Force predicted in 1 direction on cbushes where one would expect nothing

[JBlack68]

I am playing around with a test case to check something. See attached .dat file. I modelled a plate with some connections (CBUSH) and applying a Force FX=1000N on the edge of the plate. 2 of the “fixings” are only carrying shear load (X&Y). I deliberately offset these 2 “fixing” as part of the test. Because I am only applying FX I expected the force in these cbushes to be only fx i.e. no fy. The fx forces I am getting agree with the simple hand calc but I do not understand why I am getting a fy force

Any ideas or suggestions?

Thanks
Regards
JXB0809

 

[stressebookllc]

Poissons?

http://www.stressebook.com

Stressing Stresslessly!

 

[nlgyro]

a combination of:

1.Poisson effect
2. CBUSH elements given high stiffness in Y-dof
3. RBE2 constrained in Y-dofs

Try reducing the stiffness for the CBUSH's in the Y-dof to something in the order of 1.00 (units) to get numerically zero loads in that dof.