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*TRANSFORM

Keyword type: model definition

This option may be used to specify a local axis system X'-Y'-Z' to be used for defining SPC's, MPC's and nodal forces. For now, rectangular and cylindrical systems can be defined, triggered by the parameter TYPE=R (default) and TYPE=C.

A rectangular system is defined by specifying a point a on the local X' axis and a point b belonging to the X'-Y' plane but not on the X' axis. A right hand system is assumed (Figure 33).

Figure 33: Definition of a rectangular coordinate system

When using a cylindrical system two points a and b on the axis must be given. The X' axis is in radial direction, the Z' axis in axial direction from point a to point b, and Y' is in tangential direction such that X'-Y'-Z' is a right hand system (Figure 34).

Figure 34: Definition of a cylindrical coordinate system

The parameter NSET, specifying the node set for which the transformation applies, is required.

It is important to note that SPC's and MPC's defined BEFORE a *TRANSFORM card are NOT affected by it. Thus all SPC's and MPC's defined before the first occurence of a *TRANSFORM card are defined in the global Carthesian system. The effect of a *TRANSFORM card extends up to the occurrence of another *TRANSFORM card, at least for the nodes in common.

First line:

- *TRANSFORM
- Enter the required parameter NSET, and the optional parameter TYPE if needed.

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:

    *TRANSFORM,NSET=No1,TYPE=R
    0.,1.,0.,0.,0.,1.

assigns a new rectangular coordinate system to the nodes belonging to (node) set No1. The x- and the y-axes in the local system are the y- and z-axes in the global system.

Example files: segment1, segment2, segmentf, segmentm.

Next: *USER MATERIAL Up: Input deck format Previous: *TIE Contents