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The Lagrangian Multiplier Method of Finding Upper and Lower Limits to Critical Stresses of Clamped Plates
"The theory of Lagrangian multipliers is applied to the problem of finding both upper and lower limits to the true compressive buckling stress of a clamped rectangular plate. The upper and lower limits thus bracket the truss, which cannot be exactly found by the differential-equation approach. The procedure for obtaining the upper limit, which is believed to be new, presents certain advantages over the classical Raleigh-Rite method of finding upper limits" (p. 1).
Date:
1946
Creator:
Budiansky, Bernard & Hu, Pai C.
System:
The UNT Digital Library
Single-Cylinder Oil-Control Tests of Porous Chrome Plated Cylinder Barrels for Radial Air-Cooled Engines
Report presenting a series of single-cylinder engine tests run to determine a satisfactory method of reducing oil consumption in radial air-cooled engines with flat-face compression rings as standard parts and equipped with cylinder barrels salvaged by porous chrome plating. Testing was conducted using porous chrome-plated cylinders with straight and choke bores with standard flat-face compression rings.
Date:
January 1946
Creator:
Johnson, Robert L. & Swikert, Max
System:
The UNT Digital Library
Effects of Specific Types of Surface Roughness on Boundary-Layer Transition
Report presenting tests of two typical low-drag airfoils of 90-inch chord to determine the effects of surface projections, grooves, and sanding scratches on boundary-layer transition. Data were obtained for projections of various sizes and chordwise locations on both low-drag airfoils.
Date:
February 1946
Creator:
Loftin, Laurence K., Jr.
System:
The UNT Digital Library
A General Method of Selecting Foam Inhibitors
Note presenting a criterion for selecting foam inhibitors from insoluble liquids that form emulsions with the foaming liquid. By determining the surface tensions of the foaming liquid and of the additive saturated with that liquid and the interfacial tension between them, spreading and entering coefficients may be calculated. A mechanism of foam inhibition is also described.
Date:
May 1946
Creator:
Robinson, J. V. & Woods, W. W.
System:
The UNT Digital Library
A Discussion of the Application of the Prandtl-Glauert Method to Subsonic Compressible Flow Over a Slender Body of Revolution
Note presenting an analysis of the use of the Prandtl-Glauert method for subsonic potential flow of a compressible fluid. This paper specifically focuses on the difference between the two- and three-dimensional flow when using this method.
Date:
September 1946
Creator:
Lees, Lester
System:
The UNT Digital Library
A preliminary study of a propeller powered by gas jets issuing from the blade tips
From Summary: "Computations are made of the performance of a propeller designed to develop 56 thrust horsepower at 100 miles per hour. The fuel consumption of the jet-operated propeller would be considerably higher than that of a reciprocating engine and a propeller. The lighter weight of the jet-operated propeller will result in a lighter weight of engine plus fuel for short-range flights. A theoretical analysis is made of a propeller powered by gas jets issuing from the blade tips."
Date:
November 1946
Creator:
Sanders, J. C. & Sanders, N. D.
System:
The UNT Digital Library
Comparison of relative sensitivities of the knock limits of two fuels to six engine variables
Report presenting knock testing of a sensitive fuel and a relatively insensitive fuel in a full-scale air-cooled cylinder. Six engine variables were investigated: fuel-air ratio, compression ratio, inlet-air temperature, spark advance, exhaust pressure, and cylinder temperature.
Date:
August 1946
Creator:
Cook, Harvey A.; Held, Louis F. & Pritchard, Ernest I.
System:
The UNT Digital Library
Flow Tests of an NACA-Designed Supercharger Inlet Elbow and the Effects of Various Components on the Flow Characteristics at the Elbow Outlet
Note presenting an investigation on a supercharger inlet elbow designed to have a uniform velocity distribution at the outlet with a minimum pressure loss through the bend. The effects of a vane, an impeller-shaft housing, and the combination of the two on the outlet-velocity distribution and total pressure drop through the elbow were determined.
Date:
October 1946
Creator:
Guentert, D. C.; Todd, D. J. & Simmons, W. P., Jr.
System:
The UNT Digital Library
Methods for Determination and Computation of Flow Patterns of a Compressible Fluid
Note presenting a well-known method of generating stream functions of an incompressible fluid flow, which involves taking the imaginary part of an analytic function of a complex variable. This paper is specifically devoted to a detailed discussion of performing computations related to obtaining flow patterns of compressible fluid from analytic functions of a compressible fluid. An example is also provided to illustrate the method.
Date:
September 1946
Creator:
Bergman, Stefan
System:
The UNT Digital Library
Performance of Hoods for Aircraft Exhaust-Gas Turbines
Report presenting the performance of a turbosupercharger turbine with three types of exhaust hood. The results for conical hoods, flat-nozzle hoods, and short-turning-radius hoods are provided.
Date:
November 1946
Creator:
Turner, L. Richard; Lowdermilk, Warren H. & Lord, Albert M.
System:
The UNT Digital Library
Compressive Strength of 24S-T Aluminum-Alloy Flat Panels With Longitudinal Formed Hat-Section Stiffeners
"Results are presented for a part of a test program on 24S-T aluminum alloy flat compression panels with longitudinal formed hat-section stiffeners. This part of the program is concerned with panels in which the thickness of the stiffener materials is 0.625 times the skin thickness. The results, presented in tabular and graphical form, show the effect of the relative dimensions of the panel on the buckling stress and the average stress at maximum load" (p. 1).
Date:
December 1946
Creator:
Schuette, Evan H.; Barab, Saul & McCracken, Howard L.
System:
The UNT Digital Library
The Synthesis and Purification of Aromatic Hydrocarbons 1: Butylbenzene
"A 13-gallon quantity of butylbenzene was synthesized and purified by large-scale preparation of 4-phenyl-1-butene from benzyl-magnesium chloride and allyl chloride with subsequent hydrogenation of the olefin. The physical constants for pure samples of 4-phenyl-1-butene and butylbenzene were determined and the position of the double bond in the olefin was established" (p. 1).
Date:
January 1946
Creator:
Karabinos, Joseph V. & Lamberti, Joseph M.
System:
The UNT Digital Library
A Relaxation Procedure for the Stress Analysis of a Continuous Beam-Column Elastically Restrained Against Deflection and Rotation at the Supports
Note presenting a method of stress analysis for a continuous beam-column supported by deflectional and rotational springs. The principal feature of the method is the use of a relaxation procedure to determine the deflections and rotations of the supports. The shears and moments at the supports and between the supports can then be calculated with the aid of sample equations and graphs.
Date:
October 1946
Creator:
Hu, Pai C. & Libove, Charles
System:
The UNT Digital Library
The effect of engine variables on the prediction-limited performance of three fuels
Report presenting preignition-limited performance data for S reference fuel, diisobutylene, and benzene with an engine-heated hot spot on a supercharged CFR engine at 11 sets of engine operating conditions. Results indicated that increases in compression ratio, spark advance, coolant temperature, or inlet-air temperature decreased the preignition-limited indicated mean effective pressure of all three fuels.
Date:
September 1946
Creator:
Male, Donald W.
System:
The UNT Digital Library
Flight investigation of the cooling characteristics of a two-row radial engine installation 3: engine temperature distribution
From Summary: "The temperature distribution of a two-row radial engine in a twin-engine airplane has been investigated in a series of flight tests. The test engine was operated over a wide range of conditions at density altitudes of 5000 and 20,000 feet; quantitative results are presented showing the effects of flight and engine variables upon average engine temperature and over-all temperature spread. Discussions of the effect of the variables on the shape of the temperature patterns and on the temperature distribution of individual cylinders are also included."
Date:
October 1946
Creator:
Rennak, Robert M.; Messing, Wesley E. & Morgan, James E.
System:
The UNT Digital Library
Pressure Distributions for Representative Airfoils and Related Profiles
Note presenting selected pressure-distribution diagrams for a number of conventional and special airfoils. The conventional airfoils include the NACA 22, 44, and 230 series airfoils and Clark Y family and the special airfoils consist of circular-arc sections of several thicknesses and a number of synthetic airfoils. The pressure distributions are in most cases given for several lift coefficients including that at the ideal angle of attack.
Date:
February 1946
Creator:
Theodorsen, Theodore & Naiman, Irven
System:
The UNT Digital Library
An Electron Microscope Study of Used Nitrated-Steel Piston Rings
Note presenting a study of the altered surface layers found on nitrided-steel piston rings run in nitrided-steel cylinder barrels in order to determine the physical and chemical characteristics of the altered layers and the mechanism by which the coating layers were formed. An electron and a light microscope were used to study different aspects of the materials.
Date:
September 1946
Creator:
Clark, Thomas P. & Vierthaler, Walter A.
System:
The UNT Digital Library
Investigation of the Stability of the Laminar Boundary Layer
Note presenting an investigation of the stability of two-dimensional laminar flows of a gas by the method of small perturbations. The chief emphasis is placed on the case of the laminar boundary layer.
Date:
September 1946
Creator:
Lees, Lester & Lin, Chia Chiao
System:
The UNT Digital Library
A method for the determination of air infiltration rates in airplane cabins
From Summary: "A method for the experimental determination of the rate of infiltration of air into aircraft cabins during flight has been developed and tested. This method consists of releasing a quantity of gas in the cabin and calculating the infiltration rate from the measured rate of change of the gas concentration. The results of the flight tests indicate that after the infiltration rate is established at one altitude and airspeed, the infiltration rates at other altitudes and airspeeds can be calculated."
Date:
April 1946
Creator:
Stalder, Jackson R. & Zeiller, E. Lewis
System:
The UNT Digital Library
Stress Rupture of Heat Resisting Alloys as a Rate Process
Note presenting the application of the equations of the theory of rate processes to stress rupture in order to predict the experimental stress and temperature dependence of the time for rupture for three heat-resisting alloys. Results regarding stress dependence, temperature dependence of slope factor, and temperature dependence of apparent free energy of activation are provided.
Date:
September 1946
Creator:
Machlin, E. S. & Nowick, A. S.
System:
The UNT Digital Library
Strain-Gage Study of Internally Cooled Exhaust Valves Having Various Throat Designs
Note presenting three internally cooled exhaust valves with the same external dimensions but different throat designs were investigated to determine a method of obtaining increased coolant-flow area with increasing stresses. The valves were statistically loaded to simulate stresses in the throat region caused by valve closure.
Date:
August 1946
Creator:
Holms, Arthur G. & Faldetta, Richard D.
System:
The UNT Digital Library
The Synthesis and Purification of Aromatic Hydrocarbons 2: 1, 2, 4-Trimethylbenzene
Note presenting a new method for the synthesis and purification of a 14-gallon quantity of 1,2,4-trimethylbenzene. The method consists in the chloromethylation of m- and p-xylenes, subsequent formation of ethyl dimethylbenzyl ethers, and hydrogenolysis of the ethers to yield the hydrocarbon. Results regarding chloromethylation of xylene, conversion of dimethylbenzyl chlorides to ethyl dimethylbenzyl ethers, hydrogenolysis of the ethyl dimethylbenzyl ethers, and identification of biproducts are provided.
Date:
January 1946
Creator:
Ebersole, Earl R.
System:
The UNT Digital Library
Turbosupercharger-Rotor Temperatures in Flight
Note presenting temperatures of a turbosupercharger rotor measured in flight for a variety of conditions by thermocouples, the leads of which were brought away from the turbine by means of rotating slip rings and stationary brushes. A consistent and almost linear relation was shown between turbine temperature at the outer edge of the rim and the effective exhaust-gas temperature at the surfaces of the blades on three successive flights at cruising power.
Date:
October 1946
Creator:
Bartoo, Edward R.
System:
The UNT Digital Library
The Synthesis and Purification of Aromatic Hydrocarbons 3: Isobutylbenzene, Sec-Butylebenzene and Tert-Butylbenzene
Note presenting a description of the synthesis of isobutylbenzene, sec-butylbenzene, and tert-butylbenzene in 11-gallon quantities. The physical properties are tabulated and freezing curves are plotted for the five hydrocarbons.
Date:
June 1946
Creator:
Buess, C. M.; Karabinos, J. V.; Kunz, P. V. & Gibbons, L. C.
System:
The UNT Digital Library