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Research into the Fundamentals of Friction in an Automotive Brake system

Research into the Fundamentals of Friction in an Automotive Brake system. Brake pads apply clamping force normal to the surface of the rotor via a hydraulic piston Normal force between two solid in relative motion produce friction

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Research into the Fundamentals of Friction in an Automotive Brake system

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  1. Research into the Fundamentals of Friction in an Automotive Brake system • Brake pads apply clamping force normal to the surface of the rotor via a hydraulic piston • Normal force between two solid in relative motion produce friction • Automotive brake systems utilize this concept to control and stop vehicle motion with operator input to a hydraulic system

  2. Pad-Rotor Contact • Primary contact plateaus initiate real area of contact (50 – 500 μm) based on average pad area of 5000 mm2 • Secondary plateaus develop as debris is collected between primary plateaus

  3. Tribofilm • Within a thin layer on top of the secondary plateaus, a tribofilm of very dense and sintered debris forms. This tribofilm has hardness close to that of the structural fibers of the pad; while the rest of the secondary plateau below this film is much softer

  4. Load Effects on Contact

  5. Thermo Influence in Brakes Almost all braking energy is dissipated in the form of heat Variation in coefficient of friction due to heat: • Material strength at elevated temperatures • Oxide lubrication

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