Corrosion tests of discs were carried out in an environmental chamber, simulating in-vehicle situation, and torque variation during braking was measured using a single-end brake dynamometer. A friction model was introduced to confirm the pattern of to...
Corrosion tests of discs were carried out in an environmental chamber, simulating in-vehicle situation, and torque variation during braking was measured using a single-end brake dynamometer. A friction model was introduced to confirm the pattern of torque variation. Ingredients in a friction material were substituted to series of springs and dashpots in this model. The velocity of the brake disc and the strength of the friction layer representing the existence of corrosion layer ware calculated as a variable. Results showed that the friction film and moisture content strongly affected the amount of corrosion. The dynamometer results also showed that the existence of the corrosion layer affected brake torque variation, and this result was confirmed by the friction model. The model showed that the amount of the torque variation increased when the corrosion layer existed and when the amount of ingredients with high stiffness increased at the fixed velocity. This suggested that the strength of corrosion layer and the transition of iron oxide particles were crucial factors for the corrosion induced torque variation.