In this work, the free vibration characteristics of flexbeam like structures, typically used in helicopter main or tail rotor blades, are investigated. The tapering effect in these laminated composite structures is introduced by terminating plies, which act as potential delamination sites. Delamination and uncertainties in material properties at various scales influence their dynamic behavior. The variational asymptotic method (VAM) is used as a mathematical framework to develop a model of a tapered composite beam with delamination. Subsequently, the modal characteristics are obtained by coupling the VAM model with the reduced 1D finite element beam model. Stochastic natural frequencies are investigated by combining the source uncertainties in the delaminated structure. Following a detailed validation study, the model capability is demonstrated on flexbeams typically used in helicopter rotor blades.
Stochastic Dynamic Response of Delaminated Flexbeam Like Structures
AIAA Journal ; 1-20
2025-01-01
Article (Journal)
Electronic Resource
English
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