This paper discusses the application of an air-coupled ultrasonic non-destructive evaluation (NDE) method for aircraft braking materials. The main objective of this research work was to identify and characterize flaws such as delaminations, cracks, porosity (resin pockets), and disbonds in commercial Carbon/Carbon (C/C) composite aircraft brake disks.Air-coupled ultrasonic testing (ACUT) method was applied for the inspection of commercial C/C brake disks. Several tests were performed by using various air-coupled ultrasonic transducers at center frequencies 50, 120, 125, 225, 400, and 436 kHz in a through-transmission mode by varying scan increments and resolutions. It was found that a testing frequency of 125 kHz provided the best results for commercial C/C composite aircraft brake disks. The relative through-transmitted ultrasonic signal drop in the defect areas was around −18 dB which allowed for easy distinction of abnormal regions within the C/C brake disks. In addition, material inhomogeneity within the C/C brake disks was also revealed by the ACUT C-scan results.


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    Title :

    Application of Ultrasonic Non-Destructive Evaluation in Braking Materials


    Additional title:

    Sae Technical Papers


    Contributors:
    Poudel, Anish (author) / Filip, Peter (author) / Chu, Tsuchin (author)

    Conference:

    SAE 2012 Brake Colloquium & Exhibition - 30th Annual ; 2012



    Publication date :

    2012-09-17




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Application of Ultrasonic Non-Destructive Evaluation in Braking Materials

    Poudel, A. / Chu, T. / Filip, P. et al. | British Library Conference Proceedings | 2012




    Non-destructive Evaluation of Metal Matrix Composite by Ultrasonic Measurement

    Park, Y. C. / Kim, H. S. / Jeon, E. C. et al. | British Library Conference Proceedings | 1994