DYNAMIC BEHAVIOUR OF THE COMPOSITE DELAMINATED SHIP DECK PLATES
Abstract
The work presented in this paper analyzes the influence of the material damping properties of the composite plates with delaminations. The linear elastic behaviour of the laminate plates can be predicted from the properties of the individual plies using laminate theory that can also be used to predict the damping properties of such plates. An orthotropic delamination model, describing delaminating mode, using COSMOS/M soft package, is presented in this paper for analyzing the behaviour of the delaminated composite plates during vibrations. So, the damaged part of the structures and the undamaged part have been represented by wellknown finite elements (layered shell elements). The influence of the position and the ellipse’s diameters ratio of delaminated zone on the dynamic behaviour of the composite plate is investigated. The plates are made of E-glass polyester, having the dimensions: 320 mm x 320 mm and a thickness of 9.82 mm. The experiments for determining the damping coefficients and the first three natural frequencies for all plates were made with an experimental rig, presented in the paper.
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