Accession Number : ADA307357

Title :   Impact Resistance of Composite Fan Blades.

Descriptive Note : Contractor rept.,

Corporate Author : PRATT AND WHITNEY AIRCRAFT GROUP EAST HARTFORD CT

Personal Author(s) : Premont, E. J. ; Stubenrauch, K. R.

PDF Url : ADA307357

Report Date : MAY 1973

Pagination or Media Count : 82

Abstract : The resistance of current-design Pratt & Whitney Aircraft low aspect ratio advanced fiber reinforced epoxy matrix composite fan blades to foreign object damage (FOD) at STOL operating conditions was investigated. Five graphite/epoxy and five boron/epoxy wide chord fan blades with nickel plated stainless steel leading edge sheath protection were fabricated and impact tested. The fan blades were individually tested in a vacuum whirlpit under FOD environments. The FOD environments were typical of those encountered in service operations. The impact objects were ice balls, gravel, starlings and gelatin simulated birds. Results of the damage sustained from each FOD impact are presented for both the graphite and boron reinforced blades. Tests showed that the present design composite fan blades, with wrap around leading edge protection have inadequate FOD impact resistance at 244 m/sec (800 ft/sec) tip speed, a possible STOL operating condition.

Descriptors :   *FAN BLADES, *IMPACT STRENGTH, *FOREIGN OBJECT DAMAGE, *GRAPHITE EPOXY COMPOSITES, *SHORT TAKEOFF AIRCRAFT, LAMINATES, IMPACT TESTS, FIBER REINFORCED COMPOSITES, FABRICATION, COMPOSITE STRUCTURES, GRAPHITE, GRAVEL, AIRFOILS, ICE, HIGH STRENGTH, BIRD STRIKES, LEADING EDGES, QUALITY ASSURANCE, PREPREGS, BORON, GELATINS.

Subject Categories : V/STOL
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE