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@VMH look at new post https://mecway.com/forum/discussion/1373/easy-upgrade-tips-re-do#latest you may find useful
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http://www.dhondt.de/calculix_2.20.1_4win.zip this file is linked on the dhondt.de site, a hyperlink simply called "files"
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Nice!
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Open Foam comes down to surface preparation and selecting the right template. The SimCommons approach uses Mecway to identify different patch surfaces of an STL surface, then uses Linux scripts to pull the right template and combine with the geomet…
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The two pendulum problem is a subset of something I posted on LinkedIn recently. It's the Newton pendulum toy. It's simply a demonstration of the problem we have with time stepping. The large motion of the end pendulum coming down does not require f…
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@disla thanks for joining the dynamics misery club! All of your points are understood and appreciated. we do drop testing with CCX, we impose gravity and initial velocity, and the part is positioned a fraction of a millimeter before the floor. Thi…
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if you use a text editor to open the liml, you can remove any paths and leave the file as simply "shaft.stp", which will look in just the local directory.
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Very nice!
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We use Optimax, and it works well. We use a load cell machine (Lloyd) to obtain a load deflection curve. This test setup gets modeled in Mecway, and the C01 C10 coefficients are made variables (I think we go straight to the CCX deck at this point)…
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In the past I have used NASCRAC which creates a crack growth rate based on a stress field and da/dn material data. However, I recall there was a method in ANSYS that used higher order elements, with the midside nodes to a "quarter point" at the base…
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Ok here we go again. Attached is a simple model run using nonlinear dynamics (*DYNAMIC in CCX). We have run models this way for a while, and the process gives us reasonable design input for things like drop tests or assemblies with dynamic effects.…
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Very nice.
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4:45 PASTIX Intel i5-12500 3.00 GHz 64GB using 6 proc 6:31 PASTIX Intel i7-10700 2.99Ghz 32GB using 6 proc
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Don't overlook the new forced convection features!
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I think this is BETA but this might solve your problem in the next release:
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I will second the comments about the unpredictability of where modes might occur. Even with a mature design, someone introduces a cooling passage in a tip shroud, or a change to the squealer tip, a modification to a damper casing, and suddenly you d…
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For 20 years I worked on gas turbines, and we used cyclic symmetry in ANSYS. The blade/bucket engineers were fixated on some "classic" trouble spots, like N=2 lower modes that were damper wear issues, but we always produced a huge map of modes for …
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That does sound a little strange. I would expect the meshes to be identical, but does the offset affect that somehow? Are the messages identical?
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If you are designing a rubber collar for a rotating seal, those are the kind of things to watch for. If you are designing a rubber ball, I think you're good
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Plot your Z displacement on the top (non-impact) side of the sphere, I think you catch a higher order flexing mode of the sphere
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I use TetGen for difficult STL. It identified two small areas with self-intersecting shells, which nothing will want to mesh. Once corrected it meshed fine.
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You know the joke: The patient says, "Doctor, it hurts when I do this." Doctor says "don't do that". I have learned to avoid refining hex models that require making pyramids. I have seen things that make me suspicious of their behavior. I've not…
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If you need the right answer, put a part in that mimics the feature that is transferring the load. In the example, the collared ring actually comes out of contact and concentrates more load at the extremity. Also be careful with your frictionless s…
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The figure I shared bears out what you are saying - the cantilever with 4 layers is "almost" good enough.
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@Sergio gaskets, bushings and o-rings can do okay with hex8 in compression, but for a membrane like a balloon or with mixed bending, we know that they are too stiff. Some of the examples are "really cool", but I'm sure I will never be able to share
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@disla, @sergio, @victor - thanks for all of the input, here's update for what it's worth. We kept write frequency low, element count as low as possible, lowest reasonable contact stiffnesses, elastic support to keep things from "jittering". 14 hou…
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@sergio I know this trick, but also be careful, the hex8 tend to be stiff, particularly in bending. I find hex8 good for o-rings but less useful for a bellows. There is a SimCommons video on this, but I just repeated something similar to remind me…
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@victor, good suggestions, we do these! The model has rubber, I'll check the contact penetration on the last run, maybe we can back off some more.
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@disla, good suggestion, we do this. @sergio, good suggestions, we do these. Thanks for at least reminding me this is not a trivial problem
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