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*TIE

Keyword type: model definition

This option is used to tie the two surfaces bounding the datum sector in a cyclic symmetry calculation. It can only be used with 3-dimensional elements (no plane stress, plane strain, axisymmetric, beam or shell elements).Optional parameters are POSITION TOLERANCE and NAME, CYCLIC SYMMETRY is a required parameter. The dependent surface is called the slave surface, the independent surface is the master surface. The user can freely decide which surface he takes as slave and which as master. The surfaces are defined using the *SURFACE as sets of nodes. Nodes belonging to the dependent surface cannot be used as dependent nodes in other SPC's or MPC's. Only nodes on the axis of cyclic symmetry can belong both to the slave as well as to the master surface. For each slave node, a master node is determined which matches the slave node within a tolerance specified by the parameter POSITION TOLERANCE after rotation about the cyclic symmetry axis . If this parameter is not used, the closest master node after rotation is taken. Thus, it is important that master and slave node match as well as possible.

The parameter NAME is needed if more than one *TIE constraint is defined. It allows the user to distinguish the tie constraints when referring to them in other keyword cards (e.g. *CYCLIC SYMMETRY MODEL.

First line:

- *TIE
- enter the required parameter CYCLIC SYMMETRY and any of the optional parameters, if needed.

Following line:

- Name of the slave surface.
- Name of the master surface.

    Example:

    *TIE,POSITION TOLERANCE=0.01
    left,right

defines a datum sector with slave surface left and master surface right, and defines a position tolerance of 0.01 length units.

Example files: segment, fullseg.

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