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National Advisory Committee for Aeronautics, Technical Notes - Tables of Coefficients for the Analysis of Stresses About Cutouts in Circular Semimonocoque Cylinders with Flexible Rings

Tables of coefficients are presented which facilitate the stress
analysis of circular semimonocoque cylinders with cutouts by the method
published in NACA TN 5200. When the values of two simple structural
parameters are known, use of these coefficients enables shear flows and
stringer loads in the neighborhood of a cutout to be calculated. The
effect of bending flexibility of the rings in their planes has been taken
into consideration in the computation of the coefficients. Included as
a limiting case are the tables from NACA TN 5200 which were computed on
the assumption that there is no distortion of the rings in their planes.

A method of stress analysis for the calculation of shear flows and
stringer loads in the neighborhood of cutouts in circular semimonocoque
cylinders is presented in reference 1. In this method of analysis it is
assumed that the stress distribution in the cylinder without a cutout is
known. The method involves the superposition of stress distributions due
to certain perturbation loads on the structure without a'cutout in such
a way as to produce the effect of a cutout. The purpose of this report
is to present tables of coefficients which facilitate the computations
involved in applying the method of analysis (ref. 1). The coefficients
represent the stress distribution (shear flows and stringer loads) in
a circular semimonocoque cylinder which has no cutout and is loaded by
each of three unit perturbation loads. The coefficients were calculated
from formulas derived in reference 2, in which the effect of ring flex—
ibility was taken into account. The calculations were performed on an
IBM Card—Programmed Electronic Calculator at the Langley Aeronautical
Laboratory. The use of the tables in conjunction with the method pre—
sented in reference 1 enables the stress analyst-to compute stringer
loads and shear flows in the neighborhood of a cutout in a circular _
semimonocoque cylinder.