Accession Number : AD0643181

Title :   SOME CALCULATIONS ON CREEP IN A PRESSURISED THIN SPHERICAL SHELL WITH AN OPENING.

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE R I DIV OF ENGINEERING

Personal Author(s) : Calladine,C. R.

Report Date : OCT 1966

Pagination or Media Count : 52

Abstract : Calculations were performed on a pressurised thin spherical shell with a sealed opening for material obeying a simple r-power steady creep law; they were done by an iterative procedure on an IBM7090 computer. The results, in terms of stress resultant distributions and deformation patterns in the neighbourhood of the opening for different edge load boundary conditions, were examined critically with a view to detecting simple overall patterns of behaviour which are a function of the creep index r. Examination of the results from two different points of view leads to the conclusions that stress concentration factors vary smoothly and almost linearly with l/r and that deformation patterns are practically independent of r, for the same edge load boundary conditions. The strain rate concentration factors may be very high. The consequences of these conclusions are examined in the context of the design process. (Author)

Descriptors :   (*SHELLS(STRUCTURAL FORMS), CREEP), SPHERES, PRESSURE, STRESSES, DEFORMATION, ORIFICES, MATHEMATICAL ANALYSIS

Subject Categories : Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE