NDLI: Impact resistance of fiber composite blades used in aircraft turbine engines

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Impact resistance of fiber composite blades used in aircraft turbine engines

Content Provider	NASA Technical Reports Server (NTRS)
Author	Friedrich, L. A. Preston Jr., J. L.
Copyright Year	1973
Description	Resistance of advanced fiber reinforced epoxy matrix composite materials to ballistic impact was investigated as a function of impacting projectile characteristics, and composite material properties. Ballistic impact damage due to normal impacts, was classified as transverse (stress wave delamination and splitting), penetrative, or structural (gross failure). Steel projectiles were found to be gelatin ice projectiles in causing penetrative damage leading to reduced tensile strength. Gelatin and ice projectiles caused either transverse or structural damage, depending upon projectile mass and velocity. Improved composite transverse tensile strength, use of dispersed ply lay-ups, and inclusion of PRD-49-1 or S-glass fibers correlated with improved resistance of composite materials to transverse damage. In non-normal impacts against simulated blade shapes, the normal velocity component of the impact was used to correlate damage results with normal impact results. Stiffening the leading edge of simulated blade specimens led to reduced ballistic damage, while addition of a metallic leading edge provided nearly complete protection against 0.64 cm diameter steel, and 1.27 cm diameter ice and gelatin projectiles, and partial protection against 2.54 cm diameter projectiles of ice and gelatin.
File Size	17645818
Page Count	151
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19740002613
Archival Resource Key	ark:/13960/t1ng9dq12
Language	English
Publisher Date	1973-05-01
Access Restriction	Open
Subject Keyword	Propulsion Systems Terminal Ballistics Composite Materials Turbine Blades Reinforcing Fibers Impact Resistance Ice Aircraft Engines Gelatins Steels Impact 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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