Version 1.5
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Section 8.2: Contact Up Section 8.2: Contact Subsection 8.2.2: Sliding Interfaces

### 8.2.1 Rigid Interfaces

There are two ways to make a deformable object interact with a rigid body, namely via a Rigid interface, or via a Rigid wall.
Rigid interfaces are used to connect a part of the deformable mesh to a non-conforming rigid body. By “non-conforming”, we mean that the nodes comprising the mesh of the deformable object do not mate directly to the nodes comprising the rigid body at the interface. In other words, no nodes are shared between the two objects. The rigid interface requires only one parameter: the rigid material that defines the rigid body.
A rigid wall interface is similar to a sliding interface except that the master surface is a rigid plane. The geometry of the plane is simplified since the master surface is implicitly defined by the plane equation of the wall and does not need to be modeled explicitly. The plane can also be assigned a prescribed displacement in the Curve Editor. Just look for the name of the rigid wall and edit the displacement curve. In this case the plane equation generalizes to:
ax by cz =0
where is the plane offset defined by the loadcurve.
After you select OK the rigid wall will be displayed in the Graphics View. If you don't see it, or if you wish to hide the rigid wall, you can set the appropriate option in the FEBioStudio Options dialog box. This dialog box can be accessed by pressing F6 or from the Tools/Options menu. In the dialog box, select the Physics options from the list on the left side and then check (or uncheck if you wish to hide the walls) the show rigid walls option.
Section 8.2: Contact Up Section 8.2: Contact Subsection 8.2.2: Sliding Interfaces