Abaqus Analysis User's Manual
2.1.6 Adjusting nodal coordinates
Products: Abaqus/Standard Abaqus/Explicit Abaqus/CAE
References
*ADJUST
“Defining adjust points constraints,” Section 15.15.5 of the Abaqus/CAE User's Manual
Overview
Nodal adjustment is used for:
adjusting user-specified nodal coordinates so that the nodes lie on a given surface; and
specifying the direction along which the nodes are moved.
Adjusting nodal coordinates
In general, user-specified nodal coordinates are not modified during input file processing. However, there are some situations where mesh coordinates are known only in a generic way and it is inconvenient to determine their coordinates for their actual usage. For example, when using fasteners the specified reference node should be positioned at its projection point on the associated surface. Since that location may be known only approximately, you can use nodal adjustment to move the reference node to that location automatically. For typical usage of the nodal adjustment feature, refer to “About assembled fasteners,” Section 29.1.3 of the Abaqus/CAE User's Manual.
When using this feature, the nodes are adjusted to lie on the specified surface without regard for shell thickness or shell offsets. Therefore,
it is not advisable to use this feature as a way of correcting initial overclosures for contact or for tie constraints. In addition, care should be taken when choosing the nodes to be adjusted because the feature does not respect any constraints relating the relative position of the adjusted node with other nodes (e.g., rigid body definitions).
Input File Usage: Use the following option to identify the
nodes to be moved and the surface onto which the nodes are to be moved:
*ADJUST, NODE SET=name, SURFACE=name
Abaqus/CAE Usage: Use the following option to move the control point
of a coupling constraint onto the coupling surface: Interaction module: ConstraintCreate: Coupling; Adjust control point to lie on surface
Use the following option to move any point or points onto any surface:
Interaction module: Constraintpoints
Specifying the nodal adjustment direction
A node can be moved to the surface using a normal adjustment or a directed adjustment. By default, the node is adjusted to the closest point on the specified surface along the normal to the surface. You can specify an orientation to move the node to the surface along a given direction rather than along the normal to the surface. The vector along the local
Z-direction from the orientation definition is used to move the node to the surface (see “Orientations,” Section 2.2.5). If no projection can be found, the nodal coordinates are left unmodified.
Input File Usage: *ADJUST, ORIENTATION=name
Abaqus/CAE Usage: The orientation projection option is not supported
in Abaqus/CAE.
Create: Adjust
