Brake pads are composite materials made from dozens of ingredients intended to simultaneously satisfy various performances such as brake effectiveness, wear, noise and vibrations. For this reason, the friction phenomena that occur during braking are complicated. It is important to clarify the friction phenomena, but that is not easy because the associated complexities as mentioned above.We looked to acoustic emission (AE) as an online evaluation method of friction phenomena. AE is a non-destructive testing method that measures elastic stress waves caused by the deformation and fracturing of materials. In fact, it has been reported that the difference between abrasive wear and adhesive wear of a metal can be identified from the change in the frequency spectrum of AE signals. In this study, we verify whether differences in the friction phenomena of brake pads are detectable by the AE method.Three kinds of brake pads were used in the experiments. One of the specimens included an abrasive ingredient, one included an adhesive ingredient, and another included neither. As an analysis of the AE signals from the abrasive pad revealed harmonic signals, it is thought that those signals were caused by the detachment of the tribofilm, not abrasive wear. On the other hand, 600 kHz signals were detected in the adhesive pad. It is thought that those signals were caused by adhesive wear. And, the incidence of the AE signals was different depending on temperature.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Evaluation of Friction Phenomena of Brake Pads by Acoustic Emission Method


    Additional title:

    Sae Int. J. Commer. Veh


    Contributors:

    Conference:

    SAE Brake Colloquium & Exhibition - 32nd Annual ; 2014



    Publication date :

    2014-09-28


    Size :

    7 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    The Friction and Wear of Brake Pads

    Magario, A. / Kato, T. / Society of Automotive Engineers of Japan | British Library Conference Proceedings | 1993


    New Type Friction Material for Brake Pads

    Mizuno, M. / Narazaki, S. / Shimase, O. et al. | British Library Conference Proceedings | 2001


    METHOD FOR MANUFACTURE OF FRICTION MATERIAL FOR BRAKE PADS AND BRAKE PAD

    BERENT VLADISLAV VALENTINOVICH | European Patent Office | 2018

    Free access

    Controlled friction additives for brake pads and cluchtes

    Schiefer,H.M. / Kubczak,G.V. / Dow Corning,US | Automotive engineering | 1979


    Controlled Friction Additives for Brake Pads and Clutches

    Kubczak, George V. / Schiefer, Harry M. | SAE Technical Papers | 1979