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Detailed Post-Soft Impact Progressive Damage Assessment for Hybrid Structure Jet EnginesCurrently, certification of engine designs for resistance to bird strike is reliant on physical tests. Predictive modeling of engine structural damage has mostly been limited to evaluation of individual forward section components, such as fan blades within a fixed frame of reference, to direct impact with a bird. Such models must be extended to include interactions among engine components under operating conditions to evaluate the full extent of engine damage. This paper presents the results of a study aim to develop a methodology for evaluating bird strike damage in advanced propulsion systems incorporating hybrid composite/metal structures. The initial degradation and failure of individual fan blades struck by a bird were investigated. Subsequent damage to other fan blades and engine components due to resultant violent fan assembly vibrations and fragmentation was further evaluated. Various modeling parameters for the bird and engine components were investigated to determine guidelines for accurately capturing initial damage and progressive failure of engine components. Then, a novel hybrid structure modeling approach was investigated and incorporated into the crashworthiness methodology. Such a tool is invaluable to the process of design, development, and certification of future advanced propulsion systems.
Document ID
20150000885
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Siddens, Aaron
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Bayandor, Javid
(Virginia Polytechnic Inst. and State Univ. Blacksburg, VA, United States)
Celestina, Mark L.
(NASA Glenn Research Center Cleveland, OH United States)
Date Acquired
January 30, 2015
Publication Date
December 1, 2014
Subject Category
Air Transportation And Safety
Aircraft Propulsion And Power
Statistics And Probability
Report/Patent Number
NASA/TM-2014-218397
GRC-E-DAA-TN17219
E-18974
Funding Number(s)
WBS: WBS 699959.02.25.03.01.01.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
bird strike
turbofan engine
predictive modeling
foreign object impact
propulsion
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