FEA-simulation to optimize laminated composite plate with cutout in free vibrations
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Date
2021-02
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
In the present work, modelling and modal analysis is performed for laminated composite plates. A square plate of 1 meter edge length is studied. There are four boundary conditions considered, which are SSCC, SSCS, SSSS and SSCF. There are four types of standard lay which are considered, Symmetric Ply, Quasi Isotropic Ply, Cross Ply and Angle Ply. The study is performed in three parts as experiments. In the first part the plates are studied for modes which are significant in deformation in the z axis. It is found that 88% of the total modes considered have a very low contribution. The SSCF boundary condition has maximum modes which have higher contribution. In the second part plate with opening is studied. The opening types taken as circular, hexagonal, rectangular and square are studied. It is seen that circular opening is most suitable and square opening is least suitable among these shapes. Large variation occur for the boundary conditions SSCS, SSSS and SSCF and so they must be used after carrying out proper analysis on the basis of application. In the third part direct optimization is carried out for 1st mode frequency as objective function. Elliptical opening with different ratio for major and minor axis length and major axis orientation angle with the reference axis have been taken as parameter for optimization. It is observed that the length ratio of minor to major axis is higher for maximization case than that of minimization case. The orientation angle comes close to 90˚ for SSCF boundary condition. The study is done on the finite element analysis software ANSYS.