Accession Number : AD0699532

Title :   FREE VIBRATIONS OF CIRCULAR CYLINDRICAL WEB-STIFFENED 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,Youl-Nan ; Kempner,Joseph

Report Date : JAN 1970

Pagination or Media Count : 100

Abstract : An analysis is presented of the free vibrations of simply-supported and clamped, web-stiffened, 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 smearing-out or averaging a given web-stiffened 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