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  1. Hi @Prakash Pagadala Thanks for your response. in fact, the problem I am facing deals with a simulation of the effects of fast and slow cooldown in the residual strains in the material. I already create the model with solid elements for each layer. We have two specimens that are are cooled down at different rates (one is cooled down in the oven) and the other one is forced with dry ice. the two specimens are instrumented with strain gages in the different layers and we notice different strains for both process. In this case, Can I still go for a Heat transfer transient? Thanks for your support
  2. Hi @Prakash Pagadala, I was doing some thinking about how to solve this problem with this simulation. Is it possible to do the heat transfer analysis using a composite ply by ply solid modeling? Is going to be more time consuming but maybe this can work. What do you think? Using PSOLID and MAT9ORT
  3. Dear @Prakash Pagadala Thanks for your suggestions for my analysis. I have been trying to model it directly from radioss but not completely sure about some aspects. I have some doubts regarding the material orientation definition. Is not possible to assign a cylindrical system to my elements? Are cylindrical systems supported in radioss for a NLGEOM analysis? Is there a way to consider the external surface of the thickness of the laminate as the contact surface? When I run the simulation of a compression test, if the midsurface of the laminate is not closely in contact with the compression plates, it is detected as an impact (and is something I would like to avoid). Maybe is an option that I am not activating. thank you for your help
  4. Dear Prakash, Thanks for your fast reply. I loaded the .rad file to double check about this error and is what we were thinking. I am trying to model it with radioss but I have not that much experience with radioss control cards. Do you know of any tutorial that can be useful for this application? Is this the correct procedure for considering a future analysis of first ply failure of my composite? Thank you in advance
  5. Dear All, I am trying to simulate a compression test of a composite ring. With NLQS analysis, the solution goes pretty good and somehow accurate, but with this type of analysis, I can't get the CSTRAI and CSTRESS and failure criteria (not supported using NLOUT). I tried with NLGEOM(implicit) analysis and is working but the results are not the expected ones (Although I can obtain the composite analysis that I wanted). I realize that there are some penetrations in the model that I thought was not there since I choose a z0 option = TOP. It could be possible, that the solver uses the real midsurface of the laminate and so he can detect some penetrations and affecting my simulation? See the attached pictures Pic 1. Z0 = TOP Pic2. Z0 = real (midsurface of laminate) Not sure if I consider the midsurface of the laminate (and leave the half thickness between the end surface of thickness and the blue plate) the results will not be correct ones. Thank you for your time
  6. Dear Prakash, If I am planning to use Solid elements for composites, how is the distribution of the stacking of the laminates in the thickness of the model? Should I need to have the number of elements through the thickness of the model the same of the number of layers (and with the same thickness per layer per solid)? Or is HM automatically assigning one element for each ply Thank you for the time
  7. Dear Prakash, Thank you for the explanation.
  8. Hi, Thank you very much for the recommendations. I will try both cases and see wich one will suit better for me. Thanks again
  9. Hi Prakash, Thank you for your reply. Do you have any suggestion for assessing my simulation? I think the only way to see the influence of the temperature in time on the residual stresses is with a heat transfer analysis. Is this possible with layered elements? Or is there a way to convert this layered shell elements into solid elements? I would really appreciate if you can suggest me something Best regards,
  10. Dear All, I am trying to do the tutorial of the rubber spring but when I am setting the analysis load step, I can't find the Analysis type Geom non linear (implicit) Is there something missing in my version of HW?
  11. Hi Everybody, I am trying to simulate the residual strain on different ply's of a laminate due to different rates of cooldown. I was planning to do this with a heat transfer analysis (transient) but I believe that composites are not supported in transient heat transfer. Is it possible to perform a sort of transient analysis applying a Delt Tº in the different time frame? I was thinking to do this with TLOAD1 with excited a TEMPD and a Table1 Is this approach correct? Thank you beforehand
  12. Hi everybody, I am trying to run a simulation in optistruct but I have and error. I a normal lienar static simulation. *** INTERNAL PROGRAMMING ERROR *** in file "osinfo.F", at location # 412. ioerr(1) = 1 **** ABORTING RUN DUE TO AN INTERNAL ERROR **** I am trying to figure it out what does this error means. Can anyone help me?
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