Defining an inertia relief load

You can create an inertia relief load to balance externally applied forces on a free or partially free body. An inertia relief load is applied to the whole model. You can apply only one active inertia relief load for each general analysis step. For detailed information about inertia relief loads, see Inertia relief.

Note:

You cannot apply inertia relief loads in submodels. For submodels Abaqus ignores the inertia relief effect computed by including an inertia relief load in the global model.

Related Topics
Creating and modifying prescribed conditions
Understanding symbols that represent prescribed conditions
In Other Guides
Inertia relief

  1. Display the inertia relief load editor using one of the following methods:

    • To create a new inertia relief load, follow the procedure outlined in Creating loads (Category: Mechanical; Types for Selected Step: Inertia relief).

    • To edit an existing inertia relief load using menus or managers, see Editing step-dependent objects.

  2. If a Method field appears toward the top of the editor, click the arrow to the right of the field, and select one of the following:

    • Select Compute loading to continue to compute loading for the specified directions.

    • Select Fix at current loading to fix the loading at the magnitude and direction from the previous step.

    The Method option is unavailable in the step in which the inertia relief load is created.

  3. Toggle on a degree of freedom to define a free direction along which you want to apply the inertia relief load. The degrees of freedom displayed are dependent on the modeling space.

  4. If you want to change the coordinate system (CSYS) for the inertial relief load, click and use one of the following methods:

    • Select an existing datum coordinate system in the viewport.

    • Select an existing datum coordinate system by name.

      1. From the prompt area, click Datum CSYS List to display a list of datum coordinate systems.

      2. Select a name from the list, and click OK.

    • Click Use Global CSYS from the prompt area to revert to the global coordinate system.

    This coordinate system editing option is available only in the step in which the inertia relief load is created. By default, the global coordinate system is used to define the load.

  5. If X, Y, and Z text fields appear at the bottom of the editor, enter the coordinates of the additional point that is required to define the rigid body motion. You must define an additional point for certain combinations of free directions. For more information, see Inertia relief.

  6. Click OK to save your data and to exit the editor.