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Foreign Object Damage in a Gas-Turbine Grade Silicon Nitride by Spherical Projectiles of Various MaterialsAssessments of foreign object damage (FOD) of a commercial, gas-turbine grade, in situ toughened silicon nitride ceramic (AS800, Honeywell Ceramics Components) were made using four different projectile materials at ambient temperature. AS800 flexure target specimens rigidly supported were impacted at their centers in a velocity range from 50 to 450 m/s by spherical projectiles with a diameter of 1.59 mm. Four different projectile materials were used including hardened steel, annealed steel, silicon nitride ceramic, and brass. Post-impact strength of each target specimen impacted was determined as a function of impact velocity to appraise the severity of local impact damage. For a given impact velocity, the degree of strength degradation was greatest for ceramic balls, least for brass balls, and intermediate for annealed and hardened steel balls. For steel balls, hardened projectiles yielded more significant impact damage than annealed counterparts. The most important material parameter affecting FOD was identified as hardness of projectiles. Impact load as a function of impact velocity was quasi-statically estimated based on both impact and static indentation associated data.
Document ID
20060049147
Acquisition Source
Glenn Research Center
Document Type
Technical Memorandum (TM)
Authors
Choi, Sung R.
(Toledo Univ. OH, United States)
Racz, Zsolt
(Ohio Aerospace Inst. Brook Park, OH, United States)
Bhatt, Ramakrishna T.
(NASA Glenn Research Center Cleveland, OH, United States)
Brewer, David N.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
September 1, 2006
Subject Category
Aircraft Propulsion And Power
Report/Patent Number
E-15563
NASA/TM-2006-214330
Funding Number(s)
WBS: WBS 22-714-30-09
Distribution Limits
Public
Copyright
Public Use Permitted.
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