Resource Type
Collection
Technical Report Archive and Image Library
416
National Advisory Committee for Aeronautics Collection
334
TRAIL Microcard Collection
45
Office of Scientific & Technical Information Technical Reports
39
Texas State Publications
3
Federal Communications Reports
2
Boy and Girl Scout Annual Reports
1
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1
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NACA Wartime Reports
243
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119
NACA Memorandum Reports
48
NACA Technical Notes
44
Atomic Energy Commission Reports
37
NACA Advanced Confidential Reports
33
NACA Restricted Bulletins
27
NACA Technical Reports
24
United States Bureau of Mines Reports
23
NACA Technical Memorandums
17
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Syllabus of Clay Testing: Part 1
From Introduction: "This presentation (pt. 1) is what might be termed a qualitative syllabus, in that uses only are indicated, no attempt being made to evaluate a clay quantitatively, that is, to grade for particular uses. In part 2, which is to follow, the work will be amplified both qualitatively and quantitatively. In the first, preliminary tests are made to eliminate from consideration all nonclay minerals or clay minerals containing such large amounts of impurities as to render them unfit for normal uses and also to make a broad general classification of the clay minerals into the kaolinite (shales and clays) and montmorillonite groups. In the second step, the main tests, divided into two general headings, ceramic and noncermaic, are detailed."
Date:
1943
Creator:
Klinefelter, Theron A.; O'Meara, Robert G.; Gottlieb, Sidney & Truesdell, Glenn C.
System:
The UNT Digital Library
Quarry Accidents in the United States During the Calendar Year 1941
Report published by the U.S. Bureau of Mines which is a compilation of accidents in quarries located in the United States with data regarding the number and kinds of accidents as well as information about the mining operations (e.g., number of men employed, kinds of quarries, amount of work performed, etc.).
Date:
1943
Creator:
Adams, William W. & Wrenn, Virginia E.
System:
The UNT Digital Library
United States Earthquakes, 1943
Report discussing earthquake activity in the United States during 1943. The report is broken down by regions and has sections for specific earthquakes.
Date:
1943
Creator:
unknown
System:
The UNT Digital Library
Analysis of the High-Altitude Cooling of the Ranger SGV-770 D-4 Engine in the Bell XP-77 Airplane
Report presenting an analysis of the cooling installation in the high-altitude XP-77 airplane for the entire altitude range. The engine was tested with the same cylinders, aluminum fins, and turbulent-flow baffles proposed for the high-altitude SCV-770 engine. The report is incomplete.
Date:
October 1943
Creator:
Nielsen, Jack N. & Schumacher, Lloyd E.
System:
The UNT Digital Library
Tests of Aluminum-Alloy Stiffened-Sheet Specimens Cut From an Airplane Wing
"The specimens used in the present tests were cut from an actual airplane wing of the stressed-skin type. The specimens thus obtained were not representative of the usual type of laboratory specimens because the stiffeners were not exactly parallel nor evenly spaced and, in one case, the skin consisted of pieces of sheet of different thicknesses. The test data obtained indicate that the buckling strain of stiffened curved sheet can be computed with reasonable accuracy by the equation given by Wenzek" (p. 1).
Date:
January 1943
Creator:
Holt, Marshall
System:
The UNT Digital Library
Bearing strengths of some wrought-aluminum alloys
From Introduction: "Although a number of investigations of the bearing strength of aluminum alloys have been made, the problem remains one of considerable interest to the aircraft industry. For this reason it has seemed advisable to make additional tests of the commonly used aircraft alloys in an effort to establish a better basis for the selection of allowable bearing values. Current design practice does not recognize the effect of edge distance upon bearing strengths, and for this reason edge distance was one of the principal variables considered in this investigation. The increasing emphasis being placed upon permanent set limitations makes it essential that more information on bearing yield phenomena be obtained."
Date:
August 1943
Creator:
Moore, R. L. & Wescoat, C.
System:
The UNT Digital Library
Description of Stress-Strain Curves by Three Parameters
"A simple formula is suggested for describing the stress-strain curve in terms of three parameters; namely, Young's modulus and two secant yield strengths. Dimensionless charts are derived from this formula for determining the stress-strain curve, the tangent modulus, and the reduced modulus of a material for which these three parameters are given. Comparison with the tensile and compressive data on aluminum-alloy, stainless-steel, and carbon-steel sheet in NACA Technical Note No. 840 indicates that the formula is adequate for most of these materials" (p. 1).
Date:
July 1943
Creator:
Ramberg, Walter & Osgood, William R.
System:
The UNT Digital Library
Effects of Prior Fatigue-Stressing of the Impact Resistance of Chromium-Molybdenum Aircraft Steel
Note presenting a study of the impact behavior of normalized SAE X4130 steel after a variety of repeated stress treatments. Fatigue specimens of several types were used and the effects of surface finish, rest periods, stress amplitude, mean stress, stress concentration, and temperature during repeated stress received consideration.
Date:
March 1943
Creator:
Kies, J. A. & Holshouser, W. L.
System:
The UNT Digital Library
A method for determining the column curve from tests of columns with equal restraints against rotation on the ends
The results are presented of a theoretical study for the determination of the column curve from tests of column specimens having ends equally restrained against rotation. The theory of this problem is studied and a curve is shown relating the fixity coefficient c to the critical load, the length of the column, and the magnitude of the elastic restraint. A method of using this curve for the determination of the column curve for columns with pin ends from tests of columns with elastically restrained ends is presented. The results of the method as applied to a series of tests on thin-strip columns of stainless steel are also given.
Date:
August 1943
Creator:
Lundquist, Eugene E.; Rossman, Carl A. & Houbolt, John C.
System:
The UNT Digital Library
The Stability of Isotropic or Orthotopic Cylinders or Flat or Curved Panels, Between and Across Stiffeners, With Any Edge Conditions Between Hinged and Fixed, Under Any Combination of Compression and Shear
Note presenting a theory that is meant to include all factors that are commonly present when determining the stability of isotropic or orthotropic cylinders or flat or curved panels under a variety of characteristics. The theory is based on the energy method and involves a number of approximations, some rather rough. It is a theory of elastic stability and, like other theories, assumes a construction with no imperfections of shape or elasticity.
Date:
December 1943
Creator:
Donnell, L. H.
System:
The UNT Digital Library
The effect of the type of specimen on the shear strengths of driven rivets
Report presenting tests of various types of riveted joint composed of 24S-T sheet and 1/8-inch A17S-T rivets in order to determine the effects of specimen type on shear strengths. The results indicated that there was only a slight variation in shear strength with considerable variation in the types of specimen.
Date:
November 1943
Creator:
Sharp, W. H.
System:
The UNT Digital Library
Effect of Fillers and of Mixing Procedure on the Strength of Plastic Materials
Note presenting a study to prepare a series of molding powders with the use of a given plastic and given fillers in varying proportions and to determine the effect of the differences in composition of the molding powders on certain physical properties of standard test pieces molded from them.
Date:
January 1943
Creator:
Kynoch, William & Patronsky, L. A.
System:
The UNT Digital Library
Torsional strength of aluminum-alloy round tubing
Report presenting an analysis of existing data on aluminum-alloy tubing with a wide range of plastic properties in order to establish a useful empirical relationship between tensile yield and ultimate strengths, diameter-thickness ratios, and torsional strengths within the range of plastic buckling.
Date:
January 1943
Creator:
Moore, R. L.
System:
The UNT Digital Library
Tests of flat panels with four types of stiffeners
Report presenting testing of fifty-one aluminum-alloy panels as flat-end columns. The test specimens included all possible combinations of two lengths, four stiffener spacings, and four stiffener designs, and were mostly in duplicate pairs. Results regarding the panel bending tests, panel compression tests, and column tests of individual stiffeners are provided.
Date:
January 1943
Creator:
Niles, Alfred S.
System:
The UNT Digital Library
A portable calibrator for dynamic strain gages
From Summary: "A portable device for calibrating dynamic strain gages is described. The device contains a motor-driven cam, which applies alternating tensile loads to a metal strip 5/8 inch wide and 6 1/4 inches long. The cam is designed to produce a nearly sinusoidal variation of strain with time. Dynamic strain gages with gage lengths up to 5 inches may be calibrated by mounting them on the strip and by changing the frequency and the amplitude of the tensile load. The frequency may be varied from 15 to 30 cycles per second and the strain amplitude from 0 to 10x10-4 in steps of 2x10-4."
Date:
February 1943
Creator:
McPherson, Albert E.
System:
The UNT Digital Library
The Strength of Thin-Wall Cylinders of D Cross Section in Combined Pure Bending and Torsion
"The results of tests of 56 cylinders of D cross section conducted in the Aeronautical Laboratory of the University of Maryland are presented in this report. These cylinders were subjected to pure bending and torsional moments of varying proportions to give the strength under combined loading conditions. The average buckling stress of these cylinders has been related to that of circumscribing circular cylinders for conditions of pure torsion and pure bending and the equation of the interaction curve has been determined for conditions of combined loading" (p. 1).
Date:
September 1943
Creator:
Sherwood, A. W.
System:
The UNT Digital Library
Torsional Elastic Properties of 18:8 Chromium-Nickel Steel as Affected by Plastic Deformation and by Heat Treatment
Note presenting a study made of the relationship between torsional stress, strain, and permanent set for 18:8 chromium-nickel steel in the annealed, half-hard, and hard conditions. The influence of plastic extension, plastic torsion, and annealing temperature on the torsional elastic properties is discussed.
Date:
January 1943
Creator:
Mebs, R. W. & McAdam, D. J., Jr.
System:
The UNT Digital Library
Large-Deflection Theory of Curved Sheet
Equations are given for the elastic behavior of initially curved sheets in which the deflections are not small in comparison with the thickness, but at the same time small enough to justify the use of simplified formulas for curvature. These equations are solved for the case of a sheet with circular cylindrical shape simply supported along two edges parallel to the axis of the generating cylinder. Numerical results are given for three values of the curvature and for three ratios of buckle length to buckle width.
Date:
May 1943
Creator:
Levy, Samuel
System:
The UNT Digital Library
Some Investigations of the General Instability of Stiffened Metal Cylinders 7: Stiffened Metal Cylinders Subjected to Combined Bending and Torsion
"This report summarizes the work that has been carried on in the experimental investigation of the problem of the general instability of stiffened metal cylinders subjected to combined bending and torsion at the C.I.T. This part of the investigation included tests on 26 sheet-covered specimens. An interaction curve for the case of combined bending and torsion is presented. The results of tests of 17 specimens subjected to pure torsion are also given" (p. 1).
Date:
November 1943
Creator:
unknown
System:
The UNT Digital Library
Pressure Distribution on the Fuselage of a Midwing Airplane Model at High Speeds
Report presenting the pressure distribution on the fuselage of a midwing airplane model measured in the 8-foot high-speed wind tunnel at a range of speeds and lift coefficients. The primary purpose of the investigation was to provide data showing the air pressures on various parts of the fuselage for use in structural design.
Date:
February 1943
Creator:
Delano, James B.
System:
The UNT Digital Library
Large-Deflection Theory for End Compression of Long Rectangular Plates Rigidly Clamped Along Two Edges
"The von Karman equations for flat plates are solved beyond the buckling load up to edge strains equal to eight time the buckling strain, for the extreme case of rigid clamping along the edges parallel to the load. Deflections, bending stresses, and membrane stresses are given as a function of end compressive load. The theoretical values of effective width are compared with the values derived for simple support along the edges parallel to the load" (p. 1).
Date:
January 1943
Creator:
Levy, Samuel & Krupen, Philip
System:
The UNT Digital Library
Tensile and Compressive Tests of Magnesium Alloy J-1 Sheet
Note presenting tensile and compressive stress-strain curves, stress-deviation curves, and secant modulus-stress curves for longitudinal and transverse specimens of magnesium alloy J-1 sheets 0.032 and 0.102 inch thick. Significant differences were found between the tensile and compressive stress-strain curves and between the compressive stress-strain curves for the longitudinal and transverse questions.
Date:
December 1943
Creator:
Aitchison, C. S. & Miller, James A.
System:
The UNT Digital Library
Certain Mechanical Strength Properties of Aluminum Alloys 25S-T and X76S-T
Note presenting tests made to determine certain mechanical strength properties of 25S-T aluminum alloy. Results are presented from static tests in tension and torsion, bending fatigue tests employing three different types of testing machines, and from impact tests of notched and unnotched specimens in tension as well as Charpy impact tests made at several low temperatures. These are made in order to study the stresses that propeller blades experience.
Date:
October 1943
Creator:
Dolan, Thomas J.
System:
The UNT Digital Library
Torsion tests of 24S-T aluminum-alloy noncircular bar and tubing
From Summary: "Tests of 24S-T aluminum alloy have been made to determine the yield and ultimate strengths in torsion of noncircular bar and tubing. An approximate basis for predicting these torsional strength characteristics has been indicated. The results show that the torsional stiffness and maximum shearing stresses within the elastic range may be computed quite closely by means of existing formulas based on mathematical analysis and the membrane analogy."
Date:
January 1943
Creator:
Moore, R. L. & Paul, D. A.
System:
The UNT Digital Library