NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Effect of Projectile Materials on Foreign Object Damage of a Gas-Turbine Grade Silicon NitrideForeign object damage (FOD) behavior of AS800 silicon nitride was determined using four different projectile materials at ambient temperature. The target test specimens rigidly supported were impacted at their centers by spherical projectiles with a diameter of 1.59 mm. Four different types of projectiles were used including hardened steel balls, annealed steel balls, silicon nitride balls, and brass balls. Post-impact strength of each target specimen impacted was determined as a function of impact velocity to better understand the severity of local impact damage. The critical impact velocity where target specimens fail upon impact was highest with brass balls, lowest with ceramic ball, and intermediate with annealed and hardened steel balls. Degree of strength degradation upon impact followed the same order as in the critical impact velocity with respect to projectile materials. 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 and was correlated in terms of critical impact velocity, impact deformation, and impact load.
Document ID
20060019250
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Choi, Sung R.
(NASA Glenn Research Center Cleveland, OH, United States)
Racz, Zsolt
(NASA Glenn Research Center Cleveland, 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)
Gyekenyesi, John P.
(NASA Glenn Research Center Cleveland, OH, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2005
Subject Category
Mechanical Engineering
Report/Patent Number
GT2005-68866
Meeting Information
Meeting: ASME Turbo Expo 2005: Power for Land, Sea, and Air
Location: Reno, NV
Country: United States
Start Date: June 6, 2005
End Date: June 9, 2005
Sponsors: American Society of Mechanical Engineers
Funding Number(s)
OTHER: 22-714-30-09
Distribution Limits
Public
Copyright
Other

Available Downloads

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