National Advisory Committee for Aeronautics (NACA) - 420 Matching Results

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Table of interplanar spacings for crystal-structure determinations by X-ray diffraction with molybdenum, copper, cobalt, iron, and chromium radiations

Description: For a simple diffraction pattern, the time required to calculate interplanar distances from measurements of the pattern is not excessive. If more than a few lines are present, however, or if several patterns are to be studied, it is very advantageous to have available a table giving interplanar spacings directly in terms of the linear measurements made on the film of the lines appearing on the diffraction pattern. The preparation of the table given here was undertaken when the expansion of research activities involving X-ray diffraction techniques indicated that such a table would greatly decrease the time required to analyze diffraction patterns. The table was prepared for use with K alpha(sub 1) radiation from the following target materials: molybdenum, copper, cobalt, iron, and chromium.
Date: October 1, 1945
Creator: Kittel, J Howard
Partner: UNT Libraries Government Documents Department

Analytical study of transmission of load from skin to stiffeners and rings of pressurized cabin structure

Description: From Introduction: "The investigations in this paper were made to obtain more generalized mathematical analyses of monocoque structure subjected to internal pressure. It is also assumed that the principle of superposition can be applied, so that stress analysis of a structure with combined internal pressure and external load can be made without excessive complication."
Date: October 1945
Creator: Pian, Theodore Hsueh-Huang
Partner: UNT Libraries Government Documents Department

Survey of adhesives and adhesion

Description: Report presenting an investigation regarding the strengths of bonds between different chemical types of adhesives and adherends. Some of the topics explored include the theoretical aspects of adhesion and properties of adhesively bonded structures.
Date: August 1945
Creator: Rinker, R. C. & Kline, G. M.
Partner: UNT Libraries Government Documents Department

Axial fatigue test at two stress amplitudes of 0.032-inch 24S-T sheet specimens with a circular hole

Description: Report presenting testing of the effect of applying a number of cycles of a high fatigue stress followed by a number of cycles of relatively low stress to failure has been investigated on 93 drilled specimens of a 24S-T sheet. The results indicated that any general formula for endurance must take sequence into consideration, which makes overly simple formulas inadequate to describe endurance over varying stress amplitudes.
Date: July 1945
Creator: Brueggeman, W. C.; Mayer, M., Jr. & Smith, W. H.
Partner: UNT Libraries Government Documents Department