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Sergio
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Comments
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Guess that they are like the selection tools, at the begining one can be reluctant to adopt it, but after we found more and more oportunities to use it. In most cases an experienced user will not need it, but sometimes is good to have a quick tool t…
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Today I did some test to see the graphics capacities of Mecway, so I took a medium size mesh and with the refine command divide by two the size and run again the calculus to see the differences in results, and Mecway performance. First I notice a bi…
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Try hiding the element edges, or better, improving your mesh to don't have such quantity of elements for a simple model. Anyway, managing such big models can be tricky in Mecway, a little better on Prepomax, but nothing is perfect. Worst thing is …
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Back to this thread, is possible to compute stress linearization on Mecway for shell or axisymmetric elements? Have made some tests last week with no success. Regards
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I never did such comparation (lineal vs hyperelastic behavieur), but guess that with the right Young Modules and Poisson coefficient at low deformation deformations should similar. I will try tonigh with a sample to see the differences. Regards
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Nice model Barrti. One of the drawback of using CCX with beams elements, is that if you define a circular/anular section, the results will show it as cuadrangular equivalente sections. Regards
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What's the aim of your simulation? All depend on that, if you need an rough estimation of deformation, then maybe is enough. If you need to predict stresses, or durability I suggest you go further with more complex material modeling. Regards
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True is as a rubber FEA part analyst for years, I never use this kind of coarse aproximation for rubber, I always use hyperelastic with specific material coefficients. I have told to use such a coarse representation of the rubber only in case that i…
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My votes for a built in material database! I have the same problem, have started saving all my materials in one file, but then when I import it, all materials came on the actual model, and even if they lay on the unused material branch, some warning…
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For EVA I would choose hyperfoam material, is not available directly from Mecway´s interface, but you can easily setup by means of CCX custom cards. Now stiffness of foams will depend on material and density, so you must perform a kind of material c…
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Guess that the Disconect Element feature and TIE is good enough procedure for getting accurate result at the interface nodes From my point of view there is no need to worry in this matter.
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Welcome to the forum, Martin, your examples are very usefull. Normally for this cases (rubber parts) I don't include the metal part as they are not the matter of the analysis, sometimes I need it for contact or other purposses. But as you said, nod…
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Have never look for the volume variation due to loading in rubber, as the mantra for hyperelastic materials is his incompressibility. Could it be that this change in volume is due to the colapse of some elements? Have you tried with reduced integrat…
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Maybe is something related, there is a feature to compute the volume of the mesh, can be added also the weight if the density/thickness is loaded on the material? Regards
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Have nothing in Viton yet. I have contacted some rubber compound manufacturer here that could give me some samples to measure, but I'm not sure if they will have Viton, is a very specific compound. I will try to reactivate this issue during the week…
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How do you plan to represent the differen rubber sttiffnes? Viton data is not very common. Do you have measured data to correlationate?
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Victor, for making the load/deflection plot I look for the values in a .dat files by means of Excel using custom filters to remove the blank lines and other stuff in the .dat file. Now I'm trying to get at list this values in Mecway by means of the …
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I don't understand why you try to mix loading by displacement and force. Using only displacement I was able to finish the assembly (fully close). Driving the movement by force is always more complicated than fixed displacement increments. Can you …
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Be aware that in my charts, I have made a mistake. I took yuour model and remove one element in thkcness (to speed up the calculus), so I work with 0,5 degrees. Then I multiply the load reaction by 360, but should be 720 to take in count the 0,5. Re…
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As you say, Excel. But is a little bit akward the .dat format and a repetitive task. I don't remember now if there is another way of getting this data in a more clear way using TIME POINTS card.
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Thanks! Will you made something to plot .dat files in the future? Is very usefull for this kind of analysis. Regards
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Victor, on your formula for appling the displacement you took a displacement of 4.5mm, that is the actual separation betwen the rigid parts. but why at the end they don't finished completly closed? I have made it with a table directly, ramping fro…
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Try with more increments and a displacement in place of load. And for Viton and other rubbers is better to use hyperelastic materials, now available on Mecway. You can see some rubber examples made it with Mecway and CCX at http://www.4pingeni…
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Great tutorial! I have made some samples on pressure vessels these days, using Salome to create the meshes. What kind of elements is better for this kind of analysis, shell or hexas (extruded from 2d mesh)? I did some comparations using the same hex…
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There is no MT-version on the final release. I have recovered from the beta 3 and selected in the Options/Calculix window. Maybe there are some mistakes present so the author has decided not to include. By the way, why exist an option to select an…
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High end mesher as NX or even SolidWorks allow you to create midplane from solid parts (but is not perfect at all). But even for CAD modeling I use the same approach, first model as surface one side of the part (normally the one that will be in cont…
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If you want to work with shell elements, then is better to do the CAD model directly using surfaces and not as a solid. In that cases I prefer to work with one side of the model (and not midplane), and tell the preprocessador the thickness direction…
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Problem about to put the reduced integration option on mesh window (Meshing Parameter) is that if we work with orphan meshes (importated), there is no meshing parameter available.
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Are you using the executable directly or by means of the batch file provided by bConverged? In that case the batch file will set up his own environment variables also, so you should edit it to add the multiple core option.
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If you add the possibility of selecting variables to reduce the results size, can you add also some options to save results every x number of iterations for no lineal analysis? That's a good way not only to reduce the size, but also to make it easie…
