
Accession Number : AD0699532
Title : FREE VIBRATIONS OF CIRCULAR CYLINDRICAL WEBSTIFFENED SANDWICH SHELLS.
Descriptive Note : Research rept.,
Corporate Author : POLYTECHNIC INST OF BROOKLYN N Y DEPT OF AEROSPACE ENGINEERING AND APPLIED MECHANICS
Personal Author(s) : Ranlet,David ; Chen,YoulNan ; Kempner,Joseph
Report Date : JAN 1970
Pagination or Media Count : 100
Abstract : An analysis is presented of the free vibrations of simplysupported and clamped, webstiffened, circular, cylindrical sandwich shells. The mathematical model formulated includes the effect of translatory and rotatory inertia in each layer of the sandwich, and treats the two face layers as thin shells in which the classical (Donnell) theory of shells applies. Shear deformations, however, are permitted in the core, which is treated as a layer of inhomogeneous, orthotropic material. In the analysis, the discrete nature of the webs is maintained, except for the inclusion of an average secondary shear modulus induced by the bending of the webs and faces. Equations are also developed for the free vibrations of the corresponding homogeneously cored sandwich shells, in order to investigate the effect of smearingout or averaging a given webstiffened core. A Galerkin procedure is employed to determine the natural frequencies from a variational functional generated by means of Hamilton's principle. (Author)
Descriptors : (*UNDERWATER VEHICLES, STIFFENED CYLINDERS), (*SANDWICH CONSTRUCTION, VIBRATION), SHEAR STRESSES, RESONANT FREQUENCY, STRAIN(MECHANICS), DEFORMATION, MATHEMATICAL ANALYSIS, THEORY
Subject Categories : Marine Engineering
Mechanics
Distribution Statement : APPROVED FOR PUBLIC RELEASE