Fiber Composite Fan Blade Impact Improvement Program.
GENERAL ELECTRIC CO CINCINNATI OH
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This report describes the results of a 20-month program, beginning in June 1974, designed to investigate parameters which effect the foreign object damage resulting from ingestion of birds into fan blades of a QOSEE-type engine. Work performed on this program included the design, fabrication, and impact testing of QOSEE fan blades to demonstrate improvement in FOD resistance relative to existing blades and also the design and demonstration of a pin root attachment concept. In the first phase of the program, it was found that, in general, for the small objects used, the strains in the blade are proportional to the mass of the impacting object and the square of the relative velocity component normal to the blade chord at the impact location. These parameters can be further combined into an average or nominal force normal to the blade at the impact location. A finite element computer program gave results that compare well with the test data. In the second phase of the program four improved blades exhibited substantial improvement in FOD resistance relative to former designs.
- Jet and Gas Turbine Engines