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The Evolution of Nondestructive Evaluation Methods for the Space Shuttle External Tank Thermal Protection SystemThree nondestructive evaluation methods are being developed to identify defects in the foam thermal protection system (TPS) of the Space Shuttle External Tank (ET). Shearography is being developed to identify shallow delaminations, shallow voids and crush damage in the foam while terahertz imaging and backscatter radiography are being developed to identify voids and cracks in thick foam regions. The basic theory of operation along with factors affecting the results of these methods will be described. Also, the evolution of these methods from lab tools to implementation on the ET will be discussed. Results from both test panels and flight tank inspections will be provided to show the range in defect sizes and types that can be readily detected.
Document ID
20060014008
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Walker, James L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Richter, Joel D.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Spacecraft Design, Testing And Performance
Meeting Information
Meeting: American Society for Nondestructive Testing 2006 Spring Conference
Location: Orlando, FL
Country: United States
Start Date: March 13, 2006
End Date: March 17, 2006
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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