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Gokul Ramarathnam

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About Gokul Ramarathnam

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    United States
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  1. Hey @Hyperman, Unfortunately, I cannot share the model. Do you have any other pointers on where to look or investigate? Thanks!
  2. Hello @Hyperman, I made my simulation quasi static, even increasing the loads in smaller steps with time to relax the load in between but the same issue persists. Any other ideas on why this is happening?
  3. Hey @Hyperman Thank you for getting back to me on that! I think you are right, the load application is too rapid and my internal energy curve is too choppy. I have updated my load curve to reflect a slower loading rate. Thanks and Appreciate your help! Cheers, GR
  4. or Hello, I am running an abuse test on a component with a simulated down load as seen in the curve. The load is distributed to a rigid plate by a very stiff spring. Force applied is Negative Z (in direction of gravity). The displacement of component is also expected to be same. The displacement of the node to which the load is applied is tracked in the plot. My Question is, Why does the displacement reduce in between 100ms and 125ms? Theroretically, it should increase as long as force increases. Any ideas what and where I should check in my model? Thank you!
  5. Hello Pranav, Thank you for getting back to me on this. I will try starting with Law2. Cheers.
  6. Hello, I'm in the early stages of orthotropic material modeling using Law12. This is new to me, so I am trying to verify that the material law works for a simple isotropic coupon. I gave identical properties for all directions and identical values for yield. I am not sure how to get the values of B "material hardening parameter" and n "material hardening exponent". Could you offer me some assistance regarding this? Also, can Law12 capture the plasticity that we see in say a simple Aluminum stress strain curve? I believe that B and n drive the non linearity but I am not sure how to effect that into the curve. Appreciate your help. Thank you!
  7. Hello Prakash, I did not find any other option but I think the extrusion maintains a semblance of symmetry on its own. Thank you for your help!
  8. Hello, I am working on design optimization of an aircraft component. I have obtained the shape of the required object using a topology optimization and am interested in refining the thickness of the part using a Size Optimization. However, I am unable to find an option to create a plane of symmetry in the DESVAR card or any other location. The results obtained from the optimization show a density distribution that is not symmetric either. Is there anyway to do this? Please let me know. Thank you!
  9. Hello, Thank you for your response but I think you have misunderstood the question. I can plot the section outputs in Hypergraph to check the results stored in the Time History file. I already have TH/SECTIO defined where needed. But the file I use as input for my sub-Model is the Section Cut file (filename_SC01). (This is done by choosing ISave = 100 or 101 in the cross section collector) This is causing a lot of erroneous loading in my sub-model that do not exist in the actual (complete) model. The best way to debug this is to understand the data in the SC file. Hence, I am trying to open and "read" the SC files. They are written in ASCII, like a Time History Output file, so I am wondering if any of Altair's software can open the data to display "readable" content. Thanks again!
  10. Hello, I have a bunch of section cut outputs (created using Isave flag = 2 in the cross section collector) stored in SC files. Is there anyway to open and read the data written in these files? Similar to how time history files can be opened in Hypergraph to plot the data stored in them. I have some errors in my sub-model that are definitely caused by my SC files. I have eliminated other potential sources of error to the best of my knowledge, so being able to "read" the data in the section cut files is essential to debug the sub-model. Please let me know if this is possible. Thank you very much! Appreciate your help. Best, Gokul
  11. George, Thank you very much for the information!
  12. Hey George, That is what I have been looking for. Thank you! Appreciate your help. I am just curious, Is there a way to work directly from a T file? It is created by Hyperworks and read by Hypergraph, so maybe it can be read in Hypermesh as well? Cheers!
  13. Hello @George P Johnson, The SC files worked for me but I also have some springs that are attached to the section of interest connected to some rigid bodies. I have TH/Spring outputs for the springs in question. I can replicate the rigid to apply the spring force but the load data is quite large. Is there any way to import large data (from a csv or any hypergraph export file) into RADIOSS or create a curve through an import? I did see some post about importing for optistruct but I do not have the options mentioned in that post in the Radioss user profile. Appreciate any help you can provide. Thank you very much!
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