Contact pair
Contact pair
*Contact pair, Interaction=<interaction name>, Discretisation=<Discretisation type> [,Adjust] [,Perturbation] [,General]
<Slave Surface>, <Master Surface>
This option defines a contact pair. The sub-keywords Interaction and
Discretisation are mandatory. The interaction (*Interaction) as well as the surfaces (*Surface) have to be
defined beforehand. The following discretisation methods are available:
| Type | Description | Analysis type |
|---|---|---|
element mortar |
element-based mortar discretisation | 2D/3D/axisym. |
segment mortar |
segment-based mortar discretisation | 2D/axisym. |
NTN |
node-to-node discretisation | 2D/3D/axisym. |
Generally, the slave and the master surface should have a comparable
number of nodes. If the modelling requires to mesh one of them finer
than the other, choose the finer surface as slave. This is in particular
important if the segment mortar method is used.
In case General is used, all surfaces defined in the model are merged
and paired with itself. No subsequent line is allowed in this case. Note
that this method also allows for self-contact. The surfaces in the model
have to be defined prior. An automatic detection of material surfaces is
not yet implemented.
Note that contact in 3D models is currently limited to the
element mortar and NTN surface discretisation methods. In addition,
fluid contact and fluid interaction as described in *Interaction are only available for the
element mortar technique.
The sub-keyword Adjust can be added to resolve initial over-closures.
Any normal stresses due to initial penetrations are not considered.
Perturbation can be used to calculate the stiffness contribution of the contact by means of numerical differentiation.