Circular Arc
A circular arc is a curve object in 2D having a single circular edge. To create a circular arc, you can:
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Right-click the 2D Geometry node and add a Circular Arc node () to the sequence, then define it in the Settings window, or
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On the 2D Sketch toolbar Draw group, from the Circular Arc () menu, select Start, Center, Angle (); Start, Tangent, End (); or Start, Middle, End (). Then draw the circle in the Graphics window by defining points according to the selected properties for a circular arc. Also see Drawing Geometric Primitives in the Graphics Window.
If desired, enter the properties of the circular arc using the following sections:
Properties
For flexibility, the Settings window contains more properties than needed, and these properties are automatically kept consistent when you change a property. The Specify list determines a set of independent properties that are sufficient to specify:
Table 7-4: Principal Properties to Specify for a Circular Arc
Value
Principal Properties
Center, radius, angles
Center, Radius, Start angle, End angle, Clockwise
Endpoints and radius
Starting Point, Endpoint, Radius, Clockwise, Short arc
Endpoints and start angle
Starting Point, Endpoint, Start angle, Clockwise
Endpoints and end angle
Starting Point, Endpoint, End angle, Clockwise
Center
Enter the center coordinates for the circular arc in the x and y fields (SI unit: m).
Starting Point
Enter the starting point for the circular arc in the x and y fields (SI unit: m).
Endpoint
Enter the endpoint for the circular arc in the x and y fields (SI unit: m).
Radius
Enter the radius of the circular arc in the x and y fields (SI unit: m).
Angles
Enter the start and end angles for the circular arc in the Start angle and End angle fields, respectively (unit: deg).
By default, the angles are counted clockwise. Clear the Clockwise check box to make the angles count in a counterclockwise direction.
The Short arc check box is enabled when Principal properties is set to Endpoints and radius. When selected, the arc will span at most 180 degrees.
Selections of Resulting Entities
This section is not available if the Circular Arc node is a subnode under a Composite Curve node.
Select the Resulting objects selection check box to create predefined selections (for all levels — objects, domains, boundaries, edges, and points — that are applicable) in subsequent nodes in the geometry sequence. To also make all or one of the types of resulting entities (domains, boundaries, edges, and points) that the cone consists of available as selections in all applicable selection lists (in physics and materials settings, for example), choose an option from the Show in physics (Show in instances if in a geometry part) list: All levels, Domain selection, Boundary selection, Edge selection, or Point selection. The default is Domain selection, which is suitable for use with materials and physics defined in domains. For use with a boundary condition, for example, choose Boundary selection. These selections do not appear as separate selection nodes in the model tree. Select Off to not make any selection available outside of the geometry sequence. From the Color list, choose a color for highlighting the resulting objects selection. See Selection Colors.
Cumulative Selection
If you want to make the resulting entities contribute to a cumulative selection, select a cumulative selection from the Contribute to list (the default, None, gives no contribution), or click the New button to create a new cumulative selection (see Cumulative Selections).