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http://dx.doi.org/10.20910/JASE.2020.14.S.22

Fatigue Life Evaluation of Fiber Reinforced Composite Rotor Blades Considering Impact Damages  

Kee, Young-Jung (Korea Aerospace Research Institute, Aeronautics Research Directorate)
Park, Jae-Hun (Korea Aerospace Research Institute, Aeronautics Research Directorate)
Kim, Sung-Man (Korea Aerospace Industries, LTD., LAH Program Division)
Kim, Gi-Hun (Korea Testing Laboratory, Aviation Technology Center)
Publication Information
Journal of Aerospace System Engineering / v.14, no.spc, 2020 , pp. 22-30 More about this Journal
Abstract
Composite rotor blades for rotorcraft have an intrinsic vulnerability to foreign object impact from its inherent structural characteristics of insufficient strength in the thickness direction, which may easily lead to internal structure damage. Therefore, defects and strength reducing effects caused by foreign object impact should be considered in fatigue evaluation of composite blades. For this purpose, the flaw tolerant safe-life and fail-safe concepts were adopted in fatigue evaluation since 1980s, and recently those concepts have been replaced by the damage tolerance concept. In this paper, the relevant standards for fatigue evaluation are analyzed focusing on fiber reinforced composite rotor blades used in rotorcraft. In addition, fatigue evaluation procedure of composite blades considering impact damages is proposed by reviewing the practices implemented through domestic development projects.
Keywords
Fatigue Evaluation; Damage Tolerance; Composite Blade; Safe Life; Inspection Interval;
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