Serial/Series Title
Country
Year
Month
4,107 Matching Results
Results open in a new window/tab.
The 6-Foot-4-Inch Wind Tunnel at the Washington Navy Yard
Report discussing the 6-foot-4-inch wind tunnel and its auxiliary equipment has proven itself capable of continuous and reliable output of data. The real value of the tunnel will increase as experience is gained in checking the observed tunnel performance against full-scale performance. Such has been the case of the 8- by 8-foot tunnel, and for that reason the comparison in the calibration tests have been presented.
Date:
August 1935
Creator:
Desmond, G. L. & McCrary, J. A.
System:
The UNT Digital Library
The 1350 F stress-rupture properties of two wrought alloys and three cast alloys
From Summary: "These properties compare favorably with those of the strongest similar alloys previously investigated. However, compared with a 60Cr-25Fe-15Mo alloy, the three cobalt-chronium-nickel cast alloys are inferior. A correlation of NACA and OSRD (Project NRC-8) data is presented, showing the variation of rupture strengths with temperature in the range of 1350^o to 2000^o for alloys."
Date:
November 1947
Creator:
Reynolds, E. E.; Freeman, J. W. & White, A. E.
System:
The UNT Digital Library
The Strength of Semielliptical Cylinders Subjected to Combined Loadings
"The present report covers tests made on elliptical cylinders with a center support which were subjected to various simple and combined loadings. The tests yielded a series of interaction curves for combined loadings on such cylinders which should be useful in wing nose section analysis" (p. 1).
Date:
February 1945
Creator:
Sechler, E. E. & Frederick, J. L.
System:
The UNT Digital Library
Bibliography of piston ring lubrication
Report presenting a survey of the technical information contained in the literature on the subject of lubrication, friction, and wear of aircraft engine piston rings.
Date:
October 1944
Creator:
Hersey, Mayo D.
System:
The UNT Digital Library
Fairing Compositions for Aircraft Surfaces
Note presenting fairing compositions applied to aircraft surfaces, welds and junctions of metal plates, and rivet depressions to improve the aerodynamic efficiency of the airplane at high speeds. A method is described for formulating fairing compositions which have, within limits, desired coefficients of thermal expansion. Results regarding water-immersion tests, thermal expansion and softening temperature, temperature-cycle tests, and density are provided.
Date:
November 1944
Creator:
Turner, Philip S.; Doran, Jewel & Reinhart, Frank W.
System:
The UNT Digital Library
Torsion Test to Failure of a Monocoque Box
Note presenting a torsion test to failure for a monocoque box of 24S-T aluminum alloy. The box had a rectangular section and was reinforced by Z-stringers, antirolls, bulkheads, and corner posts.
Date:
October 1944
Creator:
McPherson, A. E.; Goldenberg, D. & Zibritosky, G.
System:
The UNT Digital Library
Tests on Thin-Walled Celluloid Cylinders to Determine the Interaction Curves Under Combined Bending, Torsion, and Compression or Tension Loads
Note presenting a two part report on cylinder; one is on the modulus of electricity of celluloid sheet and the effect of temperature change on the value of the modulus of elasticity, while the other gives the results of tests on a considerable number of thin-walled, circular celluloid cylinders of several lengths, diameters, and wall thicknesses.
Date:
January 1945
Creator:
Bruhn, Elmer F.
System:
The UNT Digital Library
Numerical procedures for the calculation of the stresses in monocoques 2: diffusion of tensiles stringer loads in reinforced flat panels with cut-outs
Report presenting experiments with a flat reinforced sheet model, the longitudinals of which were loaded axially. Two groups of sheets, one with one panel and one with two panels, were cut out and the stress distributions in stringers and sheet was measured with electric strain gages.
Date:
November 1944
Creator:
Hoff, N. J. & Kempner, Joseph
System:
The UNT Digital Library
Performance tests of wire strain gages 1: calibration factors in tension
Report presenting calibrations in axial tension over the strain range from 0 to 0.0024 are presented for 15 types of single element multistrand wire strain gages. The majority of the gages showed significant differences between the calibration factors for strain increasing and strain decreasing. Improvement in gage performance after preloading was apparent in most cases.
Date:
November 1944
Creator:
Campbell, William R.
System:
The UNT Digital Library
A unit laboratory engine oil system providing for a remote indication of oil flow and oil consumption together with blow-by measurement
From Summary: "A unit oil system and oil-weighing device designed for laboratory engine tests to permit the remote measurement of oil-flow rate and oil consumption is described. The system regulates the oil pressure and temperature and is closed to make possible the accurate measurement of blow-by gas. The oil is weighed by a self-contained diaphragm and pilot-valve assembly, which uses compressed air as the transmitting medium. Several of those unit systems have given satisfactory service for more than a year."
Date:
September 1944
Creator:
Koffel, William K. & Biermann, Arnold E.
System:
The UNT Digital Library
Axial Fatigue Tests at Zero Mean Stress of 24S-T Aluminum-Alloy Sheet With and Without a Circular Hole
"Axial fatigue tests were made on 189 coupon specimens of 0.032-inch 24S-T aluminum-alloy sheet and a few supplementary specimens of 0.004-inch sheet. The mean load was zero. The specimens were restrained against lateral buckling by lubricated solid guides described in a previous report on this project. About two-thirds of the 0.032-inch specimens were plain coupons nominally free from stress raisers. The remainder contained a 0.1285-inch drilled hole at the center where the reduced section was 0.5 inch wide" (p. 1).
Date:
November 1944
Creator:
Brueggeman, W. C.; Mayer, M., Jr. & Smith, W. H.
System:
The UNT Digital Library
Axial Fatigue of 10 Airplane Wing-Beam Specimens by the Resonance Method
Note presenting axial fatigue tests made by the resonance method on 10 specimens from airplane wing beams. The specimens contained several types of stress raiser, such as rivets, holes, fittings, splices, reinforcing plates, and so forth. The results show a greater fatigue stress concentration factor for the wing-beam specimens than for drilled coupons machined from the flanges or for parallel strip coupons containing idle rivets.
Date:
December 1944
Creator:
Brueggeman, W. C.; Krupen, P. & Roop, F. C.
System:
The UNT Digital Library
Friction in Pipes at Supersonic and Subsonic Velocities
Note presenting an experimental determination of the apparent friction coefficient for the flow of air through smooth pipes at subsonic and supersonic velocities. In supersonic flow, the results were found to be strongly influenced by the presence of oblique shocks formed at the junction of nozzle and pipe. Results regarding the apparent friction coefficient, subsonic flow, supersonic flow, and comparisons with other investigations are provided.
Date:
January 1945
Creator:
Keenan, Joseph H. & Neumann, Ernest P.
System:
The UNT Digital Library
Analysis of Square Shear Web Above Buckling Load
"A solution of Von Karman's fundamental equations for plates with large deflections is presented for the case of a shear web divided into square panels by reinforcing struts. Numerical solutions are given for struts of infinite rigidity and for struts the weight of which is one-fourth the weight of the sheet. The results are compared with Wagner's diagonal tension theory as extended by Kuhn and by Langhaar. It is found that the diagonal tension theory as developed by Kuhn agrees best with the present paper in the practical range when r=1/4. Kuhn's theory is in especially good agreement for the force in the strut when r=1/4" (p. 1).
Date:
July 1944
Creator:
Levy, Samuel; Fienup, Kenneth L. & Woolley, Ruth M.
System:
The UNT Digital Library
Force and Moment Coefficients for a Thin Airfoil With Flap and Tab in a Form Useful for Stability and Control Calculations
Note presenting the necessary pressure and force coefficients acting on a thin airfoil with a flap and tab in a form suitable for stability calculations in order to design improved control arrangements.
Date:
January 1945
Creator:
White, Roland J. & Klampe, Dean G.
System:
The UNT Digital Library
Bonding Strengths of Adhesives at Normal and Low Temperatures
Note presenting a determination of the bonding strengths of two thermosetting adhesives, liquid Cycleweld C-3 and Ardux 1, to several aircraft materials using shear tests made on lap-joint specimens. The specimens were tested at 25 degrees Celsius and at subfreezing temperatures of approximately -40 degrees Celsius. Results regarding the specimens bonded under clamping pressure, specimens bonded after various surface treatments, specimens of metal bonded to plywood, and specimens of aluminum bonded to magnesium are provided.
Date:
January 1945
Creator:
Axilrod, B. M. & Jirauch, D. H.
System:
The UNT Digital Library
The "Limiting Line" in Mixed Subsonic and Supersonic Flow of Compressible Fluids
"It is well known that the vorticity for any fluid element is constant if the fluid is non-viscous and the change of state of the fluid is isentropic. When a solid body is placed in a uniform stream, the flow far ahead of the body is irrotational. Then if the flow is further assumed to be isentropic, the vorticity will be zero over the whole filed of flow. In other words, the flow is irrotational. For such flow over a solid body, it is shown by Theodorsen that the solid body experiences no resistance" (p. 1).
Date:
November 1944
Creator:
Tsien, Hsue-Shen
System:
The UNT Digital Library
Applicability of Similarity Principles to Structural Models
"A systematic account is given in part I of the use of dimensional analysis in constructing similarity conditions for models and structures. The analysis covers large deflections, buckling, plastic behavior, and materials with nonlinear stress-strain characteristics, as well as the simpler structural problems" (p. 1).
Date:
July 1944
Creator:
Goodier, J. N. & Thomson, W. T.
System:
The UNT Digital Library
The inward bulge type buckling of monocoque cylinders 1: calculation of the effect upon the buckling stress of a compressive force, a nonlinear direct stress distribution, and a shear force
"In the present part I of a series of reports on the inward bulge type buckling of monocoque cylinders the buckling load in combined bending and compression is first derived. Next the reduction in the buckling load because of a nonlinear direct stress distribution is determined. In experiments nonlinearity may result from an inadequate stiffness of the end attachments in actual airplanes from the existence of concentrated loads or cut-outs" (p. 1).
Date:
October 1944
Creator:
Hoff, N. J. & Klein, Bertram
System:
The UNT Digital Library
Plastic Mountings for Aircraft Windshields
Note presenting an investigation of several laminated glass windshields to determine their suitability for use in airplanes with pressurized cabins. The various constructions of the extended portions of the windshields which serve for mounting purposes included plastic alone, plastic and one sheet of glass extended, plastic extension reinforced with an aluminum strip, and plastic extension reinforced with a steel strip. The results indicated that the laminated windshields with plastic-mounting extensions reinforced by aluminum or steel were resistant to creep and bursting at pressures of the order that will be encountered in service.
Date:
May 1944
Creator:
Bradley, Kathryn H. & Axilrod, B. M.
System:
The UNT Digital Library
Simplified Truss Stability Criteria
Report presenting a note in two parts regarding simplified truss stability criteria. The first part covers the development of simplified criteria for the stability of planar pin-jointed trusses against buckling in the plane of the truss. The second part constitutes a report on tests carried out to verify the validity of the criteria developed in part one.
Date:
July 1944
Creator:
Ballhaus, W. F. & Niles, A. S.
System:
The UNT Digital Library
Numerical procedures for the calculation of the stresses in monocoques 1: diffusion of tensile stringer loads in reinforced panels
Report presenting experiments with both curved and flat reinforced sheet models, the longitudinals of which were loaded axially. The stress distribution in longitudinals and sheet was measured with electric strain gages.
Date:
June 1944
Creator:
Hoff, N. J.; Levy, Robert S. & Kempner, Joseph
System:
The UNT Digital Library
The Inward Bulge Type Buckling of Monocoque Cylinders 2: Experimental Investigation of the Buckling in Combined Bending and Compression
This paper is the second part of a series of reports on the inward bulge type buckling of monocoque cylinders. It presents the results of an experimental investigation of buckling in combined bending and compression. In the investigation it was found that the theory developed in part I of the present series predicts the buckling load in combined bending and compression with the same degree of accuracy as the older theory does in pure bending.
Date:
October 1944
Creator:
Hoff, N. J.; Fuchs, S. J. & Cirillo, Adam J.
System:
The UNT Digital Library
Dynamics of the Inlet System of a Four-Stroke Engine
"Tests were run on a single-cylinder and a multicylinder four-stroke engine in order to determine the effect of the dynamics of the inlet system upon indicated mean effective pressure. Tests on the single-cylinder engine were made at various speeds, inlet valve timings, and inlet pipe lengths. These tests indicated that the indicated mean effective pressure could be raised considerably at any one speed by the use of a suitably long inlet pipe" (p. 1).
Date:
1944
Creator:
Boden, R. H. & Schecter, Harry
System:
The UNT Digital Library