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Problem with RBE3 in Hyperworks

Hi, i´m working in a analysis in Hyperworks using the Optistruct as a solver

I need to use a remote force in this point beside the geometry and my ideia is to connect the point and the holes with rbe3 elemments, but i´m having these messages

and idk how to proceed, i would like to fix this errors

thank you

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Adriano_Koga

Hi Guilherme,

the solver will error out a message in your case, because your RBE3 needs at least 3 "legs", and non-colinear.

As a very simple example, you can thing about a simple chair where you're going to sit. If there is on 2 legs, it won't keep stable. If you have 3 legs it will be more stable, but if all of them are aligned, then, you loose stability again.

Maybe you could just create a single RBE3 connecting directly the nodes in your holes, instead of adding 3 different ones.

Guilherme Arruda

Hi Guilherme,

the solver will error out a message in your case, because your RBE3 needs at least 3 "legs", and non-colinear.

As a very simple example, you can thing about a simple chair where you're going to sit. If there is on 2 legs, it won't keep stable. If you have 3 legs it will be more stable, but if all of them are aligned, then, you loose stability again.

Maybe you could just create a single RBE3 connecting directly the nodes in your holes, instead of adding 3 different ones.

Hi Adriano,

I was trying to fix the errors, but it still occurs that the elements are colinear

The dependent node is the node i will aply the force and the independents are in the holes

Is it possible to make it non colinear?

thanks for the help

Nkrainer

I have the same error with an RBE3 that's created from 8 radially distributed RBE3 elements around a circle.

But on what direction are they collinear? they don't sit on a same axis.

Does every RBE defines a virtual axis, and these axii are colinear and it causes the problem?

Rajashri_Saha

I have the same error with an RBE3 that's created from 8 radially distributed RBE3 elements around a circle.

But on what direction are they collinear? they don't sit on a same axis.

Does every RBE defines a virtual axis, and these axii are colinear and it causes the problem?

Hi Niv,

Please share your .fem file for investigation.

Thanks

Rajashri