Analysis of smart functionally graded structures integrated with piezoelectric composites

Abstract

newline This thesis is devoted to the nonlinear bending and vibrations of smart functionally newlinegraded structures. First, the nonlinear static analysis for smart functionally graded beams newlineintegrated with a layer of piezoelectric composite (PZC) material has been carried out. In newlinethis work, Active Fiber Composite (AFC) is used as the piezoelectric composite material newlinewhich is commercially available. The performance of AFC as distributed actuator on newlinecontrol of nonlinear bending deformation of the functionally graded (FG) beams has also newlinebeen studied. The FG beams are also analyzed for high temperature environment newlineconsidering the temperature dependent material properties. Next, Active damping newlinecharacteristics for nonlinear vibrations of smart functionally graded beams under active newlineconstrained layer damping (ACLD) treatment has been analyzed. In ACLD treatment, AFC newlinematerial is used as the material of the constraining layer and the constrained viscoelastic newlinelayer of these ACLD patches are modeled using Golla-Hughes-McTavish (GHM) method newlinewhich is a time domain approach. First order shear deformation theory (FSDT) is used for newlineeach individual layer of the smart FG beams. The analysis reveals that the ACLD treatment newlinewith AFC constraining layer significantly controls the geometrically nonlinear vibrations of newlinethe functionally graded beams. Further investigations are carried out on functionally graded newlineplates combined with AFC patches as distributed actuator in various configurations to newlineevaluate the performance of AFC material for large deflection control of FG plates. Next, newlinethe performance of AFC material as constraining layer of the ACLD treatment for newlinecontrolling geometrically nonlinear vibrations of the FG plates has also been studied. newlineCutouts are inevitable in structures and their presence results in the change of static newlineas well as dynamic characteristics of structures. Therefore, analysis of nonlinear deflection newlineand vibrations of FG plates in presence of cutouts and combined with AFC material is newlinecarried out. The material properties for FG structures considered here are based on simple newlinepower law along the thickness direction. In all the above purposes, Finite Element (FE) newlinesolid models are created for the smart FG beams, plates and plates with cutout. Simulation newlinemodels are developed for the FG beams and plates studied here in the commercially newlineavailable ANSYS software. Validation of results of the proposed mathematical models newlinedeveloped by FE method is done using the results obtained in the ANSYS environment. newlinevi newlineEmphasis