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Found 8 results

  1. Good Evening, I have completed a topology optimisation and I am happy with results but now I want to to re-run the analysis. I open ossmooth, load the model and results, use "keep smooth layer around" and remesh using a "mixed" mesh type. I then go to run the analysis (-optskip) and I get an error message regarding compliance. I don't understand what's causing this as the loads and constraints are all attached to the non design space. Is it a mesh issue? *** WARNING # 312 In static load case 1 the compliance is negative or large 3.974381E+11 Optimization/buckling analysis cannot be performed due to possible rigid body mode *** WARNING # 312 In static load case 2 the compliance is negative or large 1.253294E+12 Optimization/buckling analysis cannot be performed due to possible rigid body mode Thanks in advance for any help, this forum is an excellent resource and has got me this far. I just need a little help with this last step. Kind Regards, Mike FRONT LOWER LEFT MODEL 2127.out FRONT LOWER LEFT MODEL 2127.hm FRONT LOWER LEFT MODEL 2127.fem
  2. Hello! We have the following problem by using OSSmooth for a FEA reanalysis: Our component is made up of a core (blue) and a shell (red/orange). The core has Hex 8 3D-Elements with the Card Image MAT 1 and PSolid. In order to create a shell around the core of the component, we used the tool "Find Faces". Thus we got a shell around the core with Quad 4 2D-Elements. We used the Card Image MAT8 and PShell with an offset to the outside T=2mm. Therefore there should be no intersection between the two kinds of elements (see figure 1). Both the core and the shell was defined as design space so that we optimized them both in a successful optimization. See figure 2: Holes and notches were created in the shell as well as in the core. Afterwards, we tried to import the optimized geometry with OSSmotth by using the following settings: FEA Reanalysis, iso surface, remesh, trias as mesh type and two layers attached. As a result the 3D-Elements has been updated according to the optimization result, but not the shell (see figure 3). Furthermore we got a very questionably visualization of the shell elements: At the attachment points between core and shell, the shell elements strangely stick to the outside and inside (see figure 4 and 5). Are there any mistakes in our settings or in the modelling? Thank you very much in advance for your tips and advices! Greetings Martin
  3. Hello, I am a student user from Canada, working on a topology optimization project for my university's Formula SAE Team. I have completed my optimization study using OptiStruct, and have manipulated the iso result in HyperView to something that I am somewhat satisfied with. I now wish to use OSSMOOTH to smooth out my model and convert it to a .STEP file so that I can open it in SolidWorks as a solid body. OSSMOOTH requires you to load a .fem file and a .sh file. I know that when you run the topology optimization study, it automatically generates a .sh file for the final iteration (and an arbitrary iso-clipped value), but the automatically generated .sh file does not contain the iso-clipped geometry that I wish to move forward with. My question is this: How do I import my desired iso-clipped geometry into OSSMOOTH? Am I required to generate a new .sh file from my desired iso-clipped geometry? If so, how do I create this file? I can't seem to figure out how to get my desired shape to appear in OSSMOOTH, so perhaps there is a gap in my knowledge about file types and how to create them. Any help/advice would be greatly appreciated! Thanks
  4. 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
  5. ian

    OSSmooth

    Hello, What is OSSmooth and what is it use for ? and what does reanalysis mean in OSSmooth? Thank you
  6. I have used OSSmooth command for my found topology but it seems impossible to re-run the analysis as it contains so many meshing errors. My element quality check identifies 4795 free edges. I tried re-meshing the whole volume and re-assign my design/non-design space but it didn't help. Is there any solution for this matter? Optimization.hm
  7. Hi, I used OSSmooth to Import an Isosurface into Hypermesh from a previeous optimisation. I want to export part of an assembly to stl, so I can't directly use the export from OSSmooth. When I create the faces from the "find faces" panel and try to export as stl. The resulting file is created but has 0 KB and no model inside. I don't know what I can try to resolve this issue as there is no error message. Greetings from Germany, Marius
  8. Hello, my question is related to a free-size optimization of a metal sheet done with shell-elements. The model is simple, because it is not for application, but to compare it with the results of a SIMP-method topology optimization. So there are no manufactoring restrictions. Objective: min compliance Restriction: volume max 30% of designspace Base thickness: 0.0 So the result needs to be interpreted, because there are void areas after optimization. I would like to do this using Isometric lines depending on thickness in Hyperview and then use OSSmooth for fe-reanalysis with the threshold-value I got from Hyperview. But when I do this, it seems like I can not get the thickness-distribution of the optimized design for the fe-reanlaysis. Can you tell me a way to solve it?
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