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Correctly applying boundary conditions for a spherical joint - simulation

Question asked by James Smart on Nov 10, 2014
Latest reply on Nov 14, 2014 by Jared Conway

Hi, I'm a new user to the forum, any help is much appreciated.

 

I'm trying to determine peak stress in a lower wishbone insert. The part has a compound load case applied, one leg of the wishbone in tension, one in compression, and a load on the mount bracket in double shear through the pushrod, see below.

In practice, the only constraint is that the spherical joint cannot translate, but rotation is permitted in all axes. Initially, I applied an advanced fixture on the spherical face which mimics the internal surface of the bearing housing, and applied the condition that radial displacement must equal zero. With this applied, the insert appears to displace correctly given the applied forces, yet I get huge artificial stress concentrations around the inside circumference of the spherical surface, see below.

 

The above result is achieved if I use an adaptive loop mesh. With a generic, fine mesh, the following is achieved.

 

 

I'm sure this isn't an uncommon thing to try and simulate, so hopefully there is a way to do this. In the meantime I am attempting to simulate the assembly, with the bearing included, using component contact fixtures and attempting the simulation by fix the bearings 'ball' instead.

 

Again, any advice welcome, thanks in advance.

 

James

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