Rigid Elements + beam + Sol 401 1

[wojtekmath]

Hi

I have a problem:
I made beam model. ( i use only a beam elements)
I would made a rigid element between elements on beams.
In rigid options i check only TY.
I used sol 401.

Results:
It looks like it is "Full" rigid (TX TY TZ RX RY RZ).

If I uncheck everything it still work like "full" rigid

 

[wojtekmath]

 

[karachun]

Can you upload an archive with your model in neutral format so we can check it precisely.

 

[wojtekmath]

I made this analise using sol 402 and with this analise type is OK.
With sol 106 also is fine.

 

[BlasMolero]

Dear Wojtekmath,
The issue is the modeling of the RBE2 with large displacements. The SOL401 RIGID=AUTO setting will select the RIGID=STIFF option when LGDISP=1. With this option, the RBE2 legs are each replaced with a stiff beam.
If you run with the RIGID=NONLIN option, the RBE2’s will be represented with nonlinear MPC’s and the solution will complete successfully, with accurate results.

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/

 

[wojtekmath]

Hello,

Thanks for answers. I made the tests and it work corectly when i use Rigid Element Method: LINEAR.
When i use Rigid Element Method: Nonlin, it work like full rigid (TX TY TZ RX RY RZ)

 

[wojtekmath]