NDLI: Analysis of the national transonic facility mishap

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Analysis of the national transonic facility mishap

Content Provider	NASA Technical Reports Server (NTRS)
Author	Robinson, Martha P. Fasanella, Edwin L.
Copyright Year	1990
Description	The nonlinear dynamic finite element code DYnamic Crash Analysis of STructures (DYCAST) was used to model an accident scenario that occurred at the National Transonic Facility (NTF) wind tunnel. A post mishap investigation revealed that a total of five upstream bulkhead fairing plates were missing, three in one location and two in another. These plates were drawn into the wind tunnel's composite fan blades causing extensive damage. A DYCAST model was developed to determine if one-half of a small thermal shield flange clamp, weighing approximately 2.7 lbs., could have spun off the NTF drive shaft and impacted the bulkhead fairing plates with sufficient energy to cause failure of the attachment bolts. The clamp was presumed to have spun off at a tangent from the NTF drive shaft at a velocity of 1624 in/sec (drive shaft rotating at 580 rpm). The DYCAST analytical model predicts that impact of the 2.7 lbs projectile failed all of the bolts in two of the fairing plates allowing them to escape from the bulkhead ring with a low velocity of a few in/sec.
File Size	555925
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19900008304
Archival Resource Key	ark:/13960/t6wx29511
Language	English
Publisher Date	1990-01-01
Access Restriction	Open
Subject Keyword	Air Transportation And Safety Dynamic Structural Analysis Crashes Wind Tunnels Projectiles Low Speed Fairings Upstream Fan Blades Computer Programs Bulkheads Finite Element Method Failure Analysis Heat Shielding Nonlinearity Mathematical Models Damage 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

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