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  1. @Q.Nguyen-Dai I unfortunately cannot upload my model right now, but it seems we found the cause. Thank you!
  2. @Adriano A. Koga It seems that's the case. The values start showing back when they are no higher than 4.5. Thank you!
  3. @Adriano A. Koga Thanks for your reply. The second approach seems to be what I am looking for. I will try it and give a feed back later.
  4. Hello everyone, I am running composite size optimizations and I came across a problem. I need to relate the thickness of different design variables (plies), however, there are no constraints available that address this issue. Is there any CARD that allows me to create such a constraint? *actually, the dependent design variables should be in a specific thickness range (e.g., 0.5t<t1<t), where t is the thickness of the "main design variable" and t1 the other design variables.
  5. Anyone? I have 3 buckling loadsteps and the buckling factors (BF) can be obtained without problems in a simple analysis. I noticed that during optimization the BF cannot be found for the loadstep with the largest BF value (analysis results). Also, the BF are finally calculated when the values get closer to the constraint I am using (3). Is it possible that the optimization only returns BF values for a certain range?
  6. Hello everyone, I am running a composite size optimization (OptiStruct version 2017.2) and considering displacements and buckling factors as the constraints of my problem. However, for some iterations and loadsteps, I am receiving the message "no buckling modes found". I already tried increasing the number of requested buckling modes in the EIGRL cards as I saw someone suggesting in another forum, however this problem keeps happening. Does anyone know how to solve this issue or what is the root of the problem?
  7. I actually figured it out, thank you so much. If anyone is interested, I only created the equation using DEQATN and then created DVMREL2 and called the equation and design variable ID in it. All the process is done directly in the .fem file.
  8. Hello Roberta, thank you for your response I thought about writing a user-defined material but the card DVMREL2 seems to be a simpler/better solution. Would you have any materials or references on how to add/edit this card? I haven't found much information out there. Young's modulus would be dependent on the thickness of the plies through a rather simple equation.
  9. Hello everyone, I recently came across Compose, which I have no experience with at all so I do not know about the capabilities of the software. Could anyone tell me whether is possible to use Compose to alter mechanical properties for an Optistruct optimization? I want to run a size optimization, however, the material I am considering changes the Young's modulus with thickness. So my idea is to use Compose to make the Young's modulus as a function of thickness. Thank you
  10. Hello everyone, I want to conduct a thickness optimization of a component. However, the stiffness (Young's modulus) of the material I am considering changes according to the thickness assigned, thus, I would like to take it into consideration in the process. Is there a way to model that inside Hypermesh? Perhaps making with Young's dependent on an equation or table values. I think it is similar to the case of stiffness change with temperature where you can address it with some TABLE option but not sure about the thickness.
  11. Thank you! Btw, I also found that you can easily plot and extract it from Hyperview by using derived results
  12. I applied this command but it seems to extract the volume from single elements. I have a component with 1 million + elements so what I need is to extract the volume of every element and save it into a file. Is there a way to adapt this command to automatically do it? Or is there another way?
  13. How would I apply this command line? Scripting?
  14. Dear all, I need to carry out some calculations and for that, I need to know the volume of each element separately. Is there an easy way I can extract these values from hypermesh or even hyperview?
  15. I am modeling seam weld as usual, using the angled quads weld type. For some reason, I cannot find this weld type option anymore. I tried switching between all user profiles already but no success. Any idea what I could be missing?
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