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Metallographic Analysis of Brush Bristle and Integrity Testing of Brush Seal in Shroud Ring of T-700 EnginePost-test investigation of a T-700 engine brush seal found regions void of bristles ('yanked out'), regions of bent-over bristles near the inlet, some 'snapped' bristles near the fence, and a more uniform 'smeared' bristle interface between the first and last axial rows of bristles. Several bristles were cut from the brush seal, wax mounted, polished, and analyzed. Metallographic analysis of the bristles near the rub tip showed tungsten-rich phases uniformly distributed throughout the bristle with no apparent change within 1 to 2 micron of the interface except for possibly a small amount of titanium, which would represent a transfer from the rotor. Analysis of the bristle wear face showed nonuniform tungsten, which is indicative of material resolidification. The cut end contained oxides and internal fractures; the worn end was covered with oxide scale. Material losses due to wear and elastoplastic deformation within the shear zone and third-body lubrication effects in the contact zone are discussed.
Document ID
19960021100
Acquisition Source
Headquarters
Document Type
Technical Memorandum (TM)
Authors
Hendricks, Robert C. (NASA Lewis Research Center Cleveland,OH United States)
Griffin, Thomas A. (Army Research Lab. Cleveland, OH United States)
Bobula, George A. (Army Research Lab. Adelphi,MD United States)
Bill, Robert C. (Army Research Lab. Cleveland, OH United States)
Hull, David R. (NASA Lewis Research Center Cleveland,OH United States)
Csavina, Kristine R. (Sverdrup Technology, Inc. Brook Park, OH United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1995
Subject Category
Spacecraft Propulsion And Power
Report/Patent Number
NAS 1.15:106361
E-8155
ARL-MR-119
NASA-TM-106361
Meeting Information
Meeting: International Symposium on Transport Phenomena and Dynamics of Rotating Machinery
Location: Kaanapali, Maui, HI
Country: United States
Start Date: May 8, 1994
End Date: May 11, 1994
Sponsors: Pacific Center of Thermal Fluids Engineering
Accession Number
96N24575
Funding Number(s)
PROJECT: RTOP 584-03-11
CONTRACT_GRANT: NAS3-25266
PROJECT: DA Proj. 1L162211A47A
Distribution Limits
Public
Copyright
Public Use Permitted.

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