Connection for a moving floor 2

[ThomasH]

Hello

I have a question regarding someting that bugs me.

I am designing a moving floor, basically a loading arrangement. I have a fixed part of the floor and the moving part of the floor rotates around the connection to the fixed floor. The moving floor can be flat but is more often an inclined ramp.

The floor structures are typical beam systems and the connection consists on two plates on the fixed side and one plate on the moving side. The moving plate fits between the plates on the fixed side. And then there is a circular axle connection that makes rotation (movement) possible.

And this is what bugs me because I can't find a simple formula that gives med the contact pressure between the axle and the plates with holes. This must have been done millions of times before FEA . I could do an analysis with contact etcetera but I still would like to check it and I have no means of doing that except hand calculation and assumptions.

Does anybody have a link to some useful information? It would be appreciated.

I have treated the axle as a circular beam. I don't know if that is oversimplifying.

Best regards
Thomas

 

[Scuka]

C'mon people, sketches convey a hundred times more information than several paragraphs of text describing your setup.

I have treated the axle as a circular beam.

From your description, it seems your axle would also transmit torque, so you can't just treat is like a beam.

 

[ThomasH]

Hello again,

First I should apologize. I agree that a sketch is helpful but the structure is proprietary, so I just wanted to give a general overwview . But I should have mentioned this in my first post.

The main question is the contact pressure between an axle and the surrounding hole.

As for the axle, I have treated it as a beam with bending, shear and torque. The torque is due to friction.

Thank you

Thomas

 

[Scuka]

I believe the term you're looking for is bearing pressure / bearing stress.

https://engineeringlibrary.org/reference/bearing-stress-air-force-stress-manual

 

[ThomasH]

Yes, that looks exactly correct.

Thanks a lot.

Thomas