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Victor
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That's a good point. There will always be some difference in their normal displacement due to the contact stiffness. If you think the error is too high, then increase that. Beware though that it's only the normal displacements that should be equal.…
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Just in case it's something simple. Is that 10 in the lower left corner the deformation scale factor? If so, change it to 1 through Solution -> Deformed view settings for the accurate shape.
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That looks a lot more fun than physics class! Thanks for posting it.
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I don't have a solution but a few suggestions if you're going ahead with explicitly modeling the slings. CCX shells can be finicky with rotational DOF constraints as well as some connections between shells where thickness or orientation change. The…
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hamit, could you post the .liml file?
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No, sorry unless you open the .msh file using File -> Open/Import.
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I've simplified that code and got it working in Mecway. I think the key is to specify the full path to the STEP file. Here's the code to add to Custom Gmsh Commands: SetFactory("OpenCASCADE"); a() = ShapeFromFile("C:\Full\Path\To\bracket_assy.STEP…
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I've tried to solve it and, like you say, it still didn't work. It does look like the contact stiffness might be the issue because it can solve with small loads before contact occurs. I got it working on a with a coarse mesh by making these changes:…
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I'm not sure what the convergence graph looks like for excess contact stiffness, but it could be that. However, the contact stiffness here looks reasonable (10 E/t). Did you add more constraints to both parts? If not, then I wouldn't expect to get …
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A couple of problems: A ) The contact won't be working because one surface is on the outside of the outer tube, instead of the inside. It probably happened because when you select a surface in the geometry view, it only allows one side to be chose…
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Thanks for working that all out. For your questions: I don't intend to release any more 32 bit versions of Mecway. It'll be difficult now because I've removed some of the 32 bit code. Mecway is supposed to work with .NET 3.5. However, on Windows …
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Yes. You can use Nonlinear Static 3D analysis type with the CCX solver. To join the plates, you probably need edges of the mesh along the boundary of the weld then you can join them with bonded contact or merged nodes if the have the same surface me…
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Older versions are currently available at: 1 https://mecway.com/download/oldversions/mecway11.msi 2 https://mecway.com/download/oldversions/mecway20.msi ... 9 https://mecway.com/download/oldversions/mecway90.msi 10 https://mecway.com/download/oldve…
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This is quite an effective force amplifying structure, so expect the bolt shear forces to be greater than the applied force. In FEA, external force accurately balances the applied forces regardless of the mesh density or number of nodes constrained…
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You can use external force in the solution to show the reaction forces on the supports. It sounds like the X components of those are the shear forces you're looking for. Beware that these aren't simple supports, but have fixed rotations too. To mak…
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Turns out this is a bug in Mecway, not Netgen. Thanks for discovering it. It happens with this combination of settings: Surface mesh, Quad dominant, Quadratic elements, and not Fit midside nodes to geometry and only if the resulting mesh has a mixtu…
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I've never seen that before, but is it that the midside nodes aren't connected to their adjacent elements? If so, then perhaps mesh it as linear elements and convert to quadratic afterwards. Otherwise, I would try Gmsh which is generally better tha…
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Version 13 will have the FREQUENCY option.
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Wow, self-contact was just sitting in plain sight all this time?
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1) Yes, you can scale it like that. It might still appear as 114.173 inches afterwards but you can just change the display units to get back to 2900 mm. 2) Either: * Use the CCX solver (Analysis settings -> CCX) or * convert to Tri6 (Mesh t…
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It does all those things (STEP, STL, assemblies) but there can be difficulties. Assemblies in particular are inconvenient because you usually have to split them up into separate STEP files, or possibly combine them as a single "thing" (not sure of …
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Thanks for showing this Sergio. It looks great! Especially where the edges of the holes meet the surfaces of the studs. What is the key setting that makes it work? Is it related to that Box and Sphere or are they just the leftover things you menti…
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I don't think there's any problem with shear locking. But in case of related issues, you can change to reduced integration. CCX -> custom element type, select Quad8 and enter S8R in the CCX element type box.
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The mode 0 seems to be the solution from the static analysis used to obtain the geometric stiffness matrix. I don't think it should really be there, but it might be helpful to confirm the loads are being applied correctly. I agree that choosing the…
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A few comments: You don't need density for buckling. Though the eigenvalue equation is similar to the one for vibration, it uses the geometric stiffness matrix obtained from stress instead of the mass matrix. Curved shells are OK with the internal…
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Mecway doesn't do midplane extraction from solids. Some alternatives: * Using the surface mesh you have, delete the extra surfaces, leaving only one. Use Edit -> Edge detecting selection to easily select large curved surfaces. If the offset fr…
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I tried implementing the example from that link and it only gives me positive buckling factors. So I'm not sure if it was ever really a problem. Model attached. There is a bug in CCX (bug 26 here https://mecway.com/product.html#bugs) that causes ne…
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Like this attached picture. It's a bit of copying and pasting, but no calculating. That happens to be a unit length edge with a unit load, but if the length shown by the tape measure is, say, 1.23 m and you want a force of magnitude 4.56 N, then in…
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I don't remember that. Maybe for element orientations? One workaround though is to find two nodes that lie on a line in the direction you want, and use the tape measure on them. That gives the x,y,z components of their relative positions which you c…
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Wow, and they did it all simply with the equation J=0 and choosing a color. I imagine transforming the Jello field J into a displacement field and an image was so obvious to workers at Pixar that they didn't think to mention it :P
