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Sergio
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Comments
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Thanks @Fatmac , I thougt that would be included with the last releases of Mecway.
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Our local compiler hero!
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Did you try to import to FreeCAD or other CAD and see what happen? OPEN CAD STUDIO is a very new project and things can be a little raw for the moment.
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For the cyclic simmetry using the internal solver the node lay out must match exactly between the two faces, I have created a rotated copy of the model (60°), and found nodes that doesn´t match, so that could be the problem. I recomend you to cut th…
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Could it be that your model is an 80° slice?
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Looks like there is an error on the file, can you check and upload again?
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Can you upload the step model maybe? I have tried with a similar assembly imported in step format to Gmsh, mesh with default settings (only size adjusting) just pressing the Mesh 3D button and saving the mesh, and was imported in Mecway as tets (sep…
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As a beam model is a simplification of 3D structure, I would just create 2D elements between the center nodes of the hollow beams, all with coincident nodes. If I need to get more accurate stresses would replace with shell elements the hollow beams.
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@Victor, I have run the model (and others from mine) from @JohnM , with bolt pretension based on force and equivalent displacement, but the final displacement in the deformed zone doesn´t agree with the defined value, is there a way to make it agree…
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Hi Victor, would be great if the postprocessor view show the solver and version used, now that there is Mecway/CalculiX/OpenRadioss/Mystran available that could be a usefull information.
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You could mesh your part using estructured hexa elements, in that way you can put for example two elements in flange thickness of the beams. Otherwise you can use shell or beams elements. Check this two examples Skid analysis using hexa meshing h…
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Another tip is create an empty file with the common materials used in your simulations and use as template, most of the industries works with few basic materials, and for static or modal análisis all steels/aluminium/casts are the same.
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Take a look at this two examples, the first one is the more easy to solve, the second one rarely converges with real models.
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Just use slide/open contact between the two bolted plates, and bonded/tie between bolt/nut head and plates. Otherwise will take a lot to solve, if it works.
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Change your analysis type to static 3d, unsuppress the frictionless suports, add a thermal stress bc, in the solution branch request displacements, stresses and reactions forces and solve again. Could you please upload/share the beam model and the r…
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Hi Victor, thnks for this update. I have installed and there are some visual glitch in the pretension bc. I have applied in several horizontal bolts, and they are represented in the center position (paralell to X), but for the vertical ones (Z direc…
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Hi @polymathic I have tried to mesh your part in Salome, and looks like the surfaces have some errors, such as the edges of some faces are not shared or coincidents with the adjacents, very different to what I see when I model with standard CAD tool…
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Thanks! I tried installing Mystran with the 29 version and didn´t work, results were not imported, will try again now. In which cases Mystran would be better than Internal, CCX or OpenRadioss solver? The only thing that came to my mind from my days …
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@JohnM nice trick! Did you find a way to save also custom meshing parameters for Gmsh? There are two sets of parameters, one for meshing conformal parts and the other to meshing with quads that could be great to save. Maybe could be saved at least a…
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Can you share the geometry file?
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@Victor about deleted elements in OpenRadioss, the new version of CCX has a new damage initiation models with element deletion also, based on plastic strain, so maybe if you implement something to deal with those elements in Mecway, the feature coul…
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Great update. The "copy mesh parameter to.." is a nice feature, could be implemented something similar for material assigment?
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Hi, by the way there is a mistake in the material definition, I took your same values but the unit is wrong, so check it before any conclusion. About durability on rubber, I work for that years ago, we use maximun principal stress (Principal Stress…
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I have re meshed with Gmsh with special sauce (parameters) to get only quads, and now we can reach up to 80 mm deformation before the solver stops. I have refined manually the mesh in only one radius (because all are similar, cannot make it work wit…
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Did you try to replace the c channes by beams? About meshing the C channesl, you can just mesh the C shape with very few line elements, and then extrude (to create quads) along the lenght of the channel choosing the number of elements that you want/…
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Hi @Fatmac , did you see the cases 4 and 6? I did others cases and agree very well
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As far as I remember the .frd doesn´t keep that group information, is Mecway that creates that relationship. If you work outisde Mecway the importer probably cannot make that relation again, even if you have imported before the input file. Using P…
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There is a specific boundary condition in Mecway/CalculiX called Pre-Tension Section
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If you think that there will be contact between de bolt body and hole, then you need to apply contact with separation at the two bolt and nut heads and plate to allow the slippage, otherwise the TIE will prevent the internal contact. Also add the bo…
