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@disla, can you be more specific about what's not right? I'm not sure what the different cases in the screenshots are showing or what's wrong with those graphs.
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Hello Manuel 1) It can be linear. Even if the displacement is large, linear is still OK just to see if its doing rigid body motion. 2) You can use a separate displacement constraint to constrain each translational DOF and a separate node rotation …
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Sent it! I wish I'd waited though because I'd love Eastbourne - fanciest neighborhood in my city. Not sure what a Bexhill is but it sounds old
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@DaveStupple. Oh, that's not right. Do you mind sending me the .unv file to try to find the problem and fix it for the next release?
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@disla. I see. Two hydrostatic pressures with different gravities is more conservative than one hydrostatic pressure using the summed gravity. I guess this might be a problem best solved by a (not yet existing) feature to sum solution values across …
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@disla, that's interesting regarding multiple gravities. Perhaps it doesn't make physical sense to sum accelerations? Do you think that might cause some sort of impossible/incorrect/ambiguous situation? The multiple gravity loads are internally sum…
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It's possible that you might be able to just drop in nglib.dll and all its dependencies to the ngmesh or ngmesh6 folder in Mecway. However, I've made some small modifications to Netgen to make it compatible with Mecway so it might not work properly.…
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You could use nonlinear static analysis for this. If you know the points of contact with the ground, you could put displacement constraints there and a non-zero displacement at the lifting point. If you don't know them, use contact. If you just wan…
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I don't think so, sorry. You could get thickness using the API but then it's not available for putting into a field variable. 3 material properties are available for formulas - density, E, and specific heat, so if you're not using those for what th…
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I find it solves with CCX_PARDISO.exe 2.17 dated "niedz., 26 lip 2020 19:57:20" but not with the default CCX.exe 2.17 included with Mecway dated "Wed Jun 16 14:14:29 2021". It may be too big.
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You shouldn't have any unconstrained degrees of freedom in static analysis. So no pendulums or chains. Either use dynamic response for that or nonlinear static and lower it into equilibrium position in a quasi-static manner such as by constraining i…
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Element properties -> Truss is set so they're not really beams. However, CCX beams do have a bunch of problems. From the Mecway manual: "The CCX solver (2.17) has some bugs with beam elements. Non-zero displacement constraints on beams can caus…
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Especially thanks to @prop_design for nagging me about this bug when I wasn't believing it existed :P
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Hello @mathiasf. I've put my compression-only structure into your model. Adding Flexible joint on beam to both ends makes the whole little assembly behave like a single compression-only truss element. The spacing between the two middle nodes would …
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There's no technical reason why it couldn't be there. You can arrange beams to connect to the opposite ends of the tension-only member though it's a bit fiddly. Here's an example that also uses an artificial beam with extreme section properties to…
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That seems pretty poor. Here's my result for: * simple_cube.liml * CCX_PARDISO.exe that shows date "26 lip 2020 19:57:20" with the MKL dlls in Mecway 14. * OMP_NUM_THREADS=12 It's using multiple cores the whole time.
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If the contact surface is flat, you can use Solution -> Surface integral on the contact stress pressure solution variable and the slave contact surface. Here it shows 1098 N which is pretty close to 1100 N. If the contact has friction, do it a…
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You can add the EXPLICIT parameter using CCX -> Modify keyword, *DYNAMIC, Set parameter Name EXPLICIT like in the attached example. This example doesn't solve very well and I don't know why. Maybe the time step size is wrong. Also beware that p…
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Also make sure the mesh is fine enough. You can check that by putting a local refinement at a point on the interface and see if it makes any difference to the stress there. As JohnM said, make sure the curved surface remains curved when you do this.
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With MKL, also do option 3) here https://mecway.com/forum/discussion/1012/improving-performance-of-ccx-solver which is copying over extra DLLs to enable CPU-specific optimizations which speeds it up over the basic set described with the source code.
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Hello bailey_rowland. That should work as you expect. Can you attach the .liml file to check for problems? Some ideas: Do the displacements match on the two parts? (use deformed view) If not, the bonded contact might somehow not be working at all.…
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There's a minimum element size of a few microns for CCX. You likely need to scale it up and imagine different units for everything to compensate, unfortunately.
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In case you find the liml format that Mishal suggested too complicated, you can also use CCX/Abaqus .inp format. Here's an example with 4 nodes, 3 beam elements, 2 force loads, and a partridge in a pear tree: *NODE 1,0,0,0 2,1,0,0 3,2,0,0 4,3,0.…
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For the elements being expanded to solids, you can add the OUTPUT=2D parameter to the *NODE FILE card so they'll appear as 2D shells in the solution and with the same node numbering. Add a CCX -> custom step contents containing *NODE FILE,OUTPUT…
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Could you be a bit more specific? You can model soil pressure that varies with depth by entering a formula in the pressure load. For self-weight, add a gravity load and specify density in the material properties. Use Nonlinear Static 3D analysis …
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Hello Yang That error message looks like it comes from this c code: if ((msgFile = fopen("spooles.out", "a")) == NULL) { fprintf(stderr, "\n fatal error in spooles.c" "\n unable to open file spooles.out\n"); } so it suggests some gene…
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This problem often happens when the temperature gradient is a poor fit for the quadratic elements. That often occurs at abrupt temperature differences like what you may have between the 140°C seal bar and the 20°C initial temperature of the lidding …
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I'm not aware of any cases where the internal solver gets stuck forever. It can take a long time at some steps but it should eventually either succeed or fail with an error message if you leave it long enough, which could be up to a day. Just a tho…
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Thanks prop_design. With a lot of help from you in finding bugs and advising on some domain knowledge.
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14.0 final released and on the download page. As well as the Spanish manuals, there are now also Portuguese translations at https://mecway.com/product.html
