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Proceedings Paper

Airborne ultrasonic inspection in carbon/carbon composite materials
Author(s): In-Young Yang; Young-Hun Kim; Je-Woong Park; David K. Hsu; Song-Jin Song; Hyun-Jun Cho; Sun-Kyu Kim; Kwang-Hee Im
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Paper Abstract

In this work, a carbon/carbon (C/C) composite material was nondestructively characterized with non-contact ultrasonic methods using automated acquisition scanner as well as contact ultrasonic measurement because (C/C) composite materials have obvious high price over conventional materials. Because of permeation of coupling medium such as water, it is desirable to perform contact-less nondestructive evaluation to assess material properties and part homogeneity. Also through transmission mode was performed because of the main limitation for air-coupled transducers, which is the acoustic impedance mismatch between most materials and air. Especially ultrasonic images and velocities for C/C composite disk brake was measured and found to be consistent to some degree with the non-contact and contact ultrasonic measurement methods. Low frequency through-transmission scans based on both amplitude and time-of-flight of the ultrasonic pulse were used for mapping out the material property inhomogeneity. Measured results were compared with those obtained by the motorized system with using dry-coupling ultrasonics and through transmission method in immersion. Finally, results using a proposed peak-delay measurement method well corresponded to ultrasonic velocities of the pulse overlap method.

Paper Details

Date Published: 1 November 2007
PDF: 7 pages
Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232W (1 November 2007); doi: 10.1117/12.780023
Show Author Affiliations
In-Young Yang, Chosun Univ. (South Korea)
Young-Hun Kim, Mokpo National Univ. (South Korea)
Je-Woong Park, Chosun Univ. (South Korea)
David K. Hsu, Iowa State Univ. (United States)
Song-Jin Song, Sungkyunkwan Univ. (South Korea)
Hyun-Jun Cho, Sungkyunkwan Univ. (South Korea)
Sun-Kyu Kim, Iksan National College (South Korea)
Kwang-Hee Im, Woosuk Univ. (South Korea)

Published in SPIE Proceedings Vol. 6423:
International Conference on Smart Materials and Nanotechnology in Engineering
Shanyi Du; Jinsong Leng; Anand K. Asundi, Editor(s)

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