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thomas100

how to assign property to RBE and rigid elements

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Hi,


 


Are RBE and rigid zero dimensional elements? If they have zero dimension, is it right that I dont need to assign any property into them when mesh is generated for weld?


Please see the attachment for weld area.


 


Many thanks


post-7386-0-16690400-1372671349_thumb.jp

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Hi,


 


you are right, you don't need any property for RBE3/RBE2.


 


I suggest to use RBE2 elements for your type of connection (since it is a rigid element and typically for weldings as you are using)!


 


Regards,


Mario


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Hi Mario,


 


Tnaks for your suggestion. I just tried and it works perfect. 


But, as far as I can see from the model, there arent any difference between RBE2 and RBE3. Can you please indicate the difference between them?


 


Many thanks.


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Hi Thomas,


 


The both element types are more or less complete different.


 


 


RBE2 – Rigid Body Element


Defines a rigid body whose independent 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.


 


RBE3 – Interpolation Constraint Element


Defines the motion at a "reference" grid point as the weighted average of the motions at a set of other grid points.


 


 


RBE2 are transfering displacements/rotations and are complete rigid.


RBE3 are transfering forces and moments and are not rigid.


 


I don't want to write more then this here, but feel free to look at the manuals and internet for more informations.


 


Regards,


Mario

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Hi, 

 

Although this topic is called "how to assign property to rbe and rigid elements", what I would like to know is the opposite: how to remove an assignation I seem to have done to some RBE3 without being aware of it. I realized I had made a mistake when i showed the model by property, and also by material, and these elements didn't appear in grey colour. 

 

Thank you for your help,

 

Julio

rbe3Error.png

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Hi,

 

if material and property were assigned indirectly (on component) just create new component and move RBE3 elements with Organize panel (shift+F11).

If material and property were assigned directly (by right-clicking property then assigning elements) go to toolbar button Property Collectors panel>assign>unassign.

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