SEGMENTS Option

analytical_rigid_surface_define_segment
Analytical rigid surface of type SEGMENTS

Select the following options on the Define tab for planar rigid surfaces:

Plane definition

Plane/axis:

Abaqus does not require the plane/axis definition for SEGMENTS type. In HyperMesh, however, the XY plane must be used for a 2D model. Therefore, the XY plane is selected by default. If the model is not in the XY plane, you can choose to select a "User Defined" plane on which the rigid surface should be defined.

If you choose to manually define the plane/axis, you must enter values for three points (the origin, x axis, and y axis) that define the local coordinate system.

You can also use the following buttons to automatically define the plane in the Local System table:

Pick System...	Click to select an existing system from the model. Once you select a plane from the model and click proceed, the values are populated in the table.
Create/Edit System...	Click to create new coordinate systems using the Systems panel.

Line definition

No. of line segment datalines

In this field you specify the number of datalines needed to define the line segments. The actual number of line segments is one less than this number.

Start by typing the number of datalines needed to define the line segments and click Set. The corresponding number of rows appears in the Line Type table below. In this table, specify the coordinates of the ends of each line segment.

The first entry in the table is always the START node. This value specifies the beginning point of the first segment. The subsequent segments’ starting point is always the end point of the previous segment, or the START node if the segment is the first in the definition.

For each line type, select a type from the Line Type column: LINE, CIRCL, or PARAB. Each selection activates the appropriate number of columns for the segment definition.

The segments can be circles, parabolas, or lines. Enter data in the columns as described below:

•	Lines are defined with the x and y coordinates of the end point in the two active columns.

•	For circles, specify the x and y coordinate of the end point in the first two columns and then, define the x and y coordinate of the center in the last two columns.

•	For parabolas, specify the x and y coordinate of the mid point in the first two columns and then, define the x and y coordinate of the end point in the last two columns. You can also pick nodes or lines from existing geometry using the following buttons:

Pick Nodes…

Click to pick nodes from the HyperMesh model for selected line segments. When you click proceed, the coordinate values of the selected nodes will appear in selected line segment cells. In addition, temporary line segments (white color) will also be drawn in the graphic area from the picked nodes. Ensure that you select two nodes in the correct order for circles and parabolas.

Pick Lines…

Use this option to define line segments from existing lines in HyperMesh. These lines must be single curvature, connected and node1 of a line must be same as node2 of the previous line.

Click to pick a line from the HyperMesh model. When you click proceed, the coordinate values and line types for the selected lines will appear in the table.

Note:

In HyperMesh, the sequence of node1 and node2 for lines can be visualized from the Line Edit/Extend Line panel.

Click Update to update the HyperMesh database with your settings.