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Foreign object damage in a gas-turbine grade silicon nitride by spherical projectiles of various materials
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Bhatt, Ramakrishna T. Racz, Zsolt Brewer, David N. Choi, Sung R. |
| Copyright Year | 2006 |
| Description | Assessments 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. |
| File Size | 3821272 |
| Page Count | 35 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20060049147 |
| Archival Resource Key | ark:/13960/t0wq4xx6s |
| Language | English |
| Publisher Date | 2006-09-01 |
| Access Restriction | Open |
| Subject Keyword | Aircraft Propulsion And Power Degradation Damage Assessment Projectiles Estimating Impact Velocity Silicon Nitrides Ceramics Hardness Impact Loads 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 | Technical Report |
