General Mechanical

General Mechanical

Contact (not / allowed sliding)

    • jonsys
      Subscriber

      The picture below depicts a flat pane, in which a force is applied in order to bent it into the mold (brown) arched shape. The pane will move, while the mold is a rigid body. The contact defined between them is frictional. While they touch each-other, I want the pane to be able to move freely along the longitudinal axis of the mold, but not move in global y-dir (eg. not slip from the mold).


      Do you have any suggestions?


      Regards,


      1

    • Sandeep Medikonda
      Ansys Employee

      Jon,


        Starting in 19.1, If you are using multiple load steps, you activate or kill different contacts using Contact Step control as shown below (in previous versions this was done using an ACT extension):



      Another way of modifying contact is by using the KEYMODIF commands (snippet),


      For example, if you want to specify a standard contact with friction coefficient = 0.1 then issue the following command:


      keymodif, cid,12,0! Define Standard Contact
      mp,mu,cid,0.1 ! unitless
      keyo,cid,2,0 ! augmented Lagrange
      keyo,cid,4,0 ! on Gauss point (from Program Controlled setting)
      keyo,cid,9,0 ! use real geometry with stepped effects
      keyo,cid,7,0 ! No Prediction
      rmod,cid,3,1. ! FKN
      rmod,cid,5,0. ! ICONT
      rmod,cid,6,0. ! PINB
      rmod,cid,10,0. ! CNOF
      rmod,cid,12,0. ! FKT
      rmod,cid,36,30 ! WB DSID

      Where cid is the contact element id. You can learn about the KEYOPT for different contacts in this help section.


      ~Sandeep

    • jonsys
      Subscriber

      Hello Sandeep,


      thank you for the reply.


      well, I am using 17.1 as shown in the picture. I am applying the load in multiple load steps, but I want the contact to be the same in every load step (meaning I don't want to kill any contact during the time).


      Probably I lack many ansys skills, therefore I didn't clearly understood your answer, but can you please explain it more specifically?


      Regards,
      Jon

    • peteroznewman
      Subscriber

      Jon,


      Adding a Y = 0 Displacement support to the faces that are the "edge" of the pane will prevent that edge of the pane from moving in the Y direction while allowing it to freely conform to the mold in the Z direction and slide along the mold in the X direction.


      Does that satisfy your need?


      Regards,
      Peter

    • Sandeep Medikonda
      Ansys Employee

       Jon, Adding command snippets is adding APDL code to the object of interest. But, I probably did not understand your question properly and it looks like you don't need all the unnecessary complexity of dealing with command objects in this case. Please try what Peter suggested first.

    • jonsys
      Subscriber

      Peter, Sandeep,


      That would resolve the issue,


      Thank you

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