Dynamic Shear Force on a Brake Pad

[mkematt96]

I'm looking for a way to calculate the shear force applied to a brake pad from stopping ( a small engine brake pad stopping a fly wheel). I know shear stress is shear stress/ area , would this apply for a dynamic application as well? Would I need to calculate the force to stop the flywheel at a specific speed then apply it to that equation?

 

[Nidum]

There is a force pressing the brake pad against the flywheel rim .

There is a friction force between the flywheel rim and the brake pad which acts tangentially to the flywheel rim and in a direction which will tend to retard the motion of the flywheel .

The magnitude of the friction force depends on the magnitude of the force pressing the brake pad against the flywheel rim and on the coefficient of friction for the material combination of the flywheel rim and brake pad .

The tangential friction force acting on the flywheel rim generates a torque about the flywheel central axis . This is the braking torque .

 

[Nidum]

If the force pressing the pad down on the flywheel does not change and the braking action does not fade then the braking torque can reasonably be considered as constant in moderate speed applications .

Can you see now how to find the stopping time for a real flywheel and brake pad system ?