*CYCLIC SYMMETRY MODEL
Keywords: ccx

Next: *DEFORMATION PLASTICITY Up: Input deck format Previous: *CYCLIC HARDENING Contents

##
*CYCLIC SYMMETRY MODEL

Keyword type: model definition

This keyword is used to define the number of sectors and the axis of symmetry in a cylic symmetric structure for use in a cyclic symmetry calculation. It must be preceded by two *SURFACE cards defining the nodes belonging to the left and right boundary of the sector, respectively, and a *TIE card linking those surfaces, in that order. The axis of symmetry is defined by two points a and b, defined in global Carthesian coordinates.

There are four parameters, N, NGRAPH, TIE and ELSET. The parameter N, specifying the number of sectors, is required.

The parameter NGRAPH is optional and indicates for how many sectors the solutions should be stored in .frd format. Setting NGRAPH=N for N sectors stores the solution for the complete structure for subsequent plotting purposes. Default is NGRAPH=1.

The parameter TIE specifies the name of the tie constraint to which the cyclic symmetry model definition applies. It need not be specified if only one *TIE card has been defined.

The element set specified by ELSET specifies the elements to which the parameter NGRAPH should be applied. Default if only one *TIE card was used is the complete model.

Several *CYCLIC SYMMETRY MODEL cards within one input deck defining several cyclic symmetries within one and the same model are allowed. This, however, always is an approximation, since several cyclic symmetries within one model cannot really exist. Good results are only feasible if the values of N for the different *CYCLIC SYMMETRY MODEL cards do not deviate substantially.

First line:

- *CYCLIC SYMMETRY MODEL
- Enter the required parameter N, and its value.

Second line:

- X-coordinate of point a.
- Y-coordinate of point a.
- Z-coordinate of point a.
- X-coordinate of point b.
- Y-coordinate of point b.
- Z-coordinate of point b.

    Example:

    *CYCLIC SYMMETRY MODEL, N=12, NGRAPH=3
    0.,0.,0.,1.,0.,0.

defines a cylic symmetric structure consisting of 30° sectors and axis of symmetry through the points (0.,0.,0.) and (1.,0.,0.). The solution will be stored for three connected sectors (120°).

Example files: segment, fullseg.

Next: *DEFORMATION PLASTICITY Up: Input deck format Previous: *CYCLIC HARDENING Contents