Abstract
The present paper deals with the experimental and finite element studies carried out on free vibration of isotropic and laminated composite skew plates. The natural frequencies were determined using CQUAD8 finite element of MSC/NASTRAN and comparison made between the experimental values and the finite element solution. The effects of the skew angle and aspect ratio on the natural frequencies of isotropic skew plates were studied. The effects of skew angle, aspect ratio, fiber orientation angle and laminate stacking sequence (keeping total number of layers in the laminate constant) on the natural frequencies of antisymmetric laminated composite skew plates were also studied. The experimental values of the natural frequencies are in good agreement with the finite element solution. The natural frequencies generally increase with an increase in the skew angle for any given value of aspect ratio.
Highlights
The skew plates have wide application in civil, marine, aeronautical and mechanical engineering, some of them being wings of aeroplanes, skew bridges, ship hulls and parallelogram slabs in buildings
It is seen that the first natural frequency decreases with an increase in the aspect ratio for all laminate stacking sequences
The first, second and third natural frequencies generally increase with an increase in the skew angle for any given value of aspect ratio for all the laminate stacking sequences
Summary
The skew plates have wide application in civil, marine, aeronautical and mechanical engineering, some of them being wings of aeroplanes, skew bridges, ship hulls and parallelogram slabs in buildings. The exact solutions to free vibration problems of skew plates are mathematically involved and in many complicated cases not available. Most of the available solutions are based on approximate methods, the most commonly used method being the finite element analysis
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