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April 25, 2024 at 3:23 pmSTAVROS PAPIGKIOTISSubscriber
Hello ! I would like to ask for help for configuring this simulation in Workbench.
The problem is a contact between a hemi-sphere and a plate in which I want to evaluate stresses and contact radius when a downforce is applied to the hemi-sphere ,to compare to the analytical solution. I am simplifying it to a 2D problem with symmetry.When I have a frictionless model I get Hertzian contact stresses.But when I put friction in it ,instead of JKR ,MG or DMT model , I get again  the Hertzian model .I don't know how to continue. Here is the result where I get the von Mises stress without  , and with friction applied
Thank you and Im waiting for your response! -
April 29, 2024 at 12:57 pmJohn DoyleAnsys Employee
I do not understand your problem statement or your question.
What does "...JKR, MG or DMT model..." refer to?
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May 1, 2024 at 2:45 pm
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May 1, 2024 at 8:22 pmJohn DoyleAnsys Employee
Thanks for the clarification.Â
The coulomb friction model used in Ansys does not include local surfacce adhesion effects due to micro material intermingling and entanglement (as described by JKR Theory). Frictional surfaces in Ansys are always free to separate at zero surface pressure. You might be able to achieve something similar to JKR by defining a nonzero cohesion real constant with RMODIF,cid,13, in a command object. See Section 3.9 of the MAPDL Contact Technology Guide for details. If that does not work, you would likely have to write a customized user routine to capture this effect.
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June 3, 2024 at 1:21 pmSTAVROS PAPIGKIOTISSubscriber
See my comment below!
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June 1, 2024 at 3:20 pmSTAVROS PAPIGKIOTISSubscriber
Hello again,I tried this simulation on Mechanical APDL , and I face some difficulties.First ,I want to have as an input the Force.In this photo below , I have put an area displacement in the plate , and a line displacement (ALL DOF) in the upper line of the circle, in order to see if the contact is detected.But I do not want to do this , I want to put a force like the HERTZ model and see the stresses of both of the surfaces .
Secondly , Could u help me a little bit with the JKR case? I do not know how to use the command window, cause I work with the menu toolbar.Is it a way to achieve the JKR model with the menu only ?Â
Waiting for ur response, thanks!Â
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- The topic ‘Hertz, JKR , MG , DMT models in contact mecanics with Ansys Workbench’ is closed to new replies.
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