Symmetry Restraint for Solid Models
For solid models, every face that is coincident with a plane of symmetry
should be prevented from moving in its normal direction. The Symmetry
restraint type applies this condition automatically to all selected faces.
The following are some examples of models that are symmetric with respect
to one or more planes.

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This model is symmetrical with respect to one
plane. You can analyze one half of the model. Apply the Symmetry
restraint type to the faces of symmetry. |

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This model is symmetrical with respect to two
planes. You can analyze one quarter of the model. Apply the Symmetry
restraint type to the faces of symmetry. |

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This model is axisymmetric. To analyze the model,
you can use a wedge. Apply the Symmetry
restraint type to the faces of symmetry. Although the angle of the wedge
is arbitrary in theory, using a very small angle may produce bad element
at the tips. |