Notes on Free body forces
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Free body forces are just forces that are applied to surfaces, edges or points to maintain
equilibrium.
For bonded surfaces, the edges of the bond will tend to give the correct value for the
transferring of forces
There is no real meaning in the forces IF a lot of faces are interacting with each other
The only thing is that if the calculation is correct, for the entire body, the sum of forces
should be close to zero. This means that the system is in equilibrium.
Notes on pin connectors
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Axial forces are only used if there is some spring or resistance to motion
If there is no resistance, just free moving, there the axial or rotation stiffness will be zero.