Using piezoelectric ring stiffeners to alleviate deformations due to high temperature on shell-type structures

摘要

A methodology conceived to alleviate the deformation of cylindrical shells has been developed. ^The basic idea is to use piezoelectric ring stiffeners bonded to the surface of the shell to counteract the deformation caused by external loading, such as deformations caused by gravity, by internal pressure, and by temperature increase. ^The function of the piezoelectric ring stiffeners is realized not only through their own strength, but more importantly through their electric-induced strain, and therewithal the induced pressure on the surface of the shell, which may produce an adjustable deformation in opposite direction of the deformations caused by external loading. ^A set of conventional linear partial differential equations defining deformations of a cylindrical shell is accepted. ^The method of superposition is used to obtain a global solution. ^A thin-walled cylindrical shell is designed for computer simulation. ^Assume that the external casting of a thin-walled shell is rigid, and the internal shell with a number of piezoelectric ring stiffeners is simply supported at its two ends to the rigid external casting. ^Eighteen piezoelectric ring stiffeners are disposed along the length of the shell, and perfectly bonded at its outer surface. ^The deformations along two generatrices of the shell are computed to demonstrate the effect of alleviation. ^(Author)