Crew Survivable Helicopter Undercarriage.
Final rept. Jul 82-Oct 83,
VOUGHT CORP DALLAS TX
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The program goal was to demonstrate the energy absorbing capability of the Vought rotated sine wave concept for helicopter fuselage under-carriage structure. Specific program objectives were to develop design and manufacturing procedures for energy absorbing aluminum structure, fabricate and test specimens to confirm the methods and relate the slow and high rate test results to undercarriage structure designed to meet MIL-STD-1290 criteria. The specimens were fabricated in a standard sheet metal shop, without special attention. There are several cost and weight advantages associated with the sine wave concept. The cost savings relative to conventional metal design are attributable to the reduction in number of parts and fasteners which saves material dollars and assembly hours. The high-rate and slow-rate testing of the test elements verified the performance of the energy absorbing structure developed in this program. The selected skin gage to meet the 200 lbsin. running load requirement is 0.063 inch. The substructure will carry normal load requirement is 0.063 inch. The substructure will carry normal flight loads and provide the energy absorbing capability when necessary. Author
- Metallurgy and Metallography
- Test Facilities, Equipment and Methods