The
summation of reaction forces in a model is often used to verify input loading,
validate model behavior or determine floor load distributions. In the Results
environment, the "Inquire: Results" dialog can be used to sum the reaction
forces of selected nodes.
Another
typical application of summing reaction forces is to determine the total force
of a pressure load when the area of pressure is unknown and cannot be readily
calculated. As shown in Figure 1, the cutting frame has a pressure load applied
to two surfaces of unknown area and is fully constrained at the bottom of each
of the four legs. The total force of the pressure can be calculated by summing
the vertical reactions of all of the constrained nodes.
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Figure 1: Note the locations
of the pressure loads and constraints in this display of the vertical reaction
forces in the cutting frame.
To
sum the reaction forces in the Results environment for a Static Stress
Analysis:
- Select and
display the desired reaction (X, Y or Z) using the "Results Contours”
tab, “Other Results” panel,
“Reactions” pull-down menu “Reaction Force (Negative) ” pull-out menu;
- Select the nodes
that will be used in the summation;
- Right click
anywhere in the working area;
- In the pop-up
menu that appears, select "Inquire Results"; and
- In the
"Inquire: Results" dialog (Figure 2), click on the
"Summary" pull-down menu and select "Sum".
Figure 2: The "Inquire:
Results" dialog displays information about the selected nodes and the
calculated "Summary" value.
The
summary of the reaction forces of all selected nodes will now be displayed in
the "Inquire: Results" dialog. If desired, the area could be calculated
since the pressure and force values are now known.
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