What is the difference between RBE2 and RBE3?
In the case of an RBE2, the motion observed at the independent node governs the motion that occurs at all of the dependent nodes. In other words, the motion of the Dependent Node of an RBE3 is calculated by taking the weighted average of the motion of the many Independent Nodes.
What is an RBE2?
Description. The RBE2 entry defines a rigid body whose degrees of freedom are specified at a single grid point and whose dependent degrees of freedom are specified at an arbitrary number of grid points. This option allows you to create a rigid body by giving a list of grid points.
What’s the difference between RBE2 and rbe3?
RBE2 adds infinite stiffness to attached nodes which means both nodes to exactly the same displacement whereas RBE3 is an interpolation element and distributes the loads and the mass depending on the length. Depending on the application one of these rigid elements should be used.
Is it OK to use rbe3 elements in Nastran?
In their usage they have friends and foes. For one highly experienced Nastran engineer that I know, the use of RBE3 elements is generally prohibited among their crew simply due to their ability to suck the life (i.e., load) out of a standard analysis run and such death-inducing ability is often reason enough to just say “no” to their usage.
What are the active degrees of freedom of RBE2?
RBE2 — The active degrees of freedom of the single core node (independent) enforce the active degrees of freedom of the leg nodes (dependent). Therefore, the active degrees of freedom of all nodes included in an RBE2 element are considered rigidly connected. (1) independent node (2) dependent nodes
What is the thermal capability of the RBE2 connection?
The thermal CTE capability of the RBE2 connection will also be covered for completeness. Lastly, the CBUSH element will be introduced and applications given on how to use this replacement for the CELAS element. The downfalls on using this element will be discussed and also why this element is a useful as a companion to the RBE2 and RBE3 elements.