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NDE Methodologies for Composite Flywheels CertificationManufacturing readiness of composite rotors and certification of flywheels depend in part on the maturity of nondestructive evaluation (NDE) technology for process optimization and quality assurance, respectively. Capabilities and limitations of x-ray-computed tomography and radiography, as well as advanced ultrasonics were established on NDE ring and rotor standards with EDM notches and drilled holes. Also, intentionally seeded delamination, tow break, and insert of bagging material were introduced in hydroburst-rings to study the NDE detection capabilities of such anomalies and their effect on the damage tolerance and safe life margins of subscale rings and rotors. Examples of possible occurring flaws or anomalies in composite rings as detected by NDE and validated by destructive metallography are shown. The general NDE approach to ensure quality of composite rotors and to help in the certification of flywheels is briefly outlined.
Document ID
Document Type
Preprint (Draft being sent to journal)
Baaklini, George Y. (NASA Glenn Research Center Cleveland, OH United States)
Konno, Kevin E. (NASA Glenn Research Center Cleveland, OH United States)
Martin, Richard E. (Cleveland State Univ. Cleveland, OH United States)
Thompson, Richard (Texas Univ. Austin, TX United States)
Date Acquired
September 7, 2013
Publication Date
October 1, 2000
Subject Category
Space Sciences (General)
Report/Patent Number
NAS 1.15:210473
Meeting Information
Power Systems(San Diego, CA)
Funding Number(s)
PROJECT: RTOP 494-29-11
Distribution Limits
Work of the US Gov. Public Use Permitted.

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