I am having some trouble setting up the forces and constraints in a model for an auger I am working on. The auger is going to be mixing a substance and it was found that it needs 60 in-lbs of torque to move at the desired speed. I want to model the situation in order to look at the stresses in the shaft. This is what I have so far:

http://i.imgur.com/5n9tn.png

http://i.imgur.com/k0Dj8.png

In the first link I constrained the model at the top face (although there is a small hole near the top which a shear pin will be placed. Not sure if I should constrain it on that inside face instead?). The second image shows a closer view of the forces I have put onto the model. Since the auger blade is split up into two different directions, I figured I needed to put two forces on the faces of the blade depending which way the fluid was pushing on it. I also added a torque to the bottom face of the model. Would this be a correct setup for the situation? I am also unsure of the forces I should be putting on the faces of the blades. I'm not sure if putting the same force on the entire face is a correct way to do it.