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JohnM
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Try node-surface coupling option, it generates a rigid region similar to spiders.
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The attached example problem demonstrates this use. I just ran it in the latest Mecway 13.1 using CCX 2.17, and it seems to work, but check it yourself to verify.
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Use CCX custom commands below. Ramp may not be necessary, just example. *AMPLITUDE,NAME=Aramp 0,0 .1,1 1,1 *DLOAD,AMPLITUDE=Aramp rotor,CENTRIF,10000,0,0,0,1,0,0
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The pinned support holds the beam at 1 location in X,Y,Z. The beam can still rotate in RX,RY,RZ direction. The force that is applied puts a moment on the beam, rotating about the pin joint which has no torsional stiffness, and it blows up. The n…
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I downloaded from the Calculix Discourse group, it is compiled by 3rav
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Went through things a little more methodically, and here is my best current recipe on my 8proc laptop. PASTIX + all DLLS from PARDISO OMP_NUM_THREADS=6 (8 ran 20% slower) OPENBLAS_NUM_THREADS=1 (helped by 8%) PASTIX_MIXED_PRECISION=1 (helped…
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We now run with the PaStiX ccx.exe available on the CalculiX discouse blog. I typically see about 30-35% speedup over PARDISO. I tried OPENBLAS_NUM=1 and 4, it seemed to run slower. I deleted and it ran the fastest. I also noticed that OMP_NU…
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That's great. Are you using the pastix that is available for download in the Calculix forum?
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Go to the Mecway YouTube channel, there are examples from SimCommons, 4P Ingenieria and VMH that demonstrate capability. SimCommons examples all run in under 1000 nodes.
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I will add to what Sergio said - if you do not have standard samples, use some version of the actual part (if available) and load in a similar fashion to the actual application. For example, an O-ring would be loaded in compression, but an inflatab…
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Gluing some "stiff" elements to the load point allows you to distribute the load from a single point. Think of it as a poor-man's rigid region constraint. Victor has added some features recently that may do this for you, but I still use this trick. …
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I second Victor's comment about the displacement versus force. If you model a stiff "holder" where the load is currently applied, you might be able to use a single displacement, which is very handy for post-processing. Convergence is very sensiti…
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Those last few posts were a fun read, and good to see a happy ending. I can relate to the trials that we have to go through to make things work sometimes For doing coefficient fitting with hyperelastic materials, I have found a neat (and free) piec…
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Time to go computer shopping...
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Same here with PARDISO, I'm hoping someone feels inspired to compile the new PaStix for Windows, I will be happy to test :-)
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I just ran - looks like Spooles is your problem. CCX simply stopped after 3minutes, no error report, Solver exited without a solution.
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I ran on ccx_pardiso_dynamic.exe using 6CPU machine is 17-4790CPU @3.6GHz 24GB RAM ran okay in under 2minutes. https://drive.google.com/file/d/1TgP01C-XBwdcrqXgCE1HR51hhS4WcePh/view?usp=sharing
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I use TetGen, it will create meshes from some brutally ugly surfaces, and also has some useful error checking. I believe this is the mesher used in LS-DYNA.
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Victor has put a Lab in place at 13.1 that I am finding very useful. Often we have a model "all set up" and then we want to look at the effect of tolerance or what impact a small modification might make. In these cases, try this: 1- Read in STL she…
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Strange. I loaded the tutorial into Mecway, added the missing commands from the original inp file. If I run, Mecway will crash. But if I save the Mecway model as a CCX run file, and then submit directly to CCX, it works. (LEFT is ORIG CCX, RIGHT is …
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I have had to reconcile things like the BOLTCALC program, or weld stress calculators, spring stresses, microprocessor junction temperatures. The issue is the same - there is a "handbook" approach and then the FEA result. In most cases I have found…
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Nice. I might have to download that bloated 2GB Salome file and try one more time
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Here is a "kit" that should get anyone going with the batch trick. The attached model is a simple contact test that expects a file called input.inp. The model outputs a file called out.csv Create a run.bat using the following inputs: echo off ech…
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Set up a custom model input with *INCLUDE,file=input.inp. Click the appropriate CCX "don't includes" to suppress your contact commands Use Table to capture key outputs. Include a "save model to" as well. Create an input.inp that…
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Modeling solid bolts is worth the effort. It's possible to model a fairly coarse solid bolt that behaves well. Use the Library feature to keep pre-built bolt models handy. You can import, rotate, drag into position and stretch pretty easily. You …
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Nice.
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It's the best way to demonstrate the undo function
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You may find it worth your while to look at OpenFoam for fluids. It is open source and extremely powerful. Some useful links: blueCape Windows-based version http://joomla.bluecape.com.pt/index.php?option=com_content&task=view&id=95&It…
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We use Mecway to perform basic fatigue analysis. The slide and notes attached shows the basic idea for high-cycle fatigue for typical engineering materials. I don't expect this to be the "lock" on how to do this, but it is a good start. Our curren…
