ABAQUS Volume II: I–Z - Manual (Page 368)

*RIGID BODY
PIN NSET
Set this parameter equal to the name of a node set containing pin-type nodes to be assigned to the
rigid body. This parameter can be used to add nodes to a rigid body or to redefine node types of
nodes on elements included in the rigid body by the ELSET parameter. Pin-type nodes have only
their translational degrees of freedom associated with the rigid body. A node cannot appear in more
than one rigid body definition.
POSITION
Set POSITION=INPUT (default) if the location of the reference node is to be defined by the user.
Set POSITION=CENTER OF MASS if the reference node is to be located at the center of mass
of the rigid body.
TIE NSET
Set this parameter equal to the name of a node set containing tie-type nodes to be assigned to the
rigid body. This parameter can be used to add nodes to a rigid body or to redefine node types of
nodes on elements included in the rigid body by the ELSET parameter. Tie-type nodes have both
their translational and rotational degrees of freedom associated with the rigid body. A node cannot
appear in more than one rigid body definition.
Optional parameters (use only when the element set specified contains rigid elements):
DENSITY
This parameter applies only to ABAQUS/Explicit analyses.
Set this parameter equal to the density of all of the rigid elements in the element set.
NODAL THICKNESS
This parameter applies only to ABAQUS/Explicit analyses.
Include this parameter to indicate that the thickness of the rigid elements should not be read
from the data line but should be interpolated from the thickness specified at the nodes with the
*NODAL THICKNESS option.
OFFSET
This parameter applies only to ABAQUS/Explicit analyses.
Include this parameter to define the distance (as a fraction of the rigid element’s thickness) from
the element’s midsurface to the reference surface containing the element’s nodes. Since no element
level calculations are performed for rigid elements, a specified offset affects only the handling of
contact pairs with rigid surfaces formed by rigid elements.
This parameter accepts positive or negative values or the labels SPOS or SNEG. The positive
values of the offset are in the direction of the element normal. When OFFSET=0.5 (or SPOS),
the top surface of the rigid element is the reference surface. When OFFSET=−0.5 (or SNEG),
the bottom surface of the rigid element is the reference surface. The default is OFFSET=0, which
indicates that the middle surface of the rigid element is the reference surface.
17.18–2
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