Fixed Surface Rotation in a Model

[gregorio66]

I need to fix a couple faces in my model to keep them from rotating in certain degrees of freedom. However, when I go attempt to use the fixed surface option (highlight Environment, click Structural) it is grayed out. Is this an assembly only feature? How can I use this feature? I think I am doing a 3D Simulation as I imported my model from Solidworks and am applying loads/constraints to that. Any help is greatly appreciated.

 

[gregorio66]

Anyone? I really need some help.

Thanks.

 

[Stringmaker]

Is your model meshed?

 

[gregorio66]

Yes it is constrained. I have done some sizing controls and things of that sort. I have tried this constraint with two different types of analysis. One using a singe model for geometry with no contact and one using several models (assembly) with contact points. I use Solidworks as my 3D CAD program. Neither of these attempts yielded being able to use the fixed surface rotation option.

 

[Stringmaker]

Is rotation a valid DOF for the elements you're trying to constrain? Solid elements can only be constrained in translational DOF.

 

[gregorio66]

I am designing hubs that are constrained by a double raced tapered roller bearing. Therefore I need to constrain rotation about that bearing face on the hub. What degrees of freedom does a fixed support constrain (3 translational and 3 rotational if I am correct)? I am importing geometry from Solidworks, a 3D modelling system. Are these models considered a solid element?