Executive Summary : | surface Acoustic Wave (sAW) devices, such as sensors, filters, transducers, actuators, etc., are widely used in the fields of earthquake engineering, aerospace engineering, acoustic engineering, and many smart manufacturing industries. These functional devices are made of piezoelectric, functionally graded, etc. materials. Hence, the investigations/studies over the wave interaction problems into the functionally graded piezoelectric (FGP) composites have become a topic of practical importance. It has also attracted many researchers for the purpose of design and optimization of PPC transducers. However FGP materials have unique and promising features, but it has been found that the queasy nature of these materials may be responsible for cracks impurities, cavities, and hence device failure under electrical thermal and mechanical loads. Therefore, in order to develop high-performance sensor devices, a comprehensive analysis of wave interaction through FGP composites should be performed. In this view, I am proposing this research idea to develop some mathematical models of aforesaid devices comprising of functionally graded piezoelectric material (FGPM) composites. The considered mathematical models/problems are divided in parts based on materialistic and structural layouts. The assumption of perfect interfaces (wielded contacts) between the adjacent media are perfectly bonded may not always be true, it may be imperfect due to various environmental factors and thermal/mechanical loadings. In the design and application of FGP sensors, it is a necessity to consider a potentially imperfect interface. Therefore, it has been become important to study the surface wave propagations at the imperfect interface between adjacent layers of functionally graded piezoelectric (FGP) composites. Rayleigh surface waves are widely used in various electronic devices at high ultrasonic frequencies, while Love-type waves propagating in piezoelectric materials are widely used in transducers and sensors. The first two problems of this project will give a detailed analysis over the Love-type and Rayleigh surface wave interactions into a functionally graded piezoelectric (FGP) composite having imperfect/sliding/spring interfaces into the structure. The last problem will investigate over the moving load problem of floating FGM sheets on water. The study of the moving load provides an understanding of the stresses produced in a solid medium. Furthermore, the proposed work will analyze the characteristics of wave propagation FGP composites with some physical circumstances and its dependence on various physical parameters. The results of the proposed study will be important because of their theoretical and practical implications for the several fields of science and engineering. |