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Rusticus
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- Rusticus
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Comments
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Sergio - Thanks very much for helping me again. Per your request, I've included a JPEG showing a short section of the shaft with the two piece collar mounted to it. There are pockets machined into both sides of the collar. The pockets will hold …
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Victor - To clarify, Mecway was unable to solve using its internal solver. I am applying a centrifugal load (15,000rpm) to my assembly, so I had tried the internal solver first. I am not able to call CCX from Mecway with the centrifugal load appl…
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Sergio - Thanks for the confirmation that using Mecway for pre- and post-, with CCX on the command line as the solver, is an appropriate approach. My current problems may be units related, as I was able to open the ".frd" directly late yesterday, …
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Victor - Thanks again for the pointers. I looked at the membrane example; it used a rather implausible temperature, though I think I understand why. I back out the required temperature to induce the dimensional change which corresponds to my high…
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What is the correct workflow for simulating the pre-load by way of thermal stresses? The tutorial (section 2.4) seems to indicate the following: - run "Thermal Steady State" analysis, setting object temperature (and convection, which I don't care t…
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Victor - Thanks for further elucidating. I may need to use the elastic support constraint, since I am attempting to model 1/4 of a revolved pair of solids which have an interference fit on the ID/OD. Thus I would have nodes with both the symmetry…
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Victor - Ah, thanks for clarifying. I was worried when the font for my materials turned red in the tree view, and I interpreted the "What's wrong?" message to mean I should remove the failure criterion. My misunderstanding. Thanks again. Rustic…
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Sergio - Yes, Mecway's mesher can create quadratic elements from the outset. That's how I accidentally made the bananas. It is possible that the STEP file has too large of sectional changes, or is otherwise difficult to mesh. Victor - Thanks fo…
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Victor - Thanks for the guidance. Not being familiar with CalculiX, I wasn't too sure what would happen when using the TIE option. I will experiment with the thermal stress approach. I'll poke around in the Mecway manual, and maybe some CCX docu…
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Still replying to my own posts. As Sergio suggested, I did try various tolerances in the "bonded contact" constraint, over 9 or 10 orders of magnitude. What seemed to work "best" (meaning, no warnings were thrown, even in the "WarnNodeMissTiedCont…
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As a follow-up to my own post (bad form, I know!), Sergio has elsewhere suggested to me that I try using the TIE option in "bonded contact". This option only becomes available when the CCX solver has been selected in the Analysis settings. I hadn'…
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Sergio - Hmmm, I don't feel quite ready to dive into the cards, just yet. No doubt that day will come. Again, many thanks to you. I'll play with the tolerance value and see if I can discover something which seems to solve without throwing (so ma…
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Sergio - That may be the way to do it. I'll try that out. When I meshed the STEP, I had more than a dozen bad elements. I could see them on the screen, but couldn't figure out how to select them, except for a couple which were on the surface. T…
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Sergio - Thanks. I followed your suggestion (I didn't realize the TIE option appears in the "Bonded Contact" constraint once the CCX solver has been selected, but now I've got it). Do you have suggestions for an appropriate tolerance? I selected…
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Victor - Which "characteristic thickness" is appropriate? That of an element, the thickness of the part (in one direction or another), or something else? TIA Rusticus
