NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Foreign Object Damage in Flexure Bars of Two Gas-Turbine Grade Silicon NitridesForeign object damage (FOD) behavior of two commercial gas-turbine grade silicon nitrides, AS800 and SN282, was determined at ambient temperature through strength testing of flexure test specimens impacted by steel ball projectiles with a diameter of 1.59 mm in a velocity range from 220 to 440 m/s. AS800 silicon nitride exhibited a greater FOD resistance than SN282, primarily due to its greater value of fracture toughness (K(sub lc)). The use of an additional equiaxed, fine-grained silicon nitride (NC132) showed that fracture toughness was a key material parameter affecting FOD resistance. The observed damages generated by projectile impact were typically in the forms of well- or ill-developed ring and cone cracks with little presence of radial cracks.
Document ID
20050040755
Acquisition Source
Glenn Research Center
Document Type
Reprint (Version printed in journal)
Authors
Choi, Sung R.
(Ohio Aerospace Inst.)
Pereira, J. Michael
(NASA Glenn Research Center Cleveland, OH, United States)
Janosik, Lesley A.
(NASA Glenn Research Center Cleveland, OH, United States)
Bhatt, Ramakrishna T.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Materials Science and Engineering A
Publisher: Elsevier
Volume: 379
ISSN: 0921-5093
Subject Category
Structural Mechanics
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available