Accessing Contact Results

[fzanst]

Hi,
just wanted to ask if there was a quick way to access the results from a contact analysis, expecially the contact pressure. I was thinking of something like the mapdl.post_processing.nodal_eqv_stress() function where I can store the nodal values to a variable.
Thanks

[mikerife]

Hi @fzanst Yes, see the post_processing nodal_value. Here is an example of using this. Since MAPDL stores only corner node results in the result file I'll first select the corner nodes of the contact elements (ename 174).

mapdl.post1()
mapdl.set('last','last')
mapdl.esel('s','enam','',174)
mapdl.nsle('s','corner')
contact_pressure = mapdl.post_processing.nodal_values('cont','pres')
print(contact_pressure)
mapdl.mesh.nnum

Then compare to the MAPDL listing of the contact results. Unfortunately MAPDL "prints" all the contact information with the PRNSOL command.

print(mapdl.prnsol('cont'))

Mike

[fzanst]

Hi Mike, thanks a lot!
Just another quick question since you have already answered my previous two: MAPDL sometimes has problems with the auto-meshing script I wrote (shape error limits). Now this can almost be expected and occurs when I input some of the more extreme parameters, the problem is that I don't get an error notification or any info in the terminal and often think that the script is still running. I can only see these errors when I have MAPDL open. Is there a way to change the verbosity? (Couldn't find anything in the docs except for the allow_ignore and ignore_errors)

Error Example in MAPDL:

Thanks again

[mikerife]

Hi @fzanst please see the MAPDL help on the APDL command SHPP. We can turn off the shape checking [shpp,off]. There is an shpp option to change to a warning instead of an error...this might work as well (I've not yet tested any of these ideas!).

The APDL command CHECK can be used to manually run the shape checking. There is an option to select the elements that produce warnings and errors or just errors. And SHPP can turn on specific checks (instead of having them all on). So you could write a routine that turns off shape checking; meshes; then turns on the specific shape check; run the check; and echo back if the selected element set is not empty to warn yourself that some elements failed.

Mike