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Add User-Defined Sphere/Ellipsoid Surface

The Add User-Defined Sphere/Ellipse Surfaces option allows you to define individual spherical or ellipsoidal slip surfaces with user-defined parameters (e.g. center, radius).

This option is only enabled if the Surface Generation Method in the Slip Surface Options dialog is set to User Defined Surfaces.

To add a user-defined sphere/ellipse slip surface:

  1. Select the Slip Surfaces slip surfaces workflow tab workflow tab.
  2. Make sure the Surface Generation Method = User Defined Surfaces in the Slip Surface Options dialog.
  3. Select Add User Defined Sphere/Ellipse Surface add ellipse icon from the toolbar or the Surfaces menu. You will see the Add User Defined Surfaces dialog.
  4. Select the Surface Type - Sphere or Ellipsoidal.
    • For a sphere, you can enter Center (x,y,z) and Radius.
    • For an ellipsoid you can enter Center (x,y,z), Radius (x,y,z) and Rotation (x,y,z).
  5. Select OK and the sphere or ellipsoid will be added to the model.

You can add any number of user-defined slip surfaces. To add additional surfaces repeat steps 3 to 5.

If you are analyzing User Defined Slip Surfaces, then you CANNOT use a primary Search Method (e.g. Grid Search, Cuckoo Search, Particle Swarm) to search for critical slip surfaces, and vice versa. The two options are exclusive. If you need to analyze user-defined slip surfaces and search for critical surfaces, then you will have to carry out the analyses separately.
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