I've run a simulation with sliding contacts and am looking for a contact stress output under stress but can't find any. Is the contact stress output hidden somewhere else in Postview?
Contact Stress
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Yes, in general it is written under the velocity or acceleration field. You can check your logfile. It should say at the top of the file where and what data is stored to the plotfile.
Cheers,
Steve.Department of Bioengineering, University of Utah
Scientific Computing and Imaging institute, University of Utah
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Hi Steve,
I Checked my logfile
OUTPUT DATA
================================================== =========================
plot level ................................ : major iterations
shell strains included .................... : No
plot file field data:
displacement ...................... : displacement
velocity .......................... : none
acceleration ...................... : contact traction
temperature........................ : contact gap
It says contact traction is under the acceleration field but that shows up as all zero. There's nothing under velocity, is this where contact stress should be?
I've attached an example plot file.
I'm looking for a good measure of the contact stress and contact patch area so I can assess the potential for wear.
Best Regards,
Cesar
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Hi Cesar,
Would you mind sending me the FEBio input file as well. I need to know what contact formulation you are using to determine where the problem might be.
Thanks,
Steve.Department of Bioengineering, University of Utah
Scientific Computing and Imaging institute, University of Utah
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Ok, it seems that FEBio is not outputting the contact traction for the facet-to-facet sliding method. I'll have that fixed the next time I upload an FEBio executable. In the mean time, you can try the "sliding_with_gaps" contact method which does store the contact tractions. Just change the contact definition in the xml input file to
<contact type="sliding_with_gaps">
That should do the trick for now.
Cheers,
Steve.Department of Bioengineering, University of Utah
Scientific Computing and Imaging institute, University of Utah
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Good catch. The reason is because FEBio stores the Lagrange multipliers that enforce contact which are zero when the augmented Lagrangian is off. This should be an easy fix though, so consider it fixed.
Cheers,
Steve.Department of Bioengineering, University of Utah
Scientific Computing and Imaging institute, University of Utah
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