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JohnM
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@Fatmac, interesting input, thanks. I ran with the gap and I noted that it had less initial iteration steps. Your gap gets around Victor's "initial contact step" stuff by not having contact to converge at time 0. He inserts *STEP *STATIC,TIMERES…
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The attached example has the following behavior- If you preload the bolt with a force, it holds that force, even after the plates are being pried apart. Once the pry load exceeds the bolt preload, the plates separate and the solution crashes. This …
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I ran it in 2.20, it wanted the auto time stepping like 2.23 or it would not converge. I would believe the results the required the better time stepping. If you run the executables availailable on dhondt.de, switching to PARDISO in CCX Modify keyw…
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For radial displacement input in a hole you can also use Frictionless support with a non-negative value.
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I haven't done this for a living for over 15 years so I might be a little rusty. I used the Mecway cyclic symmetry feature, put your DLOAD in the custom step contents and changed how you hold the hub. Strictly speaking your load is symmetric so you …
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You are using the Mesh.Algorithm=11; trick which I thought was my secret I also set min/max very close 399.9 / 400 to improve the likelihood that meshes will match if the CAD is disconnected in spots - it's usually easy to merge up.
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ChatGPT apparently knows what works We've been Mecway users for a decade, former big box users, no regrets!
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Can you calculate the direction vector from the 1-2 coordinates?
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Nice.
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What you can do is import this "model", right-click and "Copy Meshing Parameters To" to use these parameters on your real step files.
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Seeing all the great OpenRadioss finds, I thought it would be a good time to share a nice trick. If you keep a folder structure of useful things - materials, pre-made parts, and useful custom commands, these can be saved as "command only" liml file…
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This is strange: I meshed the test part in FreeCAD using the Gmsh mesher and the problem went away:
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Found the trick- create a node set in Mecway, run for a second and then look at the NUMBER of the node group created - in this case "1" for the wheel. Then use the /2 switch in the command to say "I am specifying a node set number".
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I can get the wheel to spin (and not the block) if I specify a node list - 1 74 - but I am in the syntax swamp when I try to create a node set with grnod and use that list. Anyone?
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I caught that, trying INIVEL for now. Thanks!
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@Victor the -z x trick worked great! Thanks.
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@fatmac thanks for taking a swipe at this, unfortunately the "real" problem won't lend itself to a linear velocity. What I think I need is the equivalent of an ANSYS "DOMEGA or OMEGA" command to impose based on the center of rotation. You can ignore…
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With all this fine discussion on OpenRadioss I thought I'd throw in one that is puzzling me, hopefully someone has some input. The attached model is a pinned hammer and a stop. I apply a torque as shown and accelerate the hammer to impact the stop.…
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If I get your question, I would do the following: In Geometry, select a surface, then right-click and add surfaces to a new named selection. In Components & Materials, click on your named selection under Named Selections, then click the "Element…
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You will also find this forum very useful for both new and experienced users. I use the search tool often to look back at old posts with good information.
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Might not be what you need, but might be an idea starter.
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@Victor thanks for the tips, but if you've never clicked a Lego toy together we have bigger issues to discuss here....
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@victor, I used to know how to post animations (I must have overwritten that spot in my brain so I could learn openradioss. But real question- "real" Legos have that wonderful click that preloads them into place. Is there a way to create this in op…
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If anyone is handy with OpenRadioss, I'd like to understand how to get an contact to initialize. Legos click in place, and really can't do what I show in video below.
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Too much fun not to share
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@disla I just tried it, very cool. Many of our sector models are looking at developing contact and friction. I think this approach would not apply, correct? It is Static, does not allow time stepping (I think).
