Simulation of a krouse specimen (cantilever beam type fixed at one end and loading in other end)

Hello,

I conducted a simulation on a Krouse specimen, which is a cantilever type, fixed in a clamped region and loaded at the other end.

The purpose was to observe the maximum bending stress in a pure bending scenario where no shear stress component is expected.

To ensure pure bending, I applied constraints to restrict all degrees of freedom by implementing multiple possible boundary conditions.

Despite applying all possible constraints at the fixed end, the simulation results show shear stress. although its magnitude is not significant in terms of Von Mises stress it is still unexpected.

Could anyone explain this situation? I would appreciate any insights.

The second question is: The force was applied perpendicularly in the negative Y direction. How is it distributed to the X and Y directions, even though the components in these directions are very very low?