Contact analysis "command line options"

Question

Referring to the attached file, page 22, i would ask if someone could tell me how insert that commands (contact_penetration; contact_nr_its) and also the enviroment variable ( MSE_CONTACT_TOLERANCE_FACTOR).
 
Furthermore, I would be pleased if someone could give me the guide lines to solve the contact problem in the second attached file.
 
I've already faced this problem recently, but I've never known if I done all right. The semplifications in the geometry are made because the lower part of the shaft don't move; indeed, if you look at the suppressed parts, you look other bushings that constrain the shaft.
I'm interested know the contact pressure between shaft and the highest bushing.
 
In the end, some questions about contact interfaces:
- Slit surfaces: is it always reccomended to check it?
- Generate compatible mesh: all the times I've checked it, I had some convergence prolem. So..?
- Kind of references: surface-surface or component componet. Are there any differences apart the convenience of pick reference? And, in case of comp-comp, in base of what I have to choose "separation distance" and"angle"?
 
I work in Creo 2.0 and the file are made in that, but i have also the WF5.
 
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SylvainA. · Accepted Answer

I finally found it !To use these command line options, once the analysis is created, you have to select Run>Batch... instead of starting it within Pro/Mech.Pro/Mech will then create a batch file which has to be modified in order to add the command line option.As an example, I have added the contact penetration option here:.............call "C:\Program Files\PTC\Creo Elements\Pro5.0\mech\bin\msengine.bat" "Analysis_name" -i "Analysis_folder" -w "Temp_folder" -solram 1000 -ascii -modeltype mda -num_threads ALL -contact_penetration 0.001Then you just have to launch the analysis by double-clicking the *.bat file. (if Pro/Mech is still running, you can look at the run status in real time)

SylvainA. · Answer

I don't know how to add commands, but the environment variable has to be set in microsoft windows.

It depends on Windows version, you can find some help here: http://www.computerhope.com/issues/ch000549.htm

I can't open your file but I personnaly often use split surface and generate compatible mesh without convergence issue (what kind of convergence problem do you encounter ?)

I don't like to use the component-component as it creates contacts automatically and I like to know exactly what I am creating.

The separation distance and angle are used by Mechanica to choose whether it will create a contact between a set of surfaces or not.

As an example, if you set separation distance to 0.5mm, it will create contact between all surfaces separated by a distance less than 0.5mm.

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