Tried that setting - still got many errors on check part. Probably worse than before.
Non-positive jacobean
strange when the bolt has been simplified, geometry also not too complex enough for tetrahedral mesh. Can it be more specific for all mesh setting since previous error message may related to mesh in fit to geometry?
Went back to previous mesh settings. reverted to contacts instead of constraints for where the plates touch each other (have set these to Tied for now). That got rid of the non-positive jacobian errors.
Eventually it āfails with resultsā - the results are all zero.
Biggest problem I have is that documentation is only a list of controls, it doesnāt give any detail on usage, or explain what control actually does. I have to guess everything.
Is any example of use of āAmplitudeā available? - the control makes no sense to me, and I see no way to link this to the loads.
I view it as a function f(time). You multiply the magnitude of your load (displacementā¦) by this function.
Timesteps are defined in the incrementation parameters of your step.
Check out FEAnalysts tutorials on youtube.
Any specific tutorial? The titles donāt give obvious hint as to which one might cover thisā¦
Yes, itās just a time-dependent multiplier for loads. Itās defined as a table (time vs amplitude value) first, then assigned to BC/load and its magnitude must be properly specified since it will be multiplied by the corresponding amplitude value in each time increment.
I tried removing all but one of the pressure loads to see if that would help. Still doesnāt seem to be converging.
I suspect I must be missing something more fundamental or basic with the set up.
Is there any tool or setting where the defaults might not be a good idea?
I canāt get any sort of plausible result from this - no clues from output as to what the issues might be.
To be frank, I donāt understand how to use most of the tips provided by others above.
My previous system would almost always solve, if it could mesh the model. Unfortunately it is no longer supported and wonāt mesh this model.
Since you are doing a contact pb for instance this one
https://youtu.be/IsSsUDkVlpM?si=UNXlLCWuO1RqY1kl
Thanks - what does āpbā stand for in ācontact pbā ?
OK - I have an amplitude table set up, not sure yet if that is helping.
If results are still nonsense, could anyone take a look at my file to see if there are any glaring errors on my part?
IF I can get this to work at all, I can build on it by adding pre-tension perhaps, to be more realistic.
as i know, automatic tetrahedral mesh in PrePoMax have two mesher, default is Netgen (basic) and Gmsh as alternative. At some model is not always easy to run of the box by single preset, specifically in curved geometry and contact analysis. Maybe basic CAD files provided if possible, so another user can be trying to understand about the problem by several mesh setting.
have you shared the model ?
Not yet - the .pmx file is about 155MB, so rather large to post to forum. Iāve no idea what is the accepted norm regarding upload size hereā¦
people have used google drive or wetransfer in the past
Wasnāt until now aware of option to get link from WeTransfer - always learning!
The model here is top half of of the actual assembly. It is symmetrical about the flat faces that surround the channels with Load3 applied.
Iāve omitted some minor parts whilst trying to get this to run at all.
But only 2 parts are in the model - the āchokesā were omitted.
Iāll delete them entirely to be sure and try again.
My mistake, I put them back in !
Iāll take another look.
Which PrePoMax version are you using ? I get this error when trying to open the file in v2.1.0 (seems to be created in this version but v2.1.11) shows the same problem:
