1 November 2007 Airborne ultrasonic inspection in carbon/carbon composite materials
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Proceedings Volume 6423, International Conference on Smart Materials and Nanotechnology in Engineering; 64232W (2007) https://doi.org/10.1117/12.780023
Event: International Conference on Smart Materials and Nanotechnology in Engineering, 2007, Harbin, China
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.
© (2007) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
In-Young Yang, In-Young Yang, Young-Hun Kim, Young-Hun Kim, Je-Woong Park, Je-Woong Park, David K. Hsu, David K. Hsu, Song-Jin Song, Song-Jin Song, Hyun-Jun Cho, Hyun-Jun Cho, Sun-Kyu Kim, Sun-Kyu Kim, Kwang-Hee Im, Kwang-Hee Im, } "Airborne ultrasonic inspection in carbon/carbon composite materials", Proc. SPIE 6423, International Conference on Smart Materials and Nanotechnology in Engineering, 64232W (1 November 2007); doi: 10.1117/12.780023; https://doi.org/10.1117/12.780023

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