how to find Torque produced in shaft when pressure applied on the plate attached to that shaft

Hello,

I am working on model of pressure plate which have axis offset. A shaft passes through it. when pressure applied (in x-y) on the pressure plate due to the offset one side of pressure plate will have more pressure. Which causes rotation on around z axis. As the shaft passes through z-axis. Shaft and pressure plate are bolted. As pressure plate will rotate it will tend to rotate the shaft. I want to find out for particular pressure how munch is torque is generated.

Preliminary analysis:

i have made freeze contact between shaft and pressure plate. Gave dof only z rotation for the shaft. Applied pressure on the plate. I have got only stress and deformation. No angular movement in shaft.

How to solve this problem

Thanks.