RBE2 or RBE3 for this application?
RBE2 or RBE3 for this application?
(OP)
Assume you have a plate with a rigid box attached to it by 4 screws. Using the location of center of mass of the box you place a node or 0d mass there, apply a load or other applied forces (direction doesnt matter). Would you use an rbe2 or rbe3 from the cg to the bolts?





RE: RBE2 or RBE3 for this application?
If it is metallic, then I would put RBE2.
I'm assuming the plate rigid like plastic, metal or glass.
But if you are doing a modal analysis, you might wanna model more detail.
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: RBE2 or RBE3 for this application?
In general in such situations I will always use RBE3 elements. The RBE3 element is a powerful tool for distributing applied loads and mass in a model. Unlike the RBAR and RBE2 elements, the RBE3 doesn’t add additional stiffness to your structure. Forces and moments applied to reference points are distributed to a set of independent degrees of freedom based on the RBE3 geometry and local weight factors.
To learn more about rbe2 vs. rbe3 you can visit my blog in the following address:
https://iberisa.wordpress.com/2015/10/13/rbe2-vs-r...
Best regards,
Blas.
~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director
IBERISA
48004 BILBAO (SPAIN)
WEB: http://www.iberisa.com
Blog de FEMAP & NX Nastran: http://iberisa.wordpress.com/
RE: RBE2 or RBE3 for this application?
http://www.eng-tips.com/viewthread.cfm?qid=405761
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer
RE: RBE2 or RBE3 for this application?
As the OP mentioned "rigid box" in his post, the best representation of this is using a RBE2 from the cog of the box connected to the mounting points.
Usually using Tx,Ty and Tz as the dependent d.o.f's at the mounting points would suffice, unless you claim that the joint can carry moments.
RE: RBE2 or RBE3 for this application?
Spaceship!!
Aerospace Engineer, M.Sc. / Aircraft Stress Engineer