Symmetry Expansion in CGX

Expanding Axisymmetric Models

You can expand axisymmetric models with the swep command in CGX 2.10. You have to use 2D-output in CCX.

swep <2Dset> <3Dset> rot <angle> <div>

Set <2Dset> is swept together with the results and then deleted. The new elements are stored in <3Dset>. If you want to keep the 2D elements, then you have to create a copy first and make sure not to sweep the set all.

Expanding Mirror Symmetry

In CGX 2.10 the mirror copy function has been simplified. Now it is sufficient to just specify the normal axis to the mirror plane:

copy <set> <newset> mir x|y|z

This is sufficient for symmetry expansion of most models, as usually the symmetry boundary planes go through the origin.

Command Template

This template assumes that results have been read into CGX and a dataset has been selected for display. It expands a base model in all three directions and plots the expanded parts in grey and the base region in color (according to the dataset values)

seta base all
copy all new mir x
copy all new mir y
copy all new mir z
comp new do
plot f new n
plus fv base

Example 1

Inflation of a square pillow

Example 2

IShrinkage model for weld distortion

Example 3

4-point bending of a sandwich structure

Here, the colored plot in the base model has been limited to the sandwich core.

read core.nam inp
plot f new n
plus fv core