_altair_44.err_39816.out": permission denied *************************************** What does this mean? How can the .sh file and densities .dens file be generated by calling the optistruct in the command prompt (in MATLAB)? My operating system is Windows 10, Hypermesh version 2017 and MATLAB R2017b. Thank you, -Eric
  5. Hello everyone, I have been conducting some tasks which use an iterative approach to correlating CAE results to physical testing. We attempt to match the modal behavior of modeled parts to the real thing, and I believe the process can go much faster (and more accurately) if we incorporated some optimization techniques into the process. Our goal is to determine the correct modulus for the material, and while it generally takes 1-2 iterations to get it right when tweaking the cards by hand, I'd still like to set up a general optimization template to do it automatically. Now, I'd be able to do this sort of thing in LS-Opt, where all that would be required is a simple replacement of the modulus and density of the material with some generalized parameters; then you could just apply upper/lower bounds to each parameter and have LS-Opt check the normal modes after each iteration, and compare them to experimentally determined values until a good correlation was achieved. The problem, however, is at my current company, we don't have LS-Dyna (or Opt), and I have no idea if Optistruct is capable of this type of optimization (I've used it for topology and sizing in the past, but never for material modeling). Specifically this is what I would like to do with the optimization loop. 1. Parameterize the elastic modulus of a material card. (Example: Modulus of 116500 MPa becomes some parameter <E>) 2. Impose upper and lower bounds on that modulus: ( 90000 MPa < E < 120000 MPa) 3. Run a normal mode optimization (preferably without mode tracking, as our physical testing rig only looks for out-of-plane modes and will skip other resonant modes), which looks for certain frequencies and attempts to match a frequency range by varying the modulus. 4. Run until some confidence has been achieved for the material. Any idea about how I could go about doing this? Thanks for your time. -George
  6. Hi, I already worked a lot with hyperworks but right now I'm looking for a possibility to optimize the material within a given volume. That means I have a component made out of undirected long fibers (material is idealized isotropic) with a fixed volume and want to know where do I need which fiber volume fraction. With lower fiber volume fraction, the density of the material gets lower (and the mass of course too) but the mechanical properties getting lower as well. And that's the optimization I want to have... high fiber volume fraction only where it is necessary to minimize the weight. I don't want to make a topology optimization because the shape and the volume is completely fixed. So do you have any idea how i can handle this problem? I'm not sure if it is possible to have a continuous density distribution within the component with an optimization but maybe I can define for example 10 times the same material but with different fiber volume fractions (= different density, young modulus, yield strength...) and the program tells me where which material should be. Thank you for your help!
  7. Is there any way by which I can perform a DOE for determining appropriate material properties (Young's Modulus, density, poison's ratio, etc.) with a particular type of analysis? Please guide me..
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