Abstract
This article investigates the free vibration and damping characteristics of carbon fiber-reinforced sandwich cylindrical shells with 3D reentrant auxetic cores (3D RSCSs). Finite element analysis based on the modal strain energy method is utilized for simulated predictions, while a theoretical model based on the Rayleigh-Ritz method and third-order shear deformation theory (TOSDT) is used for theoretical predictions. Through a combination of hot press molding and interlocking assembly, all-composite 3D RSCSs specimens are manufactured. The modal characteristics of 3D RSCSs are obtained by hammer excitation modal tests. The prediction for modal properties shows good agreement with the experimental tests. Furthermore, the influences of fiber ply angles and geometric parameters on the natural frequency and damping loss factor are thoroughly investigated, which could be helpful to guide vibration analysis of lightweight metamaterials cylindrical shells with negative Poisson’s ratio and promote its engineering application in vibration reduction.
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