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Victor
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Comments
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Hello. Could you attach the 6 *INCLUDE files too? You might also try the CCX forum: https://groups.yahoo.com/neo/groups/CALCULIX/info
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It looks reasonable for the rubber surround to have the lowest frequency mode because it has a high mass and low stiffness compared to the other parts. Or is it the shape of the deformation that's the problem? Beware that modal vibration won't find…
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No, you shouldn't scale the density because the mass will be reduced in proportion to the volume. But you do need to scale the force down since you're only modelling a small part of the structure along with its small part of the force.
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Mecway still doesn't do that, sorry. I don't know of other ways.
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Two problems: 1) The elements at the center are collapsed quadrilaterals that are shaped like triangles, and all their center nodes are disconnected. To correct it, drag to select all 80 center nodes located at (0,0,13 mm) then use Mesh tools ->…
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Short answer: Ramp the X displacement by changing it from "-10" to "-10*t". Otherwise it tries to jam it into the full 10 mm displacement on the first time step and leave it there, but it somehow has trouble with that. Long answer: This is a case w…
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Is this just with kwip's one or in general? Normally, it should do that if you turn on Quasi-static in Analysis settings and specify the time step information.
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The 3 springs are to constrain the 3 degrees of freedom of the cylinder. They have pin joints at their ends so you need several: * The spring parallel to Z prevents rigid body motion in the Z direction. * The spring parallel to X prevents rigid…
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Automesh 2D/3D doesn't currently support Gmsh, sorry.
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The red item in the outline tree indicates an error. Right click it, and What's wrong to see the error message, which say to add a thermal stress "load". In there, you set the reference temperature (I guess 0 K) and all the other nodes without a tem…
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I don't know why CCX 2.10 didn't work. According to the manual, it's supposed to have a blank line. Maybe a CR/LF problem? CCX 2.13 requires a decimal point after the spring constant so it might fail because Mecway doesn't include that - maybe chan…
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The model always has to be fully constrained or it won't find a static solution. At the first time step, before it makes contact, the cylinder is unconstrained. You can solve it by putting weak springs on it to keep it from flying away until the co…
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disla: When you specify a force, it's the total force, which Mecway then distributes equally to the nodes. So use 5 lbf for 5 lb total. Usually it's better to use faces instead of nodes because that'll give a uniform distribution of force. Especiall…
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Units The STEP file imports with correct units and is about 0.08 inch diameter as shown by Mecway's tape measure tool. It might also show 2 mm which is the same thing. The STL file is in mm, not inches. So when you open it, you have to choose mm fr…
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Does the CCX Output button in the solver panel show anything? The text there is all generated by CCX. To check if CCX is producing any files: Turn on Tools -> Options -> CalculiX -> Same as the .liml file and solve again and see if any f…
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Stress usually increases with mesh refinement so make sure it has converged to a reasonably constant value as the mesh density changes. If the stress is too low then the load might be too low. Confirm it by checking the sum of reaction forces. Clic…
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The STEP mesher is a 3rd party program (Netgen) which doesn't do lines/beams unfortunately.
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The beam twist is because Mecway doesn't currently read beam orientations from unv files so it sets them all to the default, which is the element's V axis parallel to the global XY plane. You can see the axes with the Show element axes button near t…
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This sounds more like a geometry problem. I don't think FEA would help with it. The CCX solver has a capability of modelling radiation between surfaces. However the radiating surfaces have to emit uniformly in all directions, so it might work if yo…
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If you manually paste the 3 panels' contents together into a .opt file, and run it directly in Gmsh, does that match Mecway? That would show if it's those extra lines doing it.
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It's supposed to work like that. Just be careful of the options that Mecway adds in the top and bottom panels since some might conflict with your own (Mesh.Format). The .opt file sent to Gmsh is the contents of the 3 boxes concatenated together. I …
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These asymmetric solutions look very much like what you get with the internal solver if the shift point is too low. Eg 1e-7 gave the attached picture. It also changes each time you solve, like what CCX is doing. I think CCX uses ARPACK the same as …
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That doesn't sound right. Can you attach a liml file? von Mises stress is calculated by Mecway, using stress components from CCX so you should be able to add it after solving if the stress components are there. Right click the Solution branch of th…
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I can't tell but it might have more advanced features than Mecway supports. It should be a line drawing/sketch with simple shapes like line, arc, LW polyline, ellipse, etc.
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Those items in red in the original picture are for shell elements, so they won't be there with solids like this. Replace them with these by right clicking on the Solution branch: in-plane principal stress -> principal stress stress in element co…
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Not currently, sorry.
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Perhaps that was the modeler where it worked? That's meant to be OK for both CCX and the internal solver. However, the solution from CCX isn't supposed to contain any material properties so it shouldn't be possible to show the mass. I'm reluctant t…
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Mecway 7 and 8 shear strain values from CCX are different from each other. The tensor ones are labelled with ε or E but the engineering ones use γ where γ_ij = ε_ij*2. ij stands for xy, yz, or zx. I don't know any training materials sorry, but ther…
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For linear analysis, bonded contact can be on intersecting parts. Not sure what you mean by a "line contact" - I don't think two solid meshes can intersect at only a line - they would have some volume in common if they intersect. A limitation is tha…
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That should be right. Stress stiffening plus gravity specified through the Mecway interface would turn a pendulum into an equivalent spring.
