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Effect of Temperature on Dynamic Modulus of Elasticity of Some Structural Alloys
Note presenting the effect of temperature on Young's modulus of elasticity as determined for 2024-T3 and 7075-T6 aluminum alloys, AZ31A-0 magnesium alloy, RS-120 titanium alloy, and type 303 stainless steel by flexural vibration tests of beam specimens at temperatures from room temperature to 900 degrees Fahrenheit. The test frequencies were varied from 40 to 550 cycles per second.
Date:
August 1958
Creator:
Vosteen, Louis F.
System:
The UNT Digital Library
Investigation of Mach Number Changes Obtained by Discharging High-Pressure Pulse Through Wind Tunnel Operating Supersonically
Note presenting a series of tests to obtain an indication of the transient-flow phenomena caused by discharging a chamber of high-pressure gas into a wind tunnel operating supersonically. Two types of gust were obtained for the configurations tested. Results regarding two-dimensional conventional nozzles and axially symmetric multinozzle are provided.
Date:
August 1954
Creator:
Haefeli, Rudolph C. & Bernstein, Harry
System:
The UNT Digital Library
Investigation of nickel-aluminum alloys containing from 14 to 34 percent aluminum
Report presenting an investigation of nickel-aluminum alloys which were from 14 to 34 percent aluminum by weight as part of a study of the properties of intermetallics. Results regarding the quality of castings, physical evaluation of cast alloys, hot formability of alloys, physical properties of 17.5-percent-aluminum alloy, microstructure of 17.5-percent-aluminum alloy, the casting method, and other properties of the intermetallics are provided.
Date:
August 1954
Creator:
Maxwell, W. A. & Grala, E. M.
System:
The UNT Digital Library
Internal-Friction Study of Aluminum Alloy Containing 4 Weight Percent Copper
Note presenting a study of aluminum alloy containing 4 weight percent copper during aging using low-frequency internal-friction measurements in torsional and flexural vibration. Both polycrystalline and single-crystal specimens exhibit an initial internal-friction peak at 173 degrees Celsius after solution treatment and quenching.
Date:
August 1958
Creator:
Berry, B. S. & Nowick, A. S.
System:
The UNT Digital Library
Rotating-stall characteristics of a rotor with high hub-tip radius ratio
Report presenting an investigation of the rolling-stall characteristics of a 0.9 hub-tip ratio rotor. Stall patterns consisting of two, three, and one total-span stall zones developed in that order upon reduction of flow coefficient. Results regarding performance and stall characteristics, rotor pressure-rise coefficient, flow fluctuations due to rotating stall, pressure fluctuations due to rotating stall, temperature fluctuations due to rotating stall, and discussion of rotating stall and comparison with theory are provided.
Date:
August 1955
Creator:
Costilow, Eleanor L. & Huppert, Merle C.
System:
The UNT Digital Library
Column Strength of H-Sections and Square Tubes in Postbuckling Range of Component Plates
Note presenting a calculation of the column buckling stress in the range where the component plates have buckled using the method of split rigidities. Tests were carried out for a considerable range of slenderness ratios on three H-sections and two square tube sections.
Date:
August 1953
Creator:
Bijlaard, P. P. & Fisher, G. P.
System:
The UNT Digital Library
Low-speed experimental investigation of the magnus effect on various sections of a body of revolution with and without a propeller
Report presenting an investigation at low speed to determine the Magnus effect on various sections of a body of revolution of which several sections could be rotated either as individual units or in combinations. The investigation included the measurement of the Magnus effect on the body alone and on the body with a three-blade propeller.
Date:
August 1957
Creator:
Queijo, M. J. & Fletcher, Herman S.
System:
The UNT Digital Library
Approximate analysis of effects of large deflections and initial twist on torsional stiffness of a cantilever plate subjected to thermal stresses
Report presenting an approximate analysis of the nonlinear effects of initial twist and large deflections on the torsional stiffness of a cantilever plate subjected to a nonuniform temperature distribution. The results show that the initial twist and applied moments can have significant effects on the changes in stiffness produced by nonuniform heating. Results regarding the general results of equations and comparison with experiment are provided.
Date:
August 1957
Creator:
Heldenfels, Richard R. & Vosteen, Louis F.
System:
The UNT Digital Library
Accelerations and passenger harness loads measured in full-scale light-airplane crashes
From Introduction: "Light-airplane accident data, compiled by Crash Injury Research of Cornell University Medical College, indicate that human beings have often withstood declarations in excess of those imposed in airplane crashes involving extensive damage to the airplane structure (ref. 1). This study also correlates the extent of damage to the airplane structure with the injury incurred by the occupants during crash accidents."
Date:
August 1953
Creator:
Eiband, A. Martin; Simpkinson, Scott H. & Black, Dugald O.
System:
The UNT Digital Library
Tensile properties of Inconel X sheet under rapid-heating and constant-temperature conditions
From Summary: "Results of rapid-heating tests of Inconel X sheet are presented for nominal temperature rates of 0.2 degrees F to 100 degrees F per second under constant tensile load conditions. Yield and rupture stresses obtained under rapid-heating conditions are compared with the results of conventional tensile stress-train tests at elevated temperatures. A marked increase in strength is observed with increased temperature rates."
Date:
August 1957
Creator:
Kurg, Ivo M.
System:
The UNT Digital Library
Application of a characteristic blade-to-blade solution to flow in a supersonic rotor with varying stream-filament thickness
From Introduction: "A solution of the type of reference 2 is necessary to give the stream-sheet thickness and curvature for the blade-to-blade (S1 surface) solution considered in this report. The equations for the solution of the S1 surface of revolution are presented in reference 3. The purpose of the subject report is to continue the work of reference 3 by applying the method to a specific problem in order that the practicability of the method and the time involved in computing a solution may be determined."
Date:
August 1953
Creator:
Costilow, Eleanor L.
System:
The UNT Digital Library
A Method Utilizing Data on the Spiral, Roll-Subsidence, and Dutch Roll Modes for Determining Lateral Stability Derivatives From Flight Measurements
Note presenting a method for determining lateral stability derivatives from flight measurements, which is obtained by arranging the lateral equations of motion in such form that information from each of the three modes of lateral motion may be utilized. The method permits determination of all the important derivatives without requiring an estimation of any of the derivatives. Results regarding the probable errors in measurements, errors in derivatives, effect of side-force rate derivatives, and some improvements in the method are provided.
Date:
August 1957
Creator:
Klawans, Bernard B. & White, Jack A.
System:
The UNT Digital Library
Some Investigations of the General Instability of Stiffened Metal Cylinders 3: Continuation of Tests of Wire-Braced Specimens and Preliminary Tests of Sheet-Covered Specimens
"This is the third of a series of reports covering an investigation of the general instability problem by the California Institute of Technology. The first five reports of this series cover investigations of the general instability problem under the loading conditions of pure bending and were prepared under the sponsorship of the Civil Aeronautics Administration. The succeeding reports of this series cover the work done on other loading conditions under the sponsorship of the National Advisory Committee for Aeronautics" (p. 1).
Date:
August 1943
Creator:
unknown
System:
The UNT Digital Library
Some Factors Affecting the Variation of Pitching Moment With Sideslip of Aircraft Configurations
Note presenting a brief study of available wind-tunnel data with regard to the variation of pitching moment with sideslip. The results indicate that the effect of sideslip on pitching moment can be large and is dependent on a number of factors. Results regarding wing characteristics, wing-body characteristics, horizontal-tail characteristics, and flat fuselages are provided.
Date:
August 1958
Creator:
Polhamus, Edward C.
System:
The UNT Digital Library
Matrix method for obtaining spanwise moments and deflections of torsionally rigid rotor blades with arbitrary loadings
From Summary: "A matrix solution for the spanwise bending moments and deflections of a torsionally rigid rotor blade subjected to an arbitrary loading is presented. The method includes the cantilever, teetering, and hinged blades in hovering and in steady forward flight. The method is comparatively short, involves only standard matrix procedures, and does not require that the mode shapes or natural frequencies be known."
Date:
August 1958
Creator:
Mayo, Alton P.
System:
The UNT Digital Library
A Correlation of Results of a Flight Investigation With Results of an Analytical Study of Effects of Wing Flexibility on Wing Strains Due to Gusts
Report presenting a study of the effects of wing flexibility on wing strains due to gusts for four spanwise stations of a four-engine bomber airplane and a correlation with previous testing results. Results regarding the power spectre, peak counts, amplification factors, statistical reliability, input disturbance, frequency-response functions, output response, and amplification factors are provided.
Date:
August 1957
Creator:
Shufflebarger, C. C.; Payne, Chester B. & Cahen, George L.
System:
The UNT Digital Library
Boundary-layer stability diagrams for electrically conducting fluids in the presence of a magnetic field
From Summary: "The effectiveness of a magnetic field in stabilizing the laminar flow of an incompressible, electrically conducting fluid is studied. The neutral stability curves pertaining to a two-dimensional sinusoidal disturbance are presented for flow over a semi-infinite flat plate in the presence of either a coplanar or transverse magnetic field and for channel flow in the presence of a coplanar or transverse magnetic field and for channel flow in the presence of a coplanar magnetic field. As is to be expected, the magnetic field stabilizes the flow unless the velocity profile is distorted by the magnetic field to an inherently unstable shape."
Date:
August 1958
Creator:
Rossow, Vernon J.
System:
The UNT Digital Library
A Discussion of Cone and Flat-Plate Reynolds Numbers for Equal Ratios of the Laminar Shear to the Shear Caused by Small Velocity Fluctuations in a Laminar Boundary Layer
"By use of the linear theory of boundary-layer stability and Schlichting's formula for the maximum amplification of a disturbance, an approximate relation is derived between the Reynolds number on a cone and the Reynolds number on a flat plate for equal closeness to transition. The indication is that the ratio of the cone Reynolds number for transition, based on the distance to the cone apex, to the plate Reynolds number for transition, based on the distance to the leading edge, is not in general equal to 3, as has been suggested by other investigators, but varies from 3 when transition occurs at the minimum critical Reynolds number to unity when transition occurs at a large multiple of the critical Reynolds number" (p. 1).
Date:
August 1957
Creator:
Tetervin, Neal
System:
The UNT Digital Library
Torsional Vibrations of Hollow Thin-Walled Cylindrical Beams
Note presenting the differential equations and boundary conditions appropriate to the analysis of torsional vibrations of hollow thin-walled cylindrical beams. The results indicate that the numerical calculations show that elementary theory is adequate for the analysis of torsional vibrations of box beams with high or medium plan-form aspect ratios.
Date:
August 1954
Creator:
Kruszewski, Edwin T. & Kordes, Eldon E.
System:
The UNT Digital Library
The aerodynamics of a wind-tunnel fan
From Introduction: "This paper deals only with the aerodynamics of the fan proper and demonstrates the manner in which the radial distribution of axial velocity of fluid through a fan is governed by geometry of the fan itself."
Date:
August 1941
Creator:
Corson, Blake W.
System:
The UNT Digital Library
An analysis of normal-acceleration and airspeed data from a four-engine type of transport airplane in commercial operation on an eastern united states route from November 1947 to February 1950
Report presenting an analysis of 48,187 hours of normal-acceleration and airspeed data obtained on a four-engine type of transport airplane in commercial operation on an eastern United States route from November 1947 to February 1950 to determine gusts and gust loads for operations. Results regarding the presentation of data, effect of changes in operating conditions, effect of seasons, comparison with other results, reliability, acceleration, gusts, and airspeeds are provided.
Date:
August 1953
Creator:
Coleman, Thomas L. & Schumacher, Paul W. J.
System:
The UNT Digital Library
Mechanical Properties at Room Temperature of Four Cermets of Titanium Carbide with Nickel Binder
"Room-temperature stress-strain curves are presented for compression, tension, and shear loadings on four compositions of titanium carbide with nickel binder. Values of ultimate strength, modulus of elasticity, modulus of rigidity, Poisson's ratio in the elastic region, density, and hardness for the four materials are tabulated" (p. 1).
Date:
August 1954
Creator:
Johnson, Aldie E., Jr.
System:
The UNT Digital Library
Compressive Stress-Strain Properties of 17-7 PH and AM 350 Stainless-Steel Sheet at Elevated Temperatures
Note presenting compressive stress-strain test results for 17-7 PH and AM 350 stainless-steel sheet in the heat-treated and annealed conditions for temperatures from room temperature to 1200 degrees Fahrenheit. Representative stress-strain curves are given for both materials at the test temperatures.
Date:
August 1957
Creator:
Stein, Bland A.
System:
The UNT Digital Library
Wind-tunnel studies of the performance of multirotor configurations
Report presenting the power requirements measured in static thrust and in level forward flight for two helicopter rotor configurations. One is a coaxial rotor arrangement with the rotors spaced approximately 19 percent of the rotor radius; the other is a tandem configuration in which the rotor-shaft spacing is 3 percent greater than the rotor diameter and in which the rotors lie in the same plane.
Date:
August 1954
Creator:
Dingeldein, Richard C.
System:
The UNT Digital Library