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trailer hitch boundary conditions?

Question asked by Sean Johnson on Oct 4, 2018
Latest reply on Oct 4, 2018 by James Riddell

I'm analyzing a two wheel cart that looks a lot like one of those small two-wheel motorcycle trailers.  It has a body that attaches to the trailer frame with some sheet metal brackets.  I'm concerned with bracket stresses with a high load on one side of the trailer (someone standing on it).

 

I need to analyze the brackets between trailer body support and the trailer frame.

 

The boundary conditions for the wheels are easy.   But how to model the hemispherical trailer hitch?  It can rotate, but can't deflect vertically.

 

Right now I have the edge of a hole restrained vertically and horzontally, but it's artificially stiffening the hitch end against rotation along the long trailer axis.  I think that's causing artificially high stresses in the body support.

 

Any help appreciated.

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