Fail-Safe/Safe-Life Interface Criteria
Final rept. Oct 1973-Oct 1974
TECHNOLOGY INC DAYTON OH
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Preparatory to developing fail-safesafe-life design criteria for future helicopters, extensive literature and Governmentindustry surveys were conducted to define and evaluate the related state of the art. After selected fail-safesafe-life design methodologies were defined, they were applied to the main and tail rotor systems specifically the blade, blade retention device, hub, and rotating controls, the fuselage, and the landing gear. Next, in cost and weight trade-off studies, various combinations of design criteria for redundant structures, controlled-fracture structures, and monolithic structures with slow crack growth were evaluated with respect to their technical feasibility.