- Mapdl.nforce(item='', **kwargs)¶
Sums the nodal forces and moments of elements attached to nodes.
APDL Command: NFORCE
Specifies the selected set of nodes for summing forces and moments for contact elements.
- (blank) - Sums the nodal forces of elements for all selected nodes and excludes contact
elements (elements 169-177).
CONT - Sums the nodal forces of elements for contact nodes only.
- BOTH - Sums the nodal forces of elements for all selected nodes, including contact
Sums and prints, in each component direction for each selected node, the nodal force and moment contributions of the selected elements attached to the node. If all elements are selected, the sums are usually zero except where constraints or loads are applied. The nodal forces and moments may be displayed [/PBC,FORC and /PBC,MOME]. Use PRESOL to print nodal forces and moments on an element-by-element basis. You can use the FORCE command to specify which component (static, damping, inertia, or total) of the nodal load is to be used. Nodal forces associated with surface loads are not included.
This vector sum is printed in the global Cartesian system. Moment summations are about the global origin unless another point is specified with the SPOINT command. The summations for each node are printed in the global Cartesian system unless transformed [RSYS]. This command is generally not applicable to axisymmetric models because moment information from the NFORCE command is not correct for axisymmetric elements.
Selecting a subset of elements [ESEL] and then issuing this command will give the forces and moments required to maintain equilibrium of that set of elements. The effects of nodal coupling and constraint equations are ignored. The option ITEM = CONT provides the forces and moments for the contact elements (CONTA171, CONTA172, CONTA173, CONTA174, CONTA175, CONTA176, and CONTA177). Setting ITEM = BOTH provides the forces and moments for all selected nodes, including contact elements.
This command also includes the FSUM command function which vectorially sums and prints, in each component direction for the total selected node set, the nodal force and moment contributions of the selected elements attached to the selected node set.