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CHAPTER BRAKES AND CLUTCHES 12.0 TABLE OF CONTENTS 12.1 INTRODUCTION 1 12.2 FRICTION MATERIALS 2 12.3 BRAKES 5 12.3.1 Brake Assemblies 5 12.3.2 Brake Varieties 6 12.3.3 Brake Assembly Failure Modes 7 12.3.4 Brake Failure Rate Model 8 12.3.5 Disk / Brake Lining Reliability Model 10 12.3.5.1 Base Failure Rate for Brake Lining / Disk Material 11 12.3.5.2 Brake Type Multiplying Factor 12 12.3.5.3 Dust Contaminant Multiplying Factor 12 12.3.5.4 Temperature Multiplying Factor 13 12.4 CLUTCHES 13 12.4.1 Clutch Assemblies 13 12.4.2 Clutch Varieties 14 12.4.3 Clutch Assembly Failure Modes 15 12.4.4 Clutch Failure Rate Model 15 12.4.5 Clutch Friction Material Reliability Model 17 12.4.5.1 Base Failure Rate for Clutch Lining / Disk Material 18 12.4.5.2 Clutch Plate Quantity Multiplying Factor 18 12.4.5.3 Temperature Multiplying Factor 19 12.5 REFERENCES 20 12.1 INTRODUCTION The principal function of a brake or clutch assembly is to convert kinetic energy to heat and then either to absorb or dissipate heat while simultaneously (through energy transfer) reducing the relative movement between the friction material and the part to which it is engaged. Reliability models for brakes and clutches are presented together in this Handbook because of similar design and operational characteristics; and because one of the most important functional parts of each of these components is the friction material. A discussion of friction materials to achieve the energy transfer Brakes and Clutches <| 2-1 Revision C

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