UNT Libraries Government Documents Department - 40 Matching Results

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Beam and torsion tests of aluminum-alloy 615-T tubing

Description: From Summary: "Tests were made to determine the effect of length and the effect of ratios of diameter to wall thickness upon the flexural and torsional moduli of failure of 61S-T aluminum-alloy tubing. The moduli of failure in bending, as determined by tests in which the tubing was loaded on the neutral axis at the one-third points of the span, were found to bear an approximately linear relationship with diameter-thickness ratio and were practically independent of span within the limits investi… more
Date: October 1942
Creator: Moore, R. L. & Holt, Marshall
Item Type: Refine your search to only Report
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Bending of Rectangular Plates with Large Deflections

Description: "The solution of von Karman's fundamental equations for large deflections of plates is presented for the case of a simply supported rectangular plate under combined edge compression and lateral loading. Numerical solutions are given for square plates and for rectangular plates with a width-span ratio of 3:1. The effective widths under edge compression are compared with effective widths according to von Karman, Bengston, Marguerre, and Cox and with experimental results by Ramberg, McPherson, and… more
Date: May 1942
Creator: Levy, Samuel
Item Type: Refine your search to only Report
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Bending tests of a monocoque box

Description: A monocoque box beam consisting of a 24S-T aluminum-alloy sheet reinforced by four bulkheads and by longitudinal stringers and corner posts was subjected to bending loads as follows: pure bending about the lift axis, cantilever bending about the lift axis, and pure bending about both lift and drag axis. Longitudinal strains were measured for loads up to a load at which permanent set became measurable. The loads were sufficient to produce buckling of the sheet between stringers on the compressio… more
Date: November 1942
Creator: McPherson, Albert E.; Ramberg, Walter & Levy, Samuel
Item Type: Refine your search to only Report
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Bending With Large Deflection of a Clamped Rectangular Plate With Length-Width Ratio of 1.5 Under Normal Pressure

Description: "The Von Karman equations for a thin flat plate with large deflections are solved for the special case of a plate with clamped edges having a ratio of length to width of 1.5 and loaded by uniform normal pressure. Center deflections, membrane stresses, and extreme-fiber bending stresses are given as a function of pressure for center deflections up to twice the thickness of the plate. For small deflections the results coincide with those obtained by Hencky from the linear theory" (p. 1).
Date: July 1942
Creator: Levy, Samuel & Greenman, Samuel
Item Type: Refine your search to only Report
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A comparison of the results from general tank tests of 1/6- and 1/12-full-size models of the British Singapore IIC flying boat

Description: From Summary: "A 1/6-full-size model of the hull of the British Singapore IIC flying boat was tested in the NACA tank. The results are given in the form of charts and are compared with the results of previous tests made in the NACA tank of a 1/12-full-size model, published in NACA T.N. No. 580, and with the results of tests made in the British R.A.E. tank of another 1/6-full-size model of the same hull. When the data from the tests of the 1/6- and 1/12-full-size models were compared on the basi… more
Date: August 1942
Creator: Truscott, Starr & Dawson, John R.
Item Type: Refine your search to only Report
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The critical compression load for a universal testing machine when the specimen is loaded through knife edges

Description: "The results of a theoretical and experimental investigation to determine the critical compression load for a universal testing machine are presented for specimens loaded through knife edges. The critical load for the testing machine is the load at which one of the loading heads becomes laterally instable in relation to the other. For very short specimens the critical load was found to be less than the rated capacity given by the manufacturer for the machine. A load-length diagram is proposed f… more
Date: September 1942
Creator: Lundquist, Eugene E. & Schwartz, Edward B.
Item Type: Refine your search to only Report
open access

Curing of Resin-Wood Combinations by High-Frequency Heating

Description: Note presenting a summary of the results of an investigation of the curing of resin-wood combinations by high-frequency heating. The physical facts pertinent to high-frequency heating are introduced and the procedure is described for measuring dielectric constant and loss from 1 to 100 megacycles. The results indicated that the high-frequency heating process is feasible, flexible, and timesaving.
Date: December 1942
Creator: von Hippel, Arthur R. & Dietz, A. G. H.
Item Type: Refine your search to only Report
open access

Design of Tools for Press-Countersinking or Dimpling 0.040-Inch-Thick 24S-T Sheet

Description: "A set of dimpling tools was designed for 0.040-inch 24S-T sheet and flush-type rivets 1/8 inch in diameter with 100 degree countersunk heads. The dimples produced under different conditions of pressure, sheet thickness, and drill diameter are presented as cross-sectional photographs magnified 20 times. The most satisfactory values for the dimpling tools were found to be: maximum punch diameter, 0.231 inch; maximum die diameter, 0.223 inch; maximum mandrel diameter, 0.128 inch; dimple angle, 10… more
Date: August 1942
Creator: Templin, R. L. & Fogwell, J. W.
Item Type: Refine your search to only Report
open access

The Direct-Stress Fatigue Strength of 17S-T Aluminum Alloy Throughout the Range From 1/2 to 500,000,000 Cycles of Stress

Description: "Fatigue-tests were conducted on six specimens made from 3/4-inch-diameter 17S-T rolled-and-drawn rod for the purpose of obtaining additional data on the fatigue life of the material at stresses up to the static strength. The specimens were tested in direct tension using a stress range from zero to a maximum in tension. A static testing machine was used to apply repeated loads in the case of the first three specimens; the other three specimens were tested in a direct tension-compression fatigue… more
Date: September 1942
Creator: Hartmann, E. C. & Stickley, G. W.
Item Type: Refine your search to only Report
open access

Effect of rivet and spot-weld spacing on the strength of axially loaded sheet-stringer panels of 24S-T aluminum alloy

Description: Report presenting testing of eighteen 24S-T aluminum alloy sheet-stringer panels in end compression under carefully controlled edge conditions. Results regarding the strains, deflections, failure, and buckling of the sheet are provided.
Date: August 1942
Creator: Levy, Samuel; McPherson, Albert E. & Ramberg, Walter
Item Type: Refine your search to only Report
open access

The Effect of Valve Cooling Upon Maximum Permissible Engine Output as Limited by Knock

Description: "A Wright GR-1820-G200 cylinder was tested over a wide range of fuel-air ratios at maximum permissible power output as limited by knock with three different degrees of valve cooling. The valves used were stock valves (solid inlet valve and hollow sodium-cooled exhaust valve), hollow valves with no coolant, and hollow valves with flowing water as a coolant. Curves showing the variation in maximum permissible values of inlet-air pressure, indicated mean effective pressure, cylinder charge, and in… more
Date: September 1942
Creator: Munger, Maurice; Wilsted, H. D. & Mulcahy, B. A.
Item Type: Refine your search to only Report
open access

Effects of Range of Stress and of Special Notches on Fatigue Properties of Aluminum Alloys Suitable for Airplane Propellers

Description: "Laboratory tests were made to obtain information on the load-resisting properties of X76S-T aluminum alloy when subjected to static, impact, and repeated loads. Results are presented from static-load test of unnotched specimens in tension and in torsion and of notched specimens in tension. Charpy impact values obtained from bend tests on notched specimens and tension impact values for both notched and unnotched specimens tested at several different temperatures are included" (p. 1).
Date: June 1942
Creator: Dolan, Thomas J.
Item Type: Refine your search to only Report
open access

The Electrical Structure of Thunderstorms

Description: "The time histories of thunderstorm charge distribution during three storms occurring during the summer of 1940 in the vicinity of the Albuquerque Airport were investigated by the use of eight synchronized recording electrometers arranged in a particular pattern over a field 1.6 kilometers above sea level. The instruments produced simultaneous records of the changes in the surface potential gradient caused by lightning strokes and each one had a time-resolving power of 0.01 second" (p. 1).
Date: November 1942
Creator: Workman, E. J.; Holzer, R. E. & Pelsor, G. T.
Item Type: Refine your search to only Report
open access

An Exploration of the Longitudinal Tensile and Compressive Properties Throughout an Extruded Shape of 24S-T Aluminum Alloy

Description: Note presenting an investigation of tensile and compressive properties of specimens cut from an extruded shape of 24S-T aluminum alloy. The tensile strengths, tensile yield strengths, elongations, and compressive yield strengths of both the uncrystallized and recrystallized portions were determined. The strength of a cross section of an extruded shape is the weighted average of the strengths of the unrecrystallized and the recrystallized areas.
Date: December 1942
Creator: Paul, D. A.
Item Type: Refine your search to only Report
open access

Ground Effect on Downwash Angles and Wake Location

Description: "A theoretical study has been made of the reduction in downwash and upward displacement of the wake in the presence of the ground, and some verification of the theory has been obtained by means of air-flow measurements made with a ground-board and image-wing combination. Methods are given for estimating the effects and numerous examples are included to illustrate the nature of these effects and to show their order of magnitude" (p. 1).
Date: May 1942
Creator: Katzoff, S. & Sweberg, Harold H.
Item Type: Refine your search to only Report
open access

Improvement of Fatigue Life of an Aluminum Alloy by Overstressing

Description: "Fatigue tests were made on some 1.375-inch-diameter and 0.300-inch diameter specimens of a 17S-T aluminum alloy rod. One test of a large specimen was run continuously to failure at a maximum stress of 22,000 pounds per square inch. In two other tests of large specimens, thin surface layers were removed periodically until failure occurred. The same nominal maximum stress of 22,000 pounds per square inch was used throughout the two tests and the load on the fatigue machine was lowered accordingl… more
Date: August 1942
Creator: Stickley, G. W.
Item Type: Refine your search to only Report
open access

The Influence of Impact Velocity on the Tensile Characteristics of Some Aircraft Metals and Alloys

Description: Note presenting the results of tension tests on sixteen metals and alloys, most of which are employed extensively in aircraft construction. The tension characteristics are discussed for static conditions and rates of deformation up to about 150 feet per second. An investigation of the effect of decreasing the gage length of specimens below 1 inch is reported.
Date: October 1942
Creator: Clark, Donald S.
Item Type: Refine your search to only Report
open access

An investigation of the effectiveness of stiffeners on shear-resistant plate-girder webs

Description: From Summary: "The results of 60 different tests on 2 aluminum alloy 17S-T plate girders are presented to show the influence of size and spacing of stiffeners upon the buckling characteristics of shear-resistant webs within the elastic range. It is demonstrated that stiffeners increase the stability of a web by retarding the formation subdivided panels. An empirical method of proportioning stiffeners is proposed which recognizes both of these stiffener functions, and comparisons are made with d… more
Date: September 1942
Creator: Moore, R. L.
Item Type: Refine your search to only Report
open access

Investigation of the Forces Acting on Gliders in Automobile-, Pulley-, Winch-, and Airplane Towed Flight

Description: "The magnitude, the direction, and the fluctuation of towing forces exerted upon gliders by towing them aloft behind an automobile, by means of a winch, and by airplane were measured under a variety of conditions covering a range from gentle to severe types of operation. For these tests the towing forces did not exceed 92 percent of the gross weight of the glider. The results indicate that in pulley and winch towing the towing forces are of about the same magnitude as in automobile towing" (p. … more
Date: March 1942
Creator: Klemperer, W. B.
Item Type: Refine your search to only Report
open access

The Limiting Useful Deflections of Corrugated Metal Diaphragms

Description: Note presenting measurements made on a large number of corrugated diaphragms of similar shapes but of various sizes and various metals. Some of the materials studied include phosphor bronze, beryllium copper, A-Nickel, B-Monel, K-Monel, and Inconel. Results regarding pressure deflection, hysteresis, drift, aftereffect, recovery, and zero shift, and design and selection of diaphragms are provided.
Date: December 1942
Creator: Wildhack, W. A. & Goerke, V. H.
Item Type: Refine your search to only Report
open access

A Method for Determining the Camber and Twist of a Surface to Support a Given Distribution of Lift

Description: "A graphical method is described for finding the shape (camber and twist) of an airfoil having an arbitrary distribution of lift. The method consists in replacing the lifting surface and its wake with an equivalent arrangement of vortices and in finding the associated vertical velocities. By a division of the vortex pattern into circular strips concentric about the downwash point instead of into the usual rectangular strips, the lifting surface is reduced for each downwash point to an equivalen… more
Date: August 1942
Creator: Cohen, Doris
Item Type: Refine your search to only Report
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Normal-pressure tests of circular plates with clamped edges

Description: A fixture is described for making normal-pressure tests of flat plates 5 inches in diameter in which particular care was taken to obtain rigid clamping at the edges. Results are given for 19 plates, ranging in thickness from 0.015 to 0.072 inch. The center deflections and the extreme-fiber stresses at low pressures were found to agree with theoretical values; the center deflections at high pressures were 4 to 12 percent greater than the theoretical values. Empirical curves are derived of the pr… more
Date: June 1942
Creator: McPherson, Albert E.; Ramberg, Walter & Levy, Samuel
Item Type: Refine your search to only Report
open access

Normal-pressure tests of rectangular plates

Description: From Summary: "Normal-pressure tests were made of 56 rectangular plates with clamped edges and of 5 plats with freely supported edges. Pressure was applied and the center deflection and the permanent set at the center were measured. For some of the plates, strains and contours were measured in addition."
Date: June 1942
Creator: Ramberg, Walter; McPherson, Albert E. & Levy, Samuel
Item Type: Refine your search to only Report
open access

On the Distribution of Stress in a Thin Plate Elastically Supported Along Two Edges at Loads Beyond the Stability Limit

Description: Note presenting the results of an investigation on the distribution of stress in a plate elastically supported along two edges and subjected to compressive loads in a direction parallel to the elastically supported edges. A theoretical calculation was carried out in which the influence of the elastic support was taken into account.
Date: October 1942
Creator: Dunn, Louis G.
Item Type: Refine your search to only Report
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