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About carlosmarbo

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  1. Ok Premanand, I have ensured that the material orientation of each ply is properly set. However, the results are still the same as in the picture I attached. I would say that, in a 4 Point Bending Test, the strain in the Global X Direction should be something like in the following image, which is what I get for the 0º plies: That is why I am not completely sure I'm seeing the results in the direction I want (Global X) or in Material X (which is rotated 45º from Global X). Thank you very much, Carlos
  2. Hello everybody, I am currently simulating a 4 Point Bending Test on a rectangular Sandwich Panel. I'd like to prove Navier's linear strain distribution with it. My question is: when I visualise the Composite Strains (or Stresses) in Normal X or Y directions, which coordinate system do these directions refer to: the global one (1 in the picture I attach), the elemental one or the material one (2)? I have plies at 0º and 45º orientations and I wonder whether I can compare the results for each of them straightaway by checking the Normal X Strain in each ply, or otherwise I need to apply some kind of rotation to do so. Thank you very much, Carlos
  3. Hello Mr. Suryavanshi, this method has proved to be really useful when using shell elements. I have been investigating it through the weekend and I learnt how to use it thanks to this video: http://www.screencast.com/t/oLcdJC8jH. I can now assign the most important direction to the material coordinate system of 2D geometries and the other two are automatically determined, because one is in-planar an the other one is normal to the analised surface. However, it doesn't seem to solve our problem, because we would need to assign at least another direction to define our 3D material properly. Do you know whether this tool is still useful for our case? We have also tried a feature in Optistruct named Orientation Review (available in the Tools menu). This video by Mr. Ponginan introduces it: https://altairuniversity.com/learning-library/orientation-review/. By using it we can see what the material orientation is, but we still don't know how to change it. Thank you very much for your reply, Carlos
  4. Dear Jan, I have more or less the same problem as Pieter did. I'm trying to simulate a solid geometry made of aluminium honeycomb. The use of 3D elements is required to represent its shape adequately, and I need to orientate the material's anisotropic propierties properly. Is the method you suggested Pieter also valid when using 3D elements? Is there any alternative for this case? Thanks in advanced, Carlos
  5. Hello everybody, We are trying to simulate a honeycomb component with OptiStruct. Our geometry has complex curves, as we illustrate in the attached drawing. Given that the geometry has so many irregular shapes, we need to ensure that the strong directions of the material’s elasticity moduli (E and G) are always properly orientated (direction 1 is longitudinal and direction 3 is always normal to the surface, as we show in the image we attach). We know how we should do it if our geometry was flat or had few orientation changes: we would define a new coordinate system and assign it at the CORDM option in the PSOLID card. Due to the constant orientation changes in our geometry, this option is not valid for us. How could we solve this issue and ensure the properties are always correctly orientated? Thank you very much. Kind regards, Carlos and Núria
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