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Subsubsection 3.18.1.1: Node_Data Class Up Subsection 3.18.1: Logfile Subsubsection 3.18.1.3: Element_Data Class

#### 3.18.1.2 Face_Data Class

The face_data class defines a set of surface variables. This item requires the surface attribute, which defines the surface that will be used to extract the data from. The surface must be defined in the Mesh section. The data is stored for each surface facet that is listed in the item list, or for all facets of the surface if no list is defined.
The following surface variables are defined. Note that the actual value is the average over the facet's integration points values (if applicable).
 Element variables Description contact gap The gap (separation) of the contact interface this surface belongs to. contact pressure The normal contact pressure of the contact interface this surface belongs to.
Example:
This example stores the contact gap and contact pressure of all the facets of surface “FacetOnFacetSliding1_primary”. The surface is defined in the Mesh section.
<logfile>
<face_data data="contact gap;contact pressure" surface="FacetOnFacetSliding1_primary"/>
</logfile>

Subsubsection 3.18.1.1: Node_Data Class Up Subsection 3.18.1: Logfile Subsubsection 3.18.1.3: Element_Data Class