Benchmark solution
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Calculation method
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It is a reference test in the literature to validate the modal analysis of a stratified plate. The literature provides reference results based on experimental data and the results of other codes such as Nastran3D.


Reference quantities and results
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The natural frequency solution obtained by code_aster is compared in the case where there is no delamination.


Uncertainties about the solution
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In the case where the delamination of the layers does not take place, the reference results vary between [:ref:`79,2; 82,1  <79,2; 82,1 >`] Hz. So we want to obtain the first natural frequency in this range.


Bibliographical references
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1. Jinho Oh a, Maenghyo Cho, Jun-Sik, Kim G., "Dynamic analysis of composite plate with multiple delaminations based on higher-order zigzag theory", International Journal of Solids and Structures 42 (2005) 6122—6140.