Dynamics behavior and imperfection sensitivity of a fluid-filled multilayered FGM cylindrical structure

Abstract

The paper aims to investigate the transient response of an air-filled multilayer hollow functionally graded (FGM) cylinder with interlaminar bonding imperfection in the presence of load which is extensively put to use in aerospace structure. The material properties of each layer are assumed to vary continuously within the cylinder along the thickness direction with arbitrary grading pattern. A linear spring model is used to define imperfectly bonded interfaces of the multilayer cylinder. The solution of problem is obtained by means of the laminate approximation theory along with the Durbin's numerical Laplace transform inversion with regard to the time coordinate. Detailed numerical study of transient response of multilayer FGM cylinder with imperfect bonding under a pulse excitation are presented. In the following, the effect of imperfection on radial and circumferential stresses is presented and in view of the lack of any data, only the obtained results with the perfect bond are compared to those of other researchers have published in the literature. Also, by displaying contours of the internal pressure field, dynamic features in the fluid-structure interaction are investigated. Finally the effect of load duration and various loads, including step load and exponential load on radial and circumferential stresses are examined in detailed and the results obtained show the effect of step load is more critical than exponential load.