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ANSYS Contact Problem

  1. Jan 20, 2014 #1
    I'm currently writing my thesis on a "Finite Element Analysis of rail fastening systems under dynamic load", and I'm using ANSYS Workbench 14.0 for that matter.

    I don't know how to define the contact area for the clip and the angle guide plate, since it will be changing over time as the clip (and the plate) deform due to the loads applied.
    http://imgur.com/xbLPbOl
    http://imgur.com/eVhZB6G

    This picture shows the existing gap between them, for you to see the future contact areas:
    http://imgur.com/YdmPnxy

    The CAD data for both objects were obtained with a 3D scanner, which means that the surfaces are neither smooth nor perfectly fitting to each other.

    I'm too experienced with ANSYS; therefore a thorough answer will be greatly appreciated!

    Thank you in advance!
     
  2. jcsd
  3. Jan 20, 2014 #2

    Mech_Engineer

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    Science Advisor
    Gold Member

    There is a lot to consider, you'll have to get into the gritty details of the contact conditions if you hope to defend the thesis. From a high level, the main considerations you should address from what I'm seeing:

    • You should clean up your mesh by inserting a "Method" object in the mesh portion of the problem tree, and select "hex dominant." This will give you a quad-primary mesh. You're also going to want a much denser mesh than what you have right now.
    • I would select frictionless contact conditions for a start, and then add friction as you have a reliably converging problem setup. Make sure you select your coefficient of friction carefully though, it can vary wildly with subtle changes in material and surface finish.
    • Select "augmented lagrange" for your contact condition formulation, make sure the contacts update every substep, and have "automatic bisection" active.
    • Make sure you have similarly sized elements on both sides of the contact condition using a "contact sizing" mesh element.
    • Substeps: you'll want a lot of them. Possibly hundreds.

    That should give you a good start anyway.
     
  4. Jan 21, 2014 #3
    Hello Mech_Engineer,

    Yes, it's kind of a hard project considering I'm pretty new to ANSYS.

    Thanks for the advice, I really appreciate it!
     
  5. Feb 27, 2014 #4
    Ansys 14.5 contact setting help

    Hello to all ,
    I new to ansys workbench and im need guidance as to how to do contact settings and how to find the friction between two moving surfaces. Im designing a surgical scissor. Kindly let me know what settings are preferable for contact setting of scissor and how to find friction between surfaces.

    thanks for taking time and helping me.
     
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