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Effect of RBE3s on stiffness

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Hello,

 

If I am to put RBE3 in a hole (with no force or constraint attached to the dependant node) will this imply any stiffness to the voids outer surface where the independent nodes are?

Or does the hole just remain as it would if it was a void with nothing in it?

 

 

What type of 1D element could be used to provide a defined stiffness to the outer surface of a hole?

 

Thank you in advance

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Hi all,

 

Thank you for your responses. This has helped with my understanding.

 

9 hours ago, tinh said:

I suggest you try modeling a shaft and make it contact tied with hole of bracket

If I am to try to model a bearing I will use this method.

 

3 hours ago, Sanjay Nainani said:

If you have particular stiffness values you want the hole to have, you can also try using GAP elements or CBUSH.

I do have a radial stiffness value. I will try and use these elements and input the stiffness values. Is it possible to use CBUSH or GAP elements as a spider that is constrained in the middle (like a RBE2 or 3 element spider)?

 

Thanks

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Hi @tinh,

 

I did try both methods.

The panels for spring and bar elements do not have an option to create a 'calculated node' from nodes selected on a surrounding face - like there is with the rigid and RBE3 element panels.

Hence, my question was, is it possible and if so, how?

 

Thank you

 

 

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Hello,

 

Thank you for your responses. I will create the centre node using this method.

However, is it possible to select all the surface nodes on the inner surface of the hole in one go?

As from what I can tell I will have to select each node individually and connect this to the centre node to create a spider.

 

Thank you

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Thanks @Tinh,

 

I came across this, but it seems to just be available to Altair clients - which I am not.

https://forum.altairhyperworks.com/index.php?/topic/13205-hyperworks-script-exchange/

 

Is there a better/easier way to add a defined amount of (radial) stiffness to a cylindrical hole?

 

Thank you

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