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Imre

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  1. Hey Rahul! Thanks for the quick answer. I am aware of this ebook and find it pretty useful. I think I will make a few test to compare the two methods.
  2. Hey Guys! I've just wondering, it is useful to apply second order element for composite in Hypermesh using Optistruct as a solver? I think the composite theories use pretty much linear approximation between layers that's why I'm asking this "silly" question. Thanks for answers in advance! Have a nice day, Imre ps.: if you have any good tutorial, books etc. for composite modeling I would be grateful if you can share with me! :)
  3. Hey guys! I would like to do a linear thermal analysis. I would like to catch the proper behavior of my system that's why I used constraints in the thickness direction of a thick aluminium plate. The plate should dilate in all direction but the top side of it. How can I apply such constraint which allows the displacement of a node in the positive direction of an axis and obstructs the DoF in the negative direction? Should I use some kind of contact for this purpose? Thank you for your time and your answer in advance! Kind regards, Imre
  4. Hi Premanand! Thanks for the answer, I couldn't find this topic because I had searched for keywords "inserts", "composite" etc... The topic what you linked in is very helpful, thank you for it. Do you or anyone know which is the best way to model this kind of "rip out problem" if it's important to catch the real behavior of the rupture of the composite plate? I think solid element would be better option in this case but I don't know how can I model properly composite with solids. Are there a same solution like in the case of shell elements: create plies and then a stack laminate or should I create all the solid elements separately? In that case it would be very thin solid element which could cause inaccurate results. Thank for the help!
  5. Hello Altair Community! I would like to model a so called "bighead" insert which is laminated between the plies of a composite plate. I want to simulate the rip out and measure the force etc. So how can I model properly this problem? I attached an image where you can see how I want to model this insert. Should I use solid or shell element? If I use ply-based modeling I can not find a way to model a bighead between plies. Thank you for your answer in advance!
  6. Hi Balázs! Thanks for the information, I will try it. Kind regards, Imre
  7. Hey everybody! I've just tried HyperLaminate modul in HyperMesh and found that it can calculate the stiffness of a composite laminate, the [A] [D] matrices etc. as you can see on the attached images. Is there any tool which represent the stiffness of the laminate in polar chart? I think Ansys is capable of doing it, but I could not find this function in HyperWorks. Thank you for your answers! Kind regards, Imre
  8. Hey guys! I saw one composite optimization tutorial where the units of the results were not S.I. (lbs, ft etc.). My question is: how can I modify the unit of my input parameters? So far I thought that Optistruct use mm, s, MPa, ton as unit and I have to calculate the conversions between different units of measure. Thanks for your answer in advance! Best regards, Imre
  9. Hi Prakash! Thanks for all of your help! I am aware of tip&trick topic on altairuniversity website. I like the support and the development of the Altair, thanks for all! Best regards, Imre
  10. Hi Prakash! Thanks for your help! With Geometry ply smoothing I was able to get something similar. I think I have just to make some magic with the settings (iteration steps, area ratio etc.). I read a former topic about the ply-shape smoothing where you wrote that "Area ratio: local region area / total design area (real value between 0.0 and 1.0. Default=0.01)". Are the area ratio calculation method the same in OSSMOOTH and in the Geometry Ply Smoothing (in Aerospace menu)? Ps.: where can I check such tip&tricks that you wrote me before about the debug control card? I did not find the debug card in the HM, HW, or Optistruct help. In the help of control cards that is all about debug card: "Some special or custom features can be accessed through the use of 'debug, <string>, <real>' statements.", which is not so much help for me. Thanks for your help in advance! Imre
  11. Hi Prakash! I add control cards DEBUG, FS-SPLIT. After the free-size I got 16 plies just like in the tutorials, and the shape and thickness of the plies were the same. But OSSMOOTH algorithm seems a little bit problematic as you can see on the picture. I sent you the updated .fem file via your file transfer page. Could you run an OSSMOOTH with the same settings to see what kind of results you got? Thank you for your help!
  12. Hi Pagadala! Of course I can share the file. I send it via FileTransferLink.
  13. Hey guys! I made a tutorial of composite optimization which contains a ply smoothing steps. The name of the tutorial: OS-T: 3400 Design an Open Hole Tension (OHT). The model setup was the same and I got the same result for linear static analysis just like in the tutorial. The optmization went well, I got the same result as you can see on the attached picture. In the tutorial the name of the plies are different because I use the version 2017.2 . I have 2 plies which contain the same element like in the tutorial. After free-size optimization I made the next step: OSSMOTH. It gave me some funny result as you can see on the pictures. You can see the settings are the same and the results still different. On the 3rd picture you can see the OSSMOTHING result from the tutorial. You can see that the settings are the same but the results are very different. Could someone explain why I got so different result? Thanks for your answer in advance! Best regards, Imre
  14. Thank you very much, it is working fine.
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