Abstract
Some dynamical and acoustical properties of sandwich plates are investigated. The types of sandwich elements discussed are three-layered plates with a thick lightweight core, with thin and comparatively stiff laminates bonded to each side of the core. In the model derived it is assumed that the laminates and core are isotropic. The laminates are treated as thin plates, whereas the deflection in the core is described by means of the general field equations. This means that bending shear and rotation, as well as longitudinal deflection, are considered in the core. Wavenumbers, loss factors and apparent bending stiffness for symmetric and asymmetric plates are derived. In addition, the sound transmission loss for sandwich plates is discussed. Measured and predicted results are compared. It is found that bending stiffness and loss factor not only depend on material parameters and plate geometries but also on frequency. The core thickness is very critical for the sound transmission loss of a sandwich plate. Sandwich plates are frequently used in the shipbuilding industry for light and fast passenger vessels. The effects of a fluid load on a sandwich plate is therefore also included.
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