Distributed Load
Distributed Load
(OP)
I am trying to model a distributed load for Nastran analysis. The shape is a hollow cylinder covered with rubber from inside. I have no idea about the rubber stiffness properties and thats why I ingore the rubber part and would like to use RBE2, RBE3 or some other element to simulate the force acting on the cylinder. This is a normal mode analysis and RBE2 make the piece pretty rigid. Whereas RBE3 needs to be weighted and I am not familiar with it. Is there a better way to go with? Thanks.





RE: Distributed Load
What is the force acting on the cylinder? Internal pressure? A distributed load or pressure is generally very simple to apply in any FE pre-processor, what software are you using to create the Nastran deck?
RE: Distributed Load
I am using Hypermesh for modelling.
RE: Distributed Load
When stiffness is important as in dynamic analysis and stress is of no real concern then an RBE3 element is an acceptable substitute for not modelling the actual structure if it is correctly percieved to have no substantial effect on the outcome of the analysis.
The RBE2 element is still best avoided, as you discovered, since they introduce infinite stiffness into the model. In a static analysis they create rubbish stress results.
RE: Distributed Load
RE: Distributed Load