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Sergio
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Comments
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I have done the mesh in Salome. Just explode all the surfaces, then join again to make the mesh coincident at the intersections. There was one horizontal surface that was not exploded, so I divide it using the vertical ones.
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This the model meshed with coincidents nodes in Salome, now I would like to see the results!
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As is a relatively simple geometry, I would work with a solid mesh. I'm not sure how must be treated the unions between two crossing surfaces using shells. Anyway, as Disla says, with Salome you can join the surfaces and create a mesh with coincide…
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Another trick is to add an extra point at very large strain (100% strain and compute the stress for this point to keep the tangent modulus constant) in order to help to converge in case of having a very small high plastic strain hot spot in your mod…
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Hamwik, those are engineering stress/strain values, you must transform to true stress/strain to use in CCX (true stress is a little higher than engineering stress). Also, the second point of your PLASTIC card is the ultimate stress/strain, but you m…
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Sounds similar to NX "load cases". In that, you first define several loads and bc, and then create a load case dragging each bc and load to that. In that way you can create several load cases (the can even be different kind of analysis if I remember…
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I don't understand your question, if you apply the load in the center of the flange, then will appear some flexion and moments on the bolts as is not in the same direction.
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Bolt has no preload and the union start to gap?
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Is there any standard dimensions for preloading the bolt by displacement? I always preload up to 75-85% of material yield, mostly using the thermal procedure on a middle portion of the bolt flank. Normal torque procedure always remark that with n to…
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Nice work! What is the "stress_tt" variable?
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Victor, is possible to have different icons for solid and surface geometry on the tree? This would solve the confusion quickly.
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About material properties of the gasket... well I have to investigate, there are a lot of types and materials for gaskets, and they perform different at every temperature. I don't understand your material curve, is E vs Stress? You must find a way …
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You are right Disla, have checked and also I'm having only a 2d mesh. I would suppose that Mecway will give some alert as we are meshing a solid and get 2d mesh... so I load the model in Salome to find out that is only a surface, there is no solid a…
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With element size 50 I was able to get a smoth mesh. Anyway I would consider remove all the small radius of the geometry before meshing to get a simple mesh for this part. Also can be used simmetry.
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Awesome work! What material has used for the gasket? Probably you'll need more element in thikness to capture the compression effect. About video formats, I have uploaded some video capture to youtube and then just add the link here. Another way is…
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Hide the element surfaces and edges, then select node by number and you will see it in blue.
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Go to Menu/Edit/Select node by number... Regards
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Victor, what is the "Import from Library" option under Lab menu? Regards
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You are in the right track, from simple to complex things. Is a common mistake try to start with all the complexities to end leaving the project unfinished due to poor understanding or limitations on soft/hardware. About symmetry, probably is easie…
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Nice model Disla! Have you applied bolt preloading? You can do by means of CalculiX *PRELOAD card or using thermal contraction. Honestly I had best and quick results using old thermal method.
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When a say "simplify all the small features as radius" I meant delete the small radius and leave just the corners (and remove small holes and so on). Small features will not have big effect on modal results and will let you have a better mesh (less …
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You must simplify all the small features as small radius, fillets, holes that don´t affect the results and complicate the mesh. Even small parts as washers or others must be eliminated. Regards
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Nice project! I would work in the cad to get the midsurfaces, and then export every component as a single step or iges files to be meshed as shells in Mecway. Another way would be mesh as solid (but using a 2d mostly quads extruded to get hexas/wedg…
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Have checked the step, is a very bad quality shape probably created from a stl then converted to step (due to the big faceted triangled faces). In my opinion will be better to recreate the geometry in the cad because is a simple cilinder, than tryin…
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Hi Guillermo, just for check it, using CCX 2.14 I was able to solve easily your last model.
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I agree with Dave, very nice model
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As far as I know is perfectly possible, even if you don´t add or remove features (faces), the boundary conditions should keep in place. Just be sure to add the bc based on faces of the step, and not of the mesh. In case the bc were not reatached to …
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Just one tip, use three second order element in thikness, lineal elements can underestimate the deformation for sheet metal parts. Your part is very regular, can be easily meshed as a revolution mesh.
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By the way, the actual sector has a bad angle, about 9.xx degrees, so there will be more than 36 sectors. That's why in the results there is a small gap between sector, and I was forced to use the CHECK=NO option to be able to solve it anyway.
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Now I'm not remember well if is included or not in the Mecway interface, but you can add the card by means of custom CCX data on the tree. Check the attached model
