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Metal/Composite Hybrid Rotor Blade Spar Construction
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English
Abstract
Unidirectional fiberglass straps are investigated as a means of providing metal rotor blades with a redundant load path and reduced fatigue crack growth rate. A comparison of crack growth rates for a metal/composite hybrid spar and a conventional metal blade structure are shown. Comparisons of ballistic impact damage for the hybrid spar and the metal spar are presented. Additionally, the results of small-specimen fatigue tests to investigate void propagation at the glass/metal interface are discussed.
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Citation
Reyes, P. and Glass, M., "Metal/Composite Hybrid Rotor Blade Spar Construction," SAE Technical Paper 751107, 1975, https://doi.org/10.4271/751107.Also In
References
- Jones R. M. “Mechanics of Composite Materials.” Washington, D. C. Scripta Book Company (McGraw-Hill) 1975 23
- Greszczuk L. B. ‘Stress Concentrations and Failure Criteria for Orthotropic and Anisotropic Plates With Circular Openings,’ “Composite Materials: Testing and Design (Second Conference),” American Society for Testing and Materials 1972 363 381
- Field D. Finney R. Stratton W. “Achieving Fail-Safe Design in Rotors.” Paper 673 28th Annual National Forum of the American Helicopter Society Washington, D.C. May 1972