高速in situ観察・AE計測法を用いたブレーキパッド材料のトライボロジー現象の可視化

抄録

If we could understand the relationship between acoustic emission (AE) signals and frictional properties of brake pads, the complex frictional properties of brake pads could be evaluated from measuring the AE signals. In this study, the relationship between AE signals (mainly, the AE frequency spectrum) and tribological phenomena on brake pad materials was examined by a high-speed in situ observation and AE measurement method. The in situ observation experiments were performed with faster sliding velocity than conventional experiments by sliding a flat tip pin (rotor material) on a block (brake pad material). It was found from the high-speed in situ observations that the microscopic deformation and fracture between the sliding surfaces, a crack growth and separation of brake pad materials, abrasion of the rotor material, and adhesion of metallic fiber to the rotor material, could be identified from the frequency spectrum of the AE signal waveforms.