ABAQUS Volume II: I–Z - Manual (Page 520)

*SURFACE INTERACTION
Set this parameter equal to the thickness of an interfacial layer between the contacting surfaces.
The value can be positive or negative.
USER
Include this parameter if the surface interaction model is to be defined in user subroutine UINTER in
an ABAQUS/Standard analysis or in user subroutine VUINTER in an ABAQUS/Explicit analysis.
When this parameter is included, the *SURFACE BEHAVIOR option and its various suboptions
cannot be used under the same interaction definition.
Optional parameters if the USER parameter is used:
DEPVAR
Set DEPVAR equal to the number of state-dependent variables required for user subroutine UINTER
in an ABAQUS/Standard analysis or for user subroutine VUINTER in an ABAQUS/Explicit
analysis. The default is DEPVAR=0.
PROPERTIES
Set this parameter equal to the number of property values needed as data to define the surface
interaction model in user subroutine UINTER in an ABAQUS/Standard analysis or in user
subroutine VUINTER in an ABAQUS/Explicit analysis. The default is PROPERTIES=0. This
parameter is ignored when the option is used in association with a connector element.
UNSYMM
This parameter applies only to ABAQUS/Standard analyses.
Include this parameter when the interface stiffness matrix is not symmetric. This parameter
causes ABAQUS/Standard to use its unsymmetric equation solution procedures.
Optional data line for two-dimensional models in ABAQUS/Standard or for contact pairs
involving node-based surfaces in ABAQUS/Standard, if the USER parameter is omitted:
First (and only) line:
1. Out-of-plane thickness of the surface or cross-sectional area for every node in the node-based
surface. The default value is 1.0.
Data lines to define the surface interaction in an ABAQUS/Standard analysis if the USER
parameter is used:
First line:
1. Out-of-plane thickness of the surface for two-dimensional models or cross-sectional area for
every node in the node-based surface. The default value for both is 1.0. In other situations,
enter a blank line.
18.49–2
ABAQUS Version 6.1 Module: ID:
Printed on: