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AutoGEM will not mesh parts

Regular Member

AutoGEM will not mesh parts

I am using mechanica to analyze a set of brackets that mount to a transmission housing for support. I have everything setup in my analysis but I am having one hell of a time trying to get the transmission housing to mesh. In fact, I have been trying to get this thing to mesh for a solid week now.

Here is what I have done so far to try and get it working:

1. Turned off as many features (holes, rounds, etc) as possible to reduce the number of elements.

2. Carefully repaired all of the errors in the geometry (overlapping surfaces, etc.).

3. Ran AutoGEM successfully on each part individually (including the housing).

4. Tried suppressing one part at a time in my analysis to see if there was some sort of glitch with the analysis.

No matter what I try, AutoGEM will get 99% complete and stops without throwing any errors other than it is unable to mesh. The thing that really annoys me is that my counterparts in Japan have been able to run a similar FEA with the same transmission model and computer setup without issues.

Any ideas of things to try to get this working?

BTW, I am using 64bit Pro/E WF4.0.

18 REPLIES 18

Re: AutoGEM will not mesh parts

When you run the analysis on each part individually do you get any warnings in the diagnostic’s window?

If you do, this might lead you to the culprit. Also check your material properties for each part.

Hope this helps,
Don

Re: AutoGEM will not mesh parts

I succesfully meshed each part individually and did not receive any errors, only some warnings about edge angles. I also verified that all parts have a material property so I don't think that is it either.

Any other ideas?

Re: AutoGEM will not mesh parts

I have run into issues with surface warnings at the part level that would not let the assembly level analysis mesh.

Verify there are no surfaces created by rounds or blends that fold over it's self.
When you do a tolerance report in Simulate are they all close to each other in values?

Don

Re: AutoGEM will not mesh parts

I checked all the tolerances and they are good. I also started checking each part individually again and finally got it to throw an error. When I try to mesh one of the components of the main transmission case, I get the following error:

The highlighted surface(s) have C1 discontinuities.

Although Mechanica cannot create exact elements on these

surfaces, it has created approximate elements that may generate

invalid results.

The only problem is that it doesn't highlight anything.

Re: AutoGEM will not mesh parts

If you set the global interface definition to "free" does it mesh?

Re: AutoGEM will not mesh parts

If I understand you correctly, you are asking if I set the global definition to free rather than bonded does it mesh? If so, the answer is no...it still doesn't mesh.

Re: AutoGEM will not mesh parts

Not sure exactly what you are asking. It is a casting model with all of the machining operations included, but I have turned off as many features as I can. The main issue is that most of the goemetry was copied as surfaces from other parts and the model is just "dirty".

Re: AutoGEM will not mesh parts

How is the accuracy defined for each part (you can check by going File -> Prepare -> Model Properties)? Relative or Absolute? This issue sounds like the mesher is having issues defining the geometry boundary with the appropriate level of tolerance.

Would it be possible for you to post your part and assembly files? How was the CAD geometry created? Did you use any free-form surfacing?

Re: AutoGEM will not mesh parts

I will when my company switches to it (our internal software only supports WF4 at the moment). At the rate we are going now, that should be some time in 2020.

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