Accession Number:

ADA242017

Title:

Higher-Order Thickness Expansions for Cylindrical Shells

Descriptive Note:

Doctoral thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1991-09-01

Pagination or Media Count:

258.0

Abstract:

Eight variations of higher-order transverse shear deformation HTSD theory were developed for composite shells. Three attributes were varied to produce the eight variations. These attributes include the order of the thickness expansions used to approximate the shell shape factors and the assumed linear displacement field and the nonlinearity of transverse shear strain. Several cylindrical shell problems were investigated using SHELL, a finite- element code with a 36 degree of freedom cylindrical shell element. MACSYMA, a symbolic manipulation code, was used to formulate the element independent stiffness arrays for each variation of the theory. When all nonlinear strain- displacement terms for transverse shear were included for thin shallow isotropic cylindrical shells, the theory predicted a more flexible response during collapse. Higher-order thickness expansions had negligible effect upon results for shallow shell problems investigated. For deeper shells, the linear displacement assumption prohibited the use of nonlinear strain-displacement relations for transverse shear strains. Thus, for deep shells nonlinearity was limited to in-plane strain-displacement relations.

Subject Categories:

  • Construction Equipment, Materials and Supplies

Distribution Statement:

APPROVED FOR PUBLIC RELEASE