You can create a rotational body force load to define loads resulting from rotation of the model. You can specify either angular velocity or rotary acceleration; ABAQUS defines the load by using the square of the angular velocity or by using the acceleration directly. In either case the load definition must include an axis of rotation, which is defined as follows:
If you are working in three-dimensional space, you define the location and direction of the axis by entering the global coordinates of two points.
If you are working in two-dimensional space, you specify the location of the axis by entering the coordinates of a point in the plane. The direction of the axis is always out of the plane.
If you are working in axisymmetric space, the axis is always in the location and direction of the positive global Z-axis.
Note: You can define a rotary acceleration force only in two- or three-dimensional space.
To create or edit a rotational body force:
Display the rotational body force load editor using one of the following methods:
To create a new rotational body force load, follow the procedure outlined in “Creating loads,” Section 16.8.1 (Category: Mechanical; Types for Selected Step: Rotational body force).
If you are working in two- or three-dimensional space, enter in the prompt area the required information concerning the location and, if applicable, direction of the axis of rotation.
To edit an existing rotational body force load using menus or managers, see “Editing step-dependent objects,” Section 3.4.12. To edit the region to which the load is applied, see “Editing the region to which a prescribed condition is applied,” Section 16.8.4.
If you are editing a load in the step in which it was created, an Edit button appears next to each point you specified in the load editor. Click Edit if you want to change the coordinates that determine the location and, if applicable, direction of the axis of rotation. (This option applies only if you are working in two- or three-dimensional space.)
Select the force type of your choice:
Toggle Centrifugal if you want to define a centrifugal force.
Toggle Rotary acceleration if you want to define a rotary acceleration force.
In the Magnitude field, enter the appropriate value:
If you are defining a centrifugal force, enter the angular velocity in radians/time.
If you are defining a rotary acceleration force, enter the rotary acceleration in radians/time2.
If desired, click the arrow to the right of the Amplitude field, and select the amplitude of your choice from the list that appears. Alternatively, you can click Create to create a new amplitude. (See Chapter 38, “The Amplitude toolset,” for more information.)
Click OK to save your data and to exit the editor.
