Dynamic Shear Force on a Brake Pad

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SUMMARY

The discussion focuses on calculating the dynamic shear force on a brake pad when stopping a flywheel. The shear stress is defined as shear force divided by area, applicable in dynamic scenarios. The friction force, which is tangential to the flywheel rim, is influenced by the pressing force on the brake pad and the coefficient of friction between the materials. The braking torque, generated by this friction force, remains constant under moderate speed conditions if the pressing force is stable and braking action is consistent.

PREREQUISITES
  • Understanding of shear stress and shear force calculations
  • Knowledge of friction coefficients for material pairs
  • Familiarity with torque and its relation to rotational motion
  • Basic principles of dynamics and stopping time calculations
NEXT STEPS
  • Research the calculation of shear stress in dynamic applications
  • Learn about the coefficient of friction for various brake pad and flywheel materials
  • Explore methods for calculating braking torque in mechanical systems
  • Investigate techniques for determining stopping time in rotating systems
USEFUL FOR

Mechanical engineers, automotive engineers, and anyone involved in the design and analysis of braking systems will benefit from this discussion.

mkematt96
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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?
 
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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 .
 
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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 ?
 
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