NDLI: Foreign object damage of two gas-turbine grade silicon nitrides in a thin disk configuration

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Foreign object damage of two gas-turbine grade silicon nitrides in a thin disk configuration

Content Provider	NASA Technical Reports Server (NTRS)
Author	Bhatt, Ramakrishna T. Janosik, Lesley A. Pereira, J. Michael Choi, Sung R.
Copyright Year	2003
Description	Foreign object damage (FOD) behavior of two commercial gas-turbine grade silicon nitrides, AS800 and SN282, was determined at ambient temperature through post-impact strength testing for thin disks impacted by steel-ball projectiles with a diameter of 1.59 mm in a velocity range from 115 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 IC)). The critical impact velocity in which the corresponding post-impact strength yielded the lowest value was V(sub c) approx. 440 and 300 m/s for AS800 and SN282, respectively. A unique lower-strength regime was typified for both silicon nitrides depending on impact velocity, attributed to significant radial cracking. The damages generated by projectile impact were typically in the forms of ring, radial, and cone cracks with their severity and combination being dependent on impact velocity. Unlike thick (3 mm) flexure bar specimens used in the previous studies, thin (2 mm) disk target specimens exhibited a unique backside radial cracking occurring on the reverse side just beneath the impact sites at and above impact velocity of 160 and 220 m/s for SN282 and AS800, respectively.
File Size	9933267
Page Count	10
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20030111835
Archival Resource Key	ark:/13960/t24b81n6w
Language	English
Publisher Date	2003-01-01
Access Restriction	Open
Subject Keyword	Nonmetallic Materials Impact Strength Ambient Temperature Impact Velocity Silicon Nitrides Cracking Fracturing Impact Tests Impact Damage Foreign Bodies Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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