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How to Get Reaction Forces for Mechanical Event Simulation

When performing Mechanical Event Simulation (MES) for combined motion and stress analysis, reaction forces and moments are automatically calculated and applied to nodes to account for the effects of prescribed displacements, prescribed rotations, actuator elements and surface-to-surface contact. You can optionally make reaction forces available for results evaluation, including verifying input loads, validating model behavior, determining load distribution or determining the total force of a pressure load.

To get reaction forces for MES, you can specify options on the "Analysis Parameters" dialog in the FEA Editor environment of FEMPRO as follows:

  • On the "Output" tab, in the "Engineering Calculations and Output" section, set the "Output reaction forces" field to "Calculated" to get the reaction forces at nodes where a prescribed displacement or rotation is applied. If you also want the reaction forces to be listed in an output text file, choose the "Calculated and listed in output file" option (see Figure 1).
  • Figure 1: On the "Output" tab of the "Analysis Parameters" dialog, the "Output reaction forces" option was specified to control the calculation of reaction forces.
  • If the model contains actuator elements, set the "Equivalent actuator induced forces" field to "Calculated" to get the reaction forces induced by actuator elements.
  • To get reaction forces resulting from general surface-to-surface contact, in addition to activating the "Output reaction forces" option as shown in Figure 1, access the "Analysis Parameters - MES: Surface to Surface Contact" dialog and, in the "Nodal reaction forces" field, choose "Output at all contact nodes" to specify that reaction forces from contact will be output (see Figure 2).
Figure 2: On the "Analysis Parameters - MES: Surface to Surface Contact" dialog, the "Nodal reaction forces" option was specified to calculate reaction forces at all contact nodes.

Then, in the Superview IV Results environment, the calculated reaction forces will be available for you to:

  • display result contours of reaction force (see Figure 3);
    Figure 3: Contours of reaction forces are shown for the elements undergoing surface-to-surface contact in this model of spur gears.
  • inquire on results (see How to Inquire on Results at a Specific Location);
  • sum reaction forces (see How to Sum Reaction Forces); and
  • graph reaction forces as curve data during or after processing (see Figure 4).
Figure 4: The Superview IV Results environment's graphing capability was used to plot the reaction moments for a selected node throughout the MES run.

Thus, the capability to get reaction forces for MES provides easy, quick and convenient means to further examine and better understand the model's behavior.

For more information about reaction forces, see the ALGOR User's Guide.



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