Dynamic response of fluid-loaded composite plates to stationary and moving loads.

摘要

Laminated composite plates are important elements in different structural applications due to their high strength to weight ratio. They are exposed to several types of loading such as fluid loading. This type of loading can be widely found in nuclear reactors and marine structures. Other type of loading is the one in which the load is moving. The moving load might be a conventional vehicle, a loading airplane, or a train. Studying the combined effects of the two types of loading is of great importance in order to find critical values of load velocity leading to significant vibrations, which subsequently lead to some annoying or maybe failure problems. In the present work, Liquid-loaded laminated composite plates are investigated under stationary and moving loads. Dispersion curves are calculated under different liquid loading conditions. Transient normal displacements are computed for 3, 6, and 12 ply laminated plates at three different locations along three main directions, namely, 0°, 45° and 90° direction. In addition, Group velocities are compared along these directions. For comparison purposes, the response is simulated for an isotropic plate at three different locations. Effect of liquid loading on these responses and group velocities is studied. For a single moving load, critical velocities of the load are computed for isotropic and laminated plates under different conditions. For double moving loads, effects of phase difference between loads and velocity of the loads on the maximum displacement of both isotropic and laminated plates are investigated. A higher order approximate solution in conjunction with Fourier transforms technique is used to model the dynamic behavior of the plate. This solution is based on the plate bending theory, which includes the effects of transverse shear and rotary inertia.