Stiffness matrix extracted from .full in workbench
I extract the stiffness matrix and mapping file but I don't know why the result of nodeID 40001 and 40002 appear. The model is meshed automatically. Node number is 51 and element number is 4. The model is condensed to a node, whose ID is 1, and a face, which is fixed, by Condensed Part. In the mapping file, nodeID 40001 and 40002 appear as shown in the figure. Why do they appear, and what do their stiffness values mean?
Answer to the question will be very helpful.