The following comments assume default element dof settings.
In a RBE2, grid 1 is the independent and grids 2-n are dependent. The relative position of grids connected by the element does not change during the analysis.
In a RBE3, grid 1 is the dependent and grids 2-n are independent. Grids 2-n are free to mode relative to each other. The displacement of grid 1 is the weighted average of the displacements of grids 2-n.
RBE2 is used to represent a rigid connection. RBE3 is used for load distribution or a flexible connection.
See R-Type Elements in the Element Library Reference in the online help.
To learn more about RBE2 vs. RBE3 elements take a look to my blog in the following address:
Thank you Karachun!
I am calculating the deflections of a component that is turned on Lathe. I have the cutting forces acting on each point of the component. Since these are point loads, is it correct to use RBE3?
If yes, could you please tell me where to define the point of load? (shall it be the central axis or the point where the cutting tool meets the component)?