Friction in limit displacement boundary condition

Numerical methods and mathematical models of Elmer
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Friction in limit displacement boundary condition

Post by ark » 27 Mar 2019, 16:03


I am modelig the bracket attached to the wall by one screw. It works as cantiliver. When the horizontal arm of the bracket is loaded, the upper part loses contact with the wall, what is taken into account by the 'Displacement Lower Limit' option set on the entire surface adjacent to the wall.

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Boundary Condition 2
  Target Boundaries(1) = 4 
  Name = "wall"
  Displacement 1 Lower Limit = Real 0.0
How to set friction (simply as the displacement = 0 in the direction perpendicular to the direction used in Lower Limit option) in the nodes from the bottom part of the sheet which remain in the contact with the wall?

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Re: Friction in limit displacement boundary condition

Post by raback » 29 Mar 2019, 13:46


There seems to be two ways to account for friction: explicit and implicit. Look at test cases ContactFriction* for examples. The limitation is that frictional force is assumed to be proportional to the normal force.


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