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The variation of modal responses due to the change in shapes (square/rectangular) and sizes of the cutout impregnated composite panels (Glass/Epoxy) are predicted numerically using higher-order finite element formulation. The degree of accuracy of the proposed model is verified by comparing the modal values with the experimentally recorded data for the validation purpose, including the experimental composite properties. The isoparametric finite element formulation is adopted to model the layered panel configuration in association with the higher-order polynomial kinematic model. The modeling of the cutout is achieved through the equations of one-quarter of the plate and extended further to join for all four quarters. The model generosity is checked through analyzing the frequencies for variable geometrical shapes (plate, cylindrical, spherical, hyperboloid and elliptical), material properties and boundary conditions. Also, the results are verified for the variable cutout shapes (square and rectangular) and the sizes by comparing the results with published numerical modal values. This is the maiden experimental verification to show the inevitability of higher-order numerical model for the computation of eigenvalues of the laminated composite components with cutout. Lastly, the conclusions are deliberating the effect either individual or the combined design-dependent structural parameters (aspect ratios, thickness ratios, curvature ratios and different end boundary constraints including the sizes of cutout) by solving different examples. [ABSTRACT FROM AUTHOR]

The effect of cut-out parameters (shapes: square and circular; position: concentric/eccentric) on the dynamic deflection values of the curved/flat layered composite panel are verified experimentally with the higher-order finite element solutions first-time. The solutions are obtained using the linear finite element model in the framework of cubic-order displacement filed functions. The necessity of higher-order kinematic model is verified by comparing the experimental transient data by conducting the different test to show the accuracy of the finite element solution. Moreover, the theoretical finite element solutions are obtained using the own experimental elastic property data for the comparison (numerical and experimental) purpose. Finally, the critical behaviour of the proposed numerical model for the dynamic analysis of damaged composite structure is examined by solving different types of example by varying the design constraint parameter including the cut-out factors (shape, size, location and eccentricity). The inclusiveness of each parameter on the time-dependent deflections is expressed in details from the various example including the comparison. [ABSTRACT FROM AUTHOR]