Damping in Brake Rotor Materials With Different Microstructures

Abstract Flexural damping factors and flexural moduli of gray cast iron used for making automotive brake rotors and drums were measured from room temperature up to 700°C. The experiments were realized by the half power bandwidth method and the impulse-frequency response technique. Measurements were conducted on samples with different graphite flake morphologies and different Type A graphite flake sizes. The goal of this research was to study damping behavior and the influence on damping behavior of different morphologies, in order to ascertain that the optimized cast iron microstructure for suppressing brake noise and vibration is used for brake components.