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Balakrishnan, B.
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article
Vibroacoustic Performance of Fiber Metal Laminates with Delamination
Abstract
In the present work, the numerical assesment of vibroacoustic (VA) performance of Fibre Metal Laminates (FML) with mid-plane center delamination is presented. A fluid structure interaction study has been done using Finite Element Method (FEM). Experimental validation is performed on aluminium panel for verifying the correctness of Finite Element idealization procedure to simulate the fluid-structure interaction. Delamination is introduced in the FE model of FML panel and VA analysis is subsequently carried out. Sound Transmission Loss (STL) is computed on the panel with center delamination and without delamination. The Over All Sound Pressure Level (OASPL) shows that the presence of delamination (40% in total area) in FML has not changed the total energy of the transmitted sound, when compared to aluminium and composites. However, in the narrow frequency bands (150-200 Hz, 200-250 Hz) the sound transmission nature has been significantly affected due to local delamination modes, participating in the fluid-structure interaction process.