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Sergio
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mecway.com/forum/discussion/490/negative-von-mises-stress
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I don´t see penetration on your model, could it be that you are postprocessing with the default deformation scale factor (92.1x in this case)? In this way there is penetration, but is a display option. At real deformation (1x) looks like there is no…
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Hi Simon and Barrti, I was able to solve also using fixed time step (0.001 second), with plastic material. In my model I just use a bilineal isotropic option with the yield and tangent modulus for a basic hot rolled steeel. What is making me noise …
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Barrti, you meant you have been able to go downward and then upward with the die? Was a matter of v8 automatic settings? If that the case can you copy/paste the step definiton of the .inp that solves succesfull? Regards
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I create a new model based on the one that is available on Youtube, but made it with Code_Aster, a very similar case. A punch, die and a blank sheet to press, and want to model the donward and upward of the punch to see if is possible also to check …
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I just make some trials, you can do for improve: Use lineal elements Include both parts of the die (male/female) More important, you cannot block (clamp) the end of the strip, the material must have some possibility of sliding, otherwise will be ex…
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Have tested the ¨New CCX element type¨ feature and found usefull, but should not be limited the list of named selections to only element selections? Or better, take the list directly from the component names?
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1) First I would try with lineal elements 2) You could try to reduce the size of elements in the contact zone, and to keep the model small and quick to solve reduce the number of elements in Y direction to 1 and use simmetry to consider the full geo…
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Victor, about memory, yes was that, I setup the highest resolution and step colors as I was using on v7... will has to change my machine :-). I noticed that you has bundled CCX 2.11, while in v7 was 2.12, have you noted some wrong behavieur with th…
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Hi Victor, nice features on the new version, thanks!. I have noted in beta 2: When we choose the displacement branch on the result tree, the Magnitude default field is showed with arrows in place of standard colors as usual If you have added short…
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In fact Optimax is different from what you ask for, because is not just curve fitting but it will drive CalculiX (or other solvers) to find the adecuate material coeficients to match a reference curve performing several calculations. I have used for…
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Try Optimax, is free and ready to use with CalculiX.
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Simon, I have never try the Linux version of Netgen, maybe in the next days as I have installed Ubuntu on a virtualbox machine. In Windows there are some crashes, but normally they are due to very bad geometry. What kind of problems you are facing?
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I remember in the Windows XP era, I had a standard model that I ran on every new workstation to have a kind of benchmarking (not using CalculiX but Zebulon, another solver), and one thing that I notice was that the state of the Windows installation …
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Have tried on a Xeon with 16 cores, but even if I setup all the environment variables to use the 16 cores, CCX runs only in 8. On the other way have ran also some problems in a bigger cluster and again, there were no big difference against my old i7…
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I agree with you, very few documentation available for such great program. One of the most usefull options/tools to me is the Geometric Doctor, has repaired lot of models that was unnable to mesh directly. Some links and an old manual of the versio…
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I have similar issues with big models (maybe half of yours), no matter if the job is launched from Mecway or command line. Guess that is a problem with CCX memory managment.
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Can you share a picture of your model maybe? I'm a little curious of how to get such big model working
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By the way, we can choose the quantity of cores used by the simulation using system variables, but is also possible limit the memory that it takes Have found this fr Windows 7, will try later on my Win10 machine "On Win7, open msconfig, then Boot …
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By the way, there are online some clusteres availables ready to solve your problem for very few money, maybe that´s a better solution for such a big model. http://feacluster.com/
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Look for the *RESTART card on the CCX documentation, I never use it but is what you need it. Regards
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Pay attention that no matter the units that you are using in your model, in the CCX custom data dialog box must be entered in meters and Newtons!
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1) If you are working with an assembly, mi advice is try to solve within Mecway using CCX as solver. In this way you will be able to hide/show every component of the assembly during postprocessing (for example to see the stress in a unique bolt), so…
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My last project using beams was a pain also, all do it entering the node coordinates for every corner, then unity this nodes to create the beams and then refine it every segment. A real pain
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I'm using constantly Mecway as a postprocessor for Calculix without problems (only has to take care of the unit as it assume that the .frd will has Newtons and meters). Surely you have a problem on the input file, my advice is that you must re…
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I'm using constantly Mecway as a postprocessor for Calculix without problems (only has to take care of the unit as it assume that the .frd will has Newtons and meters). Surely you have a problem on the input file, my advice is that you must re…
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One trick to improve the mesh is first mesh with lineal element, and then change the shape (order) of the element, so then it will add a node in the middle but not deforming the element shape to this bananas. Now I don¡t remember if Mecway have the …
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You could combine the two solids in Salome to create a conformal mesh (coincident nodes at the interface) to avoid using anything and get a perfect gluing if you are not analysing the union itself.
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True is that is a little bit confuse to me also. When I work writting the cards directly, I don't use this distance (solver takes a default value based on element size), but now I don't remeber if for using in Mecway must be slighty over the minimun…
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Could it be that if you run a simple analysis the solver tells you what element are wrong? Then you can select by element number. I don't remember having bad elements inside the geometry, they always appear outside near small surfaces or features.
