Grid point force and moment results

	This video demonstrates how to use the Nodal Combination — Sum post view option to display grid point forces for a group of elements.

Grid point forces and moments are the internal forces and moments that elements exert at nodes. Because multiple elements typically share a node, multiple grid point forces and moments act at a given node. Thus, grid point forces and moments are element-nodal results.

Note:

Your solver may include reactions and applied loads as grid point forces and moments. However, post-processing uses only the internal forces and moments as grid point forces and moments.

To obtain grid point force and moment results in the Simcenter Nastran and MSC Nastran environments, in the Structural Output Requests dialog box, under the Grid Point Force tab, select the Enable GPFORCE Request check box..

To obtain grid point force and moment results in the Simcenter Samcef environment, in the Structural Linear Output Requests or Structural Non Linear Output Requests dialog box, under the Grid Point tab, select the Enable Grid Point Force and Reaction Force check box ..

Grid point force and moment results are listed in the Post Processing Navigator as Grid Point Force - Element-Nodal and Grid Point Moment - Element-Nodal.

You can optionally sum or average the grid point force and moment results. To do so, in the Result tab of the Post View dialog box, select Nodes from the Combine At list and then select Sum or Average from the Nodal Combination list.

• If you select Sum, you can select the Exclude Elements Not Displayed check box to restrict the summation to the nodes associated with the elements that are displayed in the post view.You can limit the post view display to a group of elements by using the Show Only command on the group or by turning off individual meshes in the Post Processing Navigator.

• If you select Average, you can optionally subdivide the averaging based on any combination of the material and property IDs of the elements, element type, and feature angle.For more information on these averaging options, see Averaging options for elemental and grid point results.

Arrow plot of grid point forces or moments

You can use an arrow plot to view the individual grid point force or moment contributions at a node. In an arrow plot of grid point forces or moments, each arrow represents the force or moment that an element exerts at a node.

Grid point force shown in arrow plot format with Nodal Combination = None

If you select the Sum option, at nodes without reactions or applied loads, the forces or moments that the elements exert at a node equilibrate one another and they sum to zero. Therefore, no arrows appear at these nodes. At nodes with reactions or applied loads, the forces or moments that the elements exert at a node do not equilibrate one another and their sum is equal and opposite to the reaction or applied load. For these nodes, a single arrow appears at each node to represent the sum of forces or moments that the elements exert on the node.

Grid point force shown in arrow plot format with Nodal Combination = Sum

If you select the Sum option and select the Exclude Elements Not Displayed check box, at the boundaries where some of the elements are excluded, the forces or moments that the remaining elements exert at a node do not typically equilibriate one another. For these nodes, a single arrow appears at each node to represent the sum of forces or moments that the remaining elements exert on the node.

Grid point force shown in arrow plot format with Nodal Combination = None and Exclude Elements Not Displayed check box selected

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Grid point force and moment results, Simcenter 3D 2021.1 Series

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