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Supports in Inspire: Rotational constraint

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Hello,

since you have attached the constrainst to a solid, you have only translation DOFs.

Solids are generally meshed with Tetras, these elements havn't rotatory DOFs.

 

You can check it by attaching a constraint to a surface, now you can see them...

 

Best Regards,

Mario

DOF.PNG

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It's very simple, you draw a simple line on the existent part. If you finishing the tool, this surface is splitted...

Normal constrain is the standard constrain for solids, as you have shown in the first post. Since all nodes on the surface are constrained in translation, the rotations are also not possible (force pairs).

 

 

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Hello,

 

since you have now constrained translation dofs on more then one row of nodes (all nodes on the small surface), the rotations are fixed by this translations.

But try it, you will see ;-)

 

Best Regards,

Mario

 

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Hi Mario,

1. What if I assign the supports in the following way? I do not need to cut small strips, instead I have just assigned them to the face directly.

2. Another question, the supports are free to translate in Y, the rotation is free too or fixed?

 

7.jpg

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Hello,

1. You can constrain a full surface of course. You need the stripes only if you want to have local constraints.

2. You model have rigid body modes and is so far singular (since translation in Y are free). Rotations about Y are constrained, Rotations about X and Z are free at the moment.

 

Best Regards,

Mario

 

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Hi Mario,

I there any way I can define the plate as rigid body?? I actually do not want any rotations.

 

Desired Boundary Conditions for the whole plate (not just the faces) -

[Ux = Uz = 0, Uy = free]

[Rx = Ry = Rz = 0]

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