NDLI: Thermographic characterization of impact damage in sic/sic composite materials

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Thermographic characterization of impact damage in sic/sic composite materials

Content Provider	NASA Technical Reports Server (NTRS)
Author	Cosgriff, Laura M. Fox, Dennis S. Bhatt, Ramakrishna Choi, Sung R.
Copyright Year	2005
Description	SiC/SiC composite materials targeted as turbine components for next-generation aero-engines are being investigated at NASA Glenn Research Center. In order to examine damage mechanisms in these materials, SiC/SiC coupons were impacted with 1.59 mm diameter steel spheres at increasing velocities from 115 m/s to 400 m/s. Pulsed thermography, a nondestructive evaluation technique that monitors the thermal response of a sample over time, was utilized to characterize the impact damage. A thermal standard of similar material was fabricated to aid in the interpretation of the thermographic data and to provide information regarding thermography system detection capabilities in 2.4 mm thick SiC/SiC composite materials. Flat bottom holes at various depths with aspect ratios greater than 2.5 were detectable in the thermal images. In addition, the edges of holes at depths of 1.93 mm into the sample were not as resolvable as flat bottom holes closer to the surface. Finally, cooling behavior was characterized in SiC/SiC materials and used to determine impact damage depth within an 8.5% error of a known depth.
File Size	1043701
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20050182603
Archival Resource Key	ark:/13960/t24b81w3k
Language	English
Publisher Date	2005-02-15
Access Restriction	Open
Subject Keyword	Nondestructive Tests Damage Assessment Ceramic Matrix Composites Silicon Carbides Aspect Ratio Edge Detection Impact Damage Depth Holes Mechanics Thermography Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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