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The Ames 10- by 14-Inch Supersonic Wind Tunnel

Description: "The purpose of the present report is to describe the 10- by 14-inch supersonic wind tunnel and its operational characteristics over the nominal Mach number range from 2.7 to 6.3. Rather complete calibration data on characteristics of flow in the test section are presented and briefly discussed" (p. 2).
Date: January 1954
Creator: Eggers, A. J., Jr. & Nothwang, George J.
Partner: UNT Libraries Government Documents Department
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Analysis of Straight Multicell Wings on Cal-Tech Analog Computer

Description: Note presenting structural analyses made for four straight multicell wings. Wings with aspect ratios of 2 and 4 with rectangular and biconvex cross sections have been considered. The results indicated that under bending loads, all of the wings show fairly good agreement with beam theory.
Date: January 1954
Creator: Benscoter, Stanley U. & MacNeal, Richard H.
Partner: UNT Libraries Government Documents Department
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Analysis of Sweptback Wings on Cal-Tech Analog Computer

Description: Note presenting structural analyses made of two 45 degree swept wings of aspect ratio 3. One has a constant depth and the other had a constant biconvex cross section in planes parallel to the air stream. Deflections, all internal forces, and vibration modes have been calculated for concentrated static loads.
Date: January 1954
Creator: MacNeal, Richard H. & Benscoter, Stanley U.
Partner: UNT Libraries Government Documents Department
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Application of several methods for determining transfer functions and frequency response of aircraft from flight data

Description: In the process of analyzing the longitudinal frequency-response characteristics of aircraft, information on some of the methods of analysis has been obtained by the Langley Aeronautical Laboratory of the National Advisory Committee for Aeronautics. In the investigation of these methods, the practical applications and limitations were stressed. In general, the methods considered may be classed as: (1) analysis of sinusoidal response, (2) analysis of transient response as to harmonic content thro… more
Date: 1954
Creator: Eggleston, John M. & Mathews, Charles W.
Partner: UNT Libraries Government Documents Department
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Average Skin-Friction Drag Coefficients From Tank Tests of a Parabolic Body of Revolution (NACA RM-10)

Description: Average skin-friction drag coefficients were obtained from boundary-layer total-pressure measurements on a parabolic body of revolution (NACA rm-10, basic fineness ratio 15) in water at Reynolds numbers from 4.4 x 10(6) to 70 x 10(6). The tests were made in the Langley tank no. 1 with the body sting-mounted at a depth of two maximum body diameters. The arithmetic mean of three drag measurements taken around the body was in good agreement with flat-plate results, but, apparently because of the s… more
Date: 1954
Creator: Mottard, Elmo J. & Loposer, J. Dan
Partner: UNT Libraries Government Documents Department
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Axial-load fatigue properties of 24S-T and 75S-T aluminum alloy as determined in several laboratories

Description: In the initial phase of a NACA program on fatigue research, axial-load tests on 24S-T3 and 75S-T6 aluminum-alloy sheet have been made at the Battelle Memorial Institute and at the Langley Aeronautical Laboratory of the National Advisory Committee for Aeronautics. The test specimens were polished and unnotched. The manufacturer of the material, the Aluminum Company of America, has made axial-load tests on 24S-T4 and 75S-T6 rod material. The test techniques used at the three laboratories are desc… more
Date: 1954
Creator: Grover, H. J.; Hyler, W. S.; Kuhn, Paul; Landers, Charles B. & Howell, F. M.
Partner: UNT Libraries Government Documents Department
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Behavior of materials under conditions of thermal stress

Description: A review is presented of available information on the behavior of brittle and ductile materials under conditions of thermal stress and thermal shock. For brittle materials, a simple formula relating physical properties to thermal-shock resistance is derived and used to determine the relative significance of two indices currently in use for rating materials. For ductile materials, thermal-shock resistance depends upon the complex interrelation among several metallurgical variables which seriousl… more
Date: 1954
Creator: Manson, S. S.
Partner: UNT Libraries Government Documents Department
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Charts Relating the Compressive Buckling Stress of Longitudinally Supported Plates to the Effective Deflectional and Rotational Stiffness of the Supports

Description: "A stability analysis is made of a long flat rectangular plate subjected to a uniform longitudinal compressive stress and supported along its longitudinal edges and along one or more longitudinal lines by elastic line supports. The elastic supports possess deflectional and rotational stiffness. Such configuration is an idealization of the compression cover skin and internal structure of a wing and tail surfaces" (p. 1).
Date: 1954
Creator: Anderson, Roger A. & Semonian, Joseph W.
Partner: UNT Libraries Government Documents Department
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Correlations involving pressure fluctuations in homogeneous turbulence

Description: Report presenting an investigation of the correlations of pressure with itself and of pressure with two velocity components for the case of isotropic turbulence. The correlations are expressed in terms of correlations involving two velocity components at a point and two velocity components at another point.
Date: January 1954
Creator: Uberoi, Mahinder S.
Partner: UNT Libraries Government Documents Department
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Creep Bending and Buckling of Linearly Viscoelastic Columns

Description: Note presenting the general dynamic equation of creep bending of a beam loaded laterally and axially as derived for a linearly viscoelastic material whose mechanical properties can be characterized by four parameters. The equation derived was used to obtain the creep bending deflection of a beam in pure bending and of a column with initial sinusoidal deviation from straightness.
Date: January 1954
Creator: Kempner, Joseph
Partner: UNT Libraries Government Documents Department
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Creep Bending and Buckling of Nonlinearly Viscoelastic Columns

Description: Note presenting differential equations of bending of an idealized H-section beam column derived for a nonlinearly viscoelasic material whose mechanical properties are analogous to a model consisting of a linear spring in series with a nonlinear dashpot whose strain rate is proportional to a power of the applied stress. The resulting constant stress or load creep curve consists of a straight line, the slope of which can be considered as the secondary creep rate of a real material.
Date: January 1954
Creator: Kempner, Joseph
Partner: UNT Libraries Government Documents Department
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Creep buckling of columns

Description: Report presenting formulas for the determination of the creep deflection-time characteristics of an initially curved idealized H-section column. The results were obtained from closed-form solutions of the differential equation of bending of a beam column with creep properties of a nonlinearly viscoelastic nature. Critical time is tabulated and plotted for a wide range of parameters involved.
Date: January 1954
Creator: Kempner, Joseph & Patel, Sharad A.
Partner: UNT Libraries Government Documents Department
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Data on the compressive strength of skin-stringer panels of various materials

Description: "Flat skin-stringer compression panels of stainless steel, mild steel, titanium, copper, four aluminum alloys, and a magnesium alloy were tested. The results show the effect of variations in yield stress, Young's modulus, and both yield stress and Young's modulus for constant yield strain on the average stress at maximum load, on the stress for local buckling, and on the load-shortening characteristics of the panels" (p. 1).
Date: January 1954
Creator: Dow, Norris F.; Hickman, William A. & Rosen, B. Walter
Partner: UNT Libraries Government Documents Department
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Design Data for Multipost-Stiffened Wings in Bending

Description: From Summary: "The results of a computational program are presented which give numerical values of the stiffnesses required of the various components of a multipost-stiffened wing to achieve desired buckling-stress values under bending loads. Two arrangements of the posts are considered, upright posts and posts used as diagonals of a Warren truss. This work extends and summarizes the calculations presented in NACA RM L52K10a."
Date: January 1954
Creator: Anderson, Roger A.; Johnson, Aldie E., Jr. & Wilder, Thomas W., III
Partner: UNT Libraries Government Documents Department
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Development of Turbulence-Measuring Equipment

Description: "Hot wire turbulence-measuring equipment has been developed to meet the more stringent requirements involved in the measurement of fluctuations in flow parameters at supersonic velocities. The higher mean speed necessitates the resolution of higher frequency components than at low speed, and the relatively low turbulence level present at supersonic speed makes necessary an improved noise level for the equipment. The equipment covers the frequency range from 2 to about 70,000 cycles per second" … more
Date: 1954
Creator: Kovasznay, Leslie S. G.
Partner: UNT Libraries Government Documents Department
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Ditching Investigation of a 1/10-Scale Model of the North American F-86 Airplane

Description: "An investigation was made of a 1/10-scale dynamically similar model of the North American F-86 airplane to study its behavior when ditched. The model was landed in calm water at the Langley tank no. 2 monorail. Various landing attitudes, speeds, and conditions of damage were simulated. The behavior of the model was determined from visual observations, acceleration records, and motion-picture records of the ditchings" (p. 1).
Date: 1954
Creator: Fisher, Lloyd J. & McBride, Ellis E.
Partner: UNT Libraries Government Documents Department
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Effect of Surface Roughness Over the Downstream Region of a 23 Degree Conical Diffuser

Description: Note presenting an experimental investigation conducted to determine the effects of varying extents of surface roughness over the downstream region of a 23 degree conical diffuser with an inlet-boundary-layer thickness of the order of 5 percent of the inlet diameter. The air flows used in the investigation cover an inlet Mach number range from about 0.10 to 0.40. The results indicate that the flow in the roughened diffuser was steady and reproducible for all conditions.
Date: January 1954
Creator: Persh, Jerome & Bailey, Bruce M.
Partner: UNT Libraries Government Documents Department
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Effect of Variable Viscosity and Thermal Conductivity on High-Speed Slip Flow Between Concentric Cylinders

Description: "Schamberg was the first to solve the differential equations of slip flow, including the Burnett terms, for concentric circular cylinders assuming constant coefficients of viscosity and thermal conductivity. The problem is solved for variable coefficients of viscosity and thermal conductivity in this paper by applying a transformation which leads to an iteration method. Starting with the solution for constant coefficients, this method enables one to approximate the solution for variable coeffic… more
Date: 1954
Creator: Lin, T. C. & Street, R. E.
Partner: UNT Libraries Government Documents Department
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Effect of Various Arrangements of Triangular Ledges on the Performance of a 23 Degree Conical Diffuser at Subsonic Mach Numbers

Description: Note presenting an investigation to determine whether the use of annular ledges to promote turbulent momentum exchange will improve the performance of a short, wide-angle diffuser. Results are presented of tests of a 23 degree conical diffuser with a 2:1 ratio of exit to inlet area with both rough and smooth triangular ledges, approximately one-tenth of the inlet boundary-layer thickness in height, installed in succession from the inlet to the exit. Results regarding rough ledges, comparison be… more
Date: January 1954
Creator: Persh, Jerome & Bailey, Bruce M.
Partner: UNT Libraries Government Documents Department
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Elastic Buckling Under Combined Stresses of Flat Plates With Integral Waffle-Like Stiffening

Description: "Theory and experiment were compared and found in good agreement for the elastic buckling under combined stresses of long flat plates with integral waffle-like stiffening in a variety of configurations. For such flat plates, 45 degree waffle stiffening was found to be the most effective of the configurations for the proportions considered over the widest range of combinations of compression and shear" (p. 1).
Date: January 1954
Creator: Dow, Norris F.; Levin, L. Ross & Troutman, John L.
Partner: UNT Libraries Government Documents Department
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Experimental investigation at a Mach number of 2.41 of average skin-friction coefficients and velocity profiles for laminar and turbulent boundary layers and an assessment of probe effects

Description: Report presenting an experimental investigation of laminar and turbulent boundary layers on the outer surface of a hollow cylinder at Mach number 2.41 and a range of Reynolds numbers. Results regarding static-pressure distribution, Schileren observations, velocity profiles, boundary-layer transition, determination of effective leading edge for turbulent flow, skin friction, and probe effect are provided.
Date: January 1954
Creator: O'Donnell, Robert M.
Partner: UNT Libraries Government Documents Department
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Fatigue tests at stresses producing failure in 2 to 10,000 cycles: 24S-T3 and 75S-T6 aluminum-alloy sheet specimens with a theoretical stress-concentration factor of 4.0 subjected to completely reversed axial load

Description: Report presenting testing of notched specimens made of 24S-T3 and 75S-T6 aluminum-alloy sheet material, with theoretical stress-concentration factors equal to 4.0, subjected to completely reversed axial loads. Test techniques and special test apparatus are described.
Date: January 1954
Creator: Hardrath, Herbert F. & Illg, Walter
Partner: UNT Libraries Government Documents Department
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Formulas for the Elastic Constants of Plates With Integral Waffle-Like Stiffening

Description: "Formulas are derived for the fifteen elastic constants associated with bending, stretching, twisting, and shearing of plates with closely spaced integral ribbing in a variety of configurations and proportions. In the derivation the plates are considered, conceptually, as more uniform orthotropic plates somewhat on the order of plywood. The constants, which include the effectiveness of the ribs for resisting deformations other than bending and stretching in their longitudinal directions, are de… more
Date: 1954
Creator: Dow, Norris F.; Libove, Charles & Hubka, Ralph E.
Partner: UNT Libraries Government Documents Department
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