This section describes how to create a geometric restriction in a bead optimization. The following topics are covered:
You can specify a fixed region restriction for a bead optimization. A fixed region is restrained in selected degrees of freedom (1-, 2-, or 3-direction. The degrees of freedom are defined relative to a selected coordinate system.
To create a fixed region restriction:
From the main menu bar, select Geometric Restriction
Create.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the 
tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Fixed Region (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the faces to which the fixation will be applied. For more information, see “Using the face curvature method to select multiple faces,” Section 6.2.4.
If you would rather select from a list of existing face sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting faces, click Done in the prompt area.
The Edit Geometric Restriction dialog box appears.
Select the coordinate system that defines the degrees of freedom. You can select the global coordinate system, or you can create a datum coordinate system (see “An overview of the methods for creating a datum coordinate system,” Section 62.5.4, for more information).
Toggle on the degrees of freedom that you want to restrain.
Click OK to create the fixed region geometric restriction and to exit the editor.
You can specify a growth restriction for a bead optimization. A growth restriction limits how much a face can grow (shell nodes at the location of the beads are moving out) relative to the initial design during the creation of the bead.
For a general bead optimization, you must limit the bead height by creating a growth geometric restriction that limits the displacement in the growth direction. The growth geometric restriction is required because it is the only restriction on the displacement of the nodes.
To create a growth restriction:
From the main menu bar, select Geometric RestrictionCreate.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Growth (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the faces to which the growth restrictions will be applied. For more information, see “Using the face curvature method to select multiple faces,” Section 6.2.4.
If you would rather select from a list of existing face sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting faces, click Done in the prompt area.
The Edit Geometric Restriction dialog box appears.
Toggle on Maximum in shrink direction, and enter a positive value specifying the maximum inward displacement of a node. You can specify the maximum inward displacement of a node only for a general bead optimization.
Toggle on Maximum in growth direction, and enter a positive value specifying the maximum outward displacement of a node relative to the initial location.
Click OK to create the growth geometric restriction and to exit the editor.
A penetration check geometric restriction in a bead optimization results in an optimized model with faces that cannot penetrate selected regions.
To create a surface penetration check restriction:
From the main menu bar, select Geometric RestrictionCreate.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Penetration check (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the faces to which the penetration check will be applied. For more information, see “Using the face curvature method to select multiple faces,” Section 6.2.4.
If you would rather select from a list of existing face sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting faces, click Done in the prompt area.
The Edit Geometric Restriction dialog box appears.
Select the regions that cannot be penetrated by faces of the optimized model.
Click OK to create the penetration check geometric restriction and to exit the editor.
You can specify a planar symmetry geometric restriction for a condition-based bead optimization. A planar symmetry geometric restriction forces the optimized model to be symmetric about a specified plane. You specify the plane of symmetry by selecting the axis of a coordinate system that is the normal to the plane of symmetry. You can use the global coordinate system, or you can create a datum coordinate system (see “An overview of the methods for creating a datum coordinate system,” Section 62.5.4, for more information). You can choose to remove frozen regions from the symmetry restriction.
To create a planar symmetry restriction:
From the main menu bar, select Geometric RestrictionCreate.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Planar symmetry (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the region in which the planar symmetry will be enforced or click Done to apply the planar symmetry restriction to the entire model.
By default, Abaqus/CAE allows you to select all of the model. To select faces or cells, use the Selection toolbar to change the type of object that you can select to Face or Cells. For more information, see “Filtering your selection based on the type of object,” Section 6.3.2.
If you would rather select from a list of existing sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting the geometric restriction region, click Done in the prompt area. For more information on selecting objects, see Chapter 6, “Selecting objects within the viewport.”
The Edit Geometric Restriction dialog box appears.
Select the coordinate system, and select the axis of the coordinate system that represents the normal to the plane of symmetry.
Click OK to create the planar symmetry geometric restriction and to exit the editor.
You can specify a point symmetry geometric restriction for a condition-based bead optimization. A point symmetry geometric restriction forces the optimized model to be symmetric about a specified point. You specify the point of symmetry by selecting a coordinate system (the point of symmetry is assumed to be the origin of the coordinate system). You can use the global coordinate system, or you can create a datum coordinate system (see “An overview of the methods for creating a datum coordinate system,” Section 62.5.4, for more information).
To create a point symmetry restriction:
From the main menu bar, select Geometric RestrictionCreate.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Point symmetry (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the region in which the point symmetry will be enforced or click Done to apply the point symmetry restriction to the entire model.
By default, Abaqus/CAE allows you to select all of the model. To select faces or cells, use the Selection toolbar to change the type of object that you can select to Face or Cells. For more information, see “Filtering your selection based on the type of object,” Section 6.3.2.
If you would rather select from a list of existing sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting the geometric restriction region, click Done in the prompt area. For more information on selecting objects, see Chapter 6, “Selecting objects within the viewport.”
The Edit Geometric Restriction dialog box appears.
Select the coordinate system. The point of symmetry is assumed to be the origin of the selected coordinate system.
Click OK to create the point symmetry geometric restriction and to exit the editor.
You can specify a rotational symmetry geometric restriction for a condition-based bead optimization. A rotational symmetry geometric restriction forces the optimized model to be symmetric about a specified axis of a coordinate system. You can use the global coordinate system, or you can create a datum coordinate system (see “An overview of the methods for creating a datum coordinate system,” Section 62.5.4, for more information).
To create a rotational symmetry restriction:
From the main menu bar, select Geometric RestrictionCreate.
The Create Geometric Restriction dialog box appears.
Tip: You can initiate the Create procedure in two other ways:
Click Create in the Geometric Restriction Manager. (You can display the Geometric Restriction Manager by selecting Geometric RestrictionManager from the main menu bar.)
Click the tool in the Optimization module toolbox.
From the Create Geometric Restriction dialog box that appears, enter the name of the geometric restriction.
Select Rotational symmetry (Bead) from the list of geometric restrictions, and click Continue.
From the viewport, select the region in which the rotational symmetry will be enforced or click Done to apply the rotational symmetry restriction to the entire model.
By default, Abaqus/CAE allows you to select all of the model. To select faces or cells, use the Selection toolbar to change the type of object that you can select to Face or Cells. For more information, see “Filtering your selection based on the type of object,” Section 6.3.2.
If you would rather select from a list of existing sets, do the following:
Click Sets on the right side of the prompt area.
Abaqus/CAE displays the Region Selection dialog box containing a list of available sets.
Select the set of interest, and click Continue.
Note: The default selection method is based on the selection method you most recently employed. To revert to the other method, click Select in Viewport or Sets on the right side of the prompt area.
When you have finished selecting the geometric restriction region, click Done in the prompt area. For more information on selecting objects, see Chapter 6, “Selecting objects within the viewport.”
The Edit Geometric Restriction dialog box appears.
Select the coordinate system, and select the axis of the coordinate system that represents the axis of symmetry.
Enter the Repeating segment size, which is the angle (in degrees) specifying the size of the repeating segment. The value must be greater than or equal to 2°.
Click OK to create the rotational symmetry geometric restriction and to exit the editor.