Products
Abaqus/Standard
Abaqus/Explicit
Abaqus/CAE
Type
Model data
LevelPartPart instanceAssembly
Abaqus/CAE
Interaction module
Optional parameters
-
COUPLING
-
This parameter controls whether the rotation of the cloud nodes participates in
translational coupling constraints for the reference node.
Set
COUPLING=CONTINUUM
(default) to couple the displacement and rotation of the reference node to the
displacement (but not rotation) of the cloud nodes within the influence radius.
Set
COUPLING=STRUCTURAL
to couple the displacement and rotation of the reference node to the displacement and
rotation of the cloud nodes within the influence radius. This parameter value is
available only in three-dimensional analyses.
-
FREE NODES
-
This parameter applies only to Abaqus/Standard analyses.
Set this parameter equal to the treatment method for nodes that are not part of any
user-defined element but are part of cloud nodes. The default if this parameter is
omitted is
FREE NODES=ALLOW.
Set
FREE NODES=ALLOW
to allow the unattached nodes.
Set
FREE NODES=ERROR
to treat unattached nodes as a user error.
Set
FREE NODES=REMOVE
to remove the unattached nodes.
-
ROTATIONAL COUPLING
-
This parameter applies only to Abaqus/Standard analyses.
This parameter controls whether the rotation of the cloud nodes participates in
rotational coupling constraints for the reference node.
Set
ROTATIONAL COUPLING=CONTINUUM
to couple the rotation of the reference node to the displacement (but not rotation) of
the cloud nodes within the influence radius.
Set
ROTATIONAL COUPLING=STRUCTURAL
(default) to couple the rotation of the reference node to the displacement and
rotation of the cloud nodes within the influence radius.
-
SINGLE FACET
-
This parameter applies only to Abaqus/Explicit analyses.
This parameter controls whether a distributing coupling that is attached only to a
single facet of an element should be converted to a tie constraint.
Set
SINGLE FACET=TIE CONVERT
(default) to convert a distributing coupling that is attached to only one facet of the
element to a tie constraint.
Set
SINGLE FACET=DISTRIBUTING
to retain the distributing coupling constraint.
-
WEIGHTING METHOD
-
Set this parameter equal to the weighting method to modify the default weight
distribution at the coupling nodes. The default if this parameter is omitted is
WEIGHTING METHOD=UNIFORM.
Set
WEIGHTING METHOD=UNIFORM
to select a uniform weight distribution equal to 1.0.
Set
WEIGHTING METHOD=LINEAR
to select a linear decreasing weight distribution with distance from the reference
node.
Set
WEIGHTING METHOD=QUADRATIC
to select a quadratic polynomial decreasing weight distribution with distance from the
reference node.
Set
WEIGHTING METHOD=CUBIC
to select a cubic polynomial monotonic decreasing weight distribution with distance
from the reference node.
Data lines to specify the degrees of freedom to be constrained
- First line
-
First degree of freedom constrained. See Conventions for a
definition of the numbering of degrees of freedom in Abaqus. If this field is left blank, all degrees of freedom will be constrained.
Last degree of freedom constrained. If this field is left blank, the
degree of freedom specified in the first field will be the only one constrained.
- Only rotational degrees of freedom can be released. All available
translational degrees of freedom are constrained. If the user specifies one or more
rotation degrees of freedom but not all available translational degrees of freedom,
Abaqus will issue a warning message and add all available translational degrees of
freedom to the constraint.
Repeat this data line as often as necessary to specify constraints for
different degrees of freedom. When the
ORIENTATION parameter is specified on the
associated COUPLING option, the degrees of
freedom are in the referenced local system in the initial configuration; otherwise, they are
in the global system. In either case these directions will rotate with the reference node in
large-displacement analyses (when the
NLGEOM parameter is included on the STEP option).