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 Subsubsection 3.12.3.5: Surface Attraction Up Chapter 3: Free Format Input Subsection 3.13.1: Sliding Interfaces 

3.13 Contact Section

The Contact section defines all the contact interfaces. Contact boundary conditions are defined with the contact sub-element. The type attribute specifies the type of contact interface that is defined. The surface_pair attribute defines the surface pair to use for this contact definition. The surface pair is defined the the Mesh section. For example:
<contact type="sliding-elastic" surface_pair="contact1">
  <!-- parameter go here -->
</contact>
The type can be one of the following options:
Type Description
sliding-node-on-facet, sliding-facet-on-facet, sliding-elastic, sliding-biphasic, sliding-biphasic-solute, sliding-multiphasic A sliding interface that may separate (with biphasic contact for sliding-biphasic, biphasic-solute contact for sliding-biphasic-solute, and multiphasic contact for sliding-multiphasic)
rigid_wall A sliding interface with rigid wall as secondary surface
rigid_joint A joint between two rigid bodies
tied,sticky, tied-biphasic A tied interface (solid-solid, solid-rigid, solid-biphasic, rigid-biphasic) or tied-biphasic interface (biphasic-biphasic).
 Subsubsection 3.12.3.5: Surface Attraction Up Chapter 3: Free Format Input Subsection 3.13.1: Sliding Interfaces 

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