How to read stress adjacent to rigid elements?
How to read stress adjacent to rigid elements?
(OP)
Hi,
In nastran, rbe2 is often used to simulate weld and bolt. How to read stress on elements(shell or solid) connected to RBE? The value ot these elements is not right?
Stress is complicated to me. Diffrent average methods result in deiffrent stress value. The max Von mises & max strain locates on same elements(one kind material model),right?
Thanks for your answer.
In nastran, rbe2 is often used to simulate weld and bolt. How to read stress on elements(shell or solid) connected to RBE? The value ot these elements is not right?
Stress is complicated to me. Diffrent average methods result in deiffrent stress value. The max Von mises & max strain locates on same elements(one kind material model),right?
Thanks for your answer.





RE: How to read stress adjacent to rigid elements?
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: How to read stress adjacent to rigid elements?
As Greg Locock pointed out, stresses near rigid elements are not realistic. One method to improve the results is to determine the reaction forces at the fixed elements, and then use these to change the constraints on the model, i.e. remove the rigid constrain and use reaction forces to maintain equilibrium. I'm sure there are other methods that can be found by googling "finite element bolt" or "finite element weld" possibly with some additional terms such as fixity, constraint, rigid, etc.
RE: How to read stress adjacent to rigid elements?
RE: How to read stress adjacent to rigid elements?
GBor's approach is the usual one, but it locks up the elements in the spider.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: How to read stress adjacent to rigid elements?