Use friction to connect shafts or dissipate kinetic energy.
Friction clutches transmit torque T=μNR_m n; brakes convert kinetic energy to heat. Design checks torque capacity, wear, heat dissipation and temperature rise. Disc, drum and band types are common.
Car brakes stop 1500 kg from 100 km/h dissipating about 580 kJ.
Clutches and brakes control power flow by friction, and their design sets how quickly a system can start, stop or engage.
Use friction to connect shafts or dissipate kinetic energy.
Clutches and brakes control power flow by friction, and their design sets how quickly a system can start, stop or engage.
The friction coefficient, the clamping force and the effective radius of the friction surface.
Friction converts the kinetic energy into heat at the pads or discs, so heat capacity and cooling are key design limits.
Typical applications include sizing a brake for a lift that must stop under full load, choosing a clutch for a car gearbox that engages smoothly and designing a disc brake to absorb the kinetic energy of a moving vehicle.
Study "Welded joints" first (topic 92 of 106 in Engineering Mechanics). It covers the groundwork this topic builds on.
Uniform wear vs uniform pressure. Heat fade. Regenerative braking in EVs.
Car brakes stop 1500 kg from 100 km/h dissipating about 580 kJ.
The next topic is "Flywheels", which builds directly on this one.
It is classed as Advanced in Engineering Mechanics (topic 93 of 106). It is an advanced topic. It assumes you are comfortable with the intermediate topics in Engineering Mechanics.
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