Contact

First define the interaction type:

*Interaction, Name=<name>, Mechanical=<>, [no separation], [user], [stiffness_factor=<>], [non constant]
<Normal contact model properties>
*Friction, model=<friction model name>, [stiffness_factor=<>]
<Properties of the friction model>

Use the defined interaction in a contact pair:

*Contact pair, Interaction=<interaction name>, Discretisation=<Discretisation type> [,Adjust] [,Perturbation] [,General]
<Slave Surface>, <Master Surface>

Optionally define special contact options:

*Contact options, Name=<interaction name>, [clearance=<normal contact distance>], [ Check Disp = <Fraction of contact length>], [ Check Dist = <Fraction of contact length>]

The sub-keywords following are given in the following Sections.