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Creep of 2S-O Aluminum Sheet at 500 and 550 C

Description: Abstract: "Creep and creep-rupture tests were made on 25-O aluminum sheet at temperatures of 500 and 550 C. The estimated stresses that will produce 0.5 per cent deformation and rupture in 10,000 hours at 400, 450, 500, and 550 C (data at 400 and 450 C are from BMI-T-29, dated June 9, 1950) are presented."
Date: September 11, 1952
Creator: VanEcho, J. A.; Simmons, W. F. & Cross, H. C.
Partner: UNT Libraries Government Documents Department

Bearing tests of 14S sheet and plate

Description: From Summary: "Tests were made to determine bearing yield and ultimate strengths of bare and Alclad 15S-W(exp 1) and 14S-T(exp 1) sheet and plate in thicknesses of 0.064 inch, 0.250 inch, and 0.750 inch. From the results of these tests it was concluded that the ratios of bearing to tensile properties from the with-grain direction were essentially the same as proposed in NACA TN Nos. 901, 920, 974, and 981 for other high-strength aluminum-alloy sheet and plate."
Date: August 1948
Creator: Moore, R. L.
Partner: UNT Libraries Government Documents Department

Torsion tests of 24S-T aluminum-alloy noncircular bar and tubing

Description: 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.
Partner: UNT Libraries Government Documents Department

Torsional stability of aluminum alloy seamless tubing

Description: Torsion tests were made on 51ST aluminum-alloy seamless tubes having diameter-to-thickness ratios of from 77 to 139 and length-to-diameter ratios of from 1 to 60. The torsional strengths developed in the tubes which failed elastically (all tubes having lengths greater than 2 to 6 times the diameter) were in most cases within 10 percent of the value indicated by the theories of Donnel, Timoshenko, and Sturm, assuming a condition of simply supported ends.
Date: March 1939
Creator: Moore, R. L. & Paul, D. A.
Partner: UNT Libraries Government Documents Department

Torsional strength of aluminum-alloy round tubing

Description: 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.
Partner: UNT Libraries Government Documents Department

An investigation of the effectiveness of stiffeners on shear-resistant plate-girder webs

Description: From Summary: "The results of 60 different tests on 2 aluminum alloy 17S-T plate girders are presented to show the influence of size and spacing of stiffeners upon the buckling characteristics of shear-resistant webs within the elastic range. It is demonstrated that stiffeners increase the stability of a web by retarding the formation subdivided panels. An empirical method of proportioning stiffeners is proposed which recognizes both of these stiffener functions, and comparisons are made with design procedures based upon theoretical considerations of the buckling problem. Also, some experimental data are provided to show the effect of stiffener size and spacing upon ultimate web strengths."
Date: September 1942
Creator: Moore, R. L.
Partner: UNT Libraries Government Documents Department

Bearing strengths of some wrought-aluminum alloys

Description: 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.
Partner: UNT Libraries Government Documents Department

Bearing strengths of some aluminum-alloy rolled and extruded sections

Description: Report presenting testing to determine bearing yield and ultimate strengths for several sizes of rolled and extruded 14S sections and of rolled 24S-T and 75S-T bar. Results regarding the yield strengths, bearing failures, strength values, and ratios of bearing to tensile properties are provided.
Date: September 1948
Creator: Moore, R. L.
Partner: UNT Libraries Government Documents Department

Bearing strengths of bare and alclad XA75S-T and 24S-T81 aluminum alloy sheet

Description: From Introduction: "A report was recently issued covering an investigation of the bearing properties of the wrought aluminum alloys commonly used in aircraft construction (reference 1). Since this work was undertaken, two new materials, XA75S-T and 24S-T81, have been developed to the commercial stage for aircraft use. The objection of this investigation was to determine the bearing yield and ultimate strengths of these new materials in the form of bare and alclad sheet."
Date: December 1943
Creator: Moore, R. L. & Wescoat, C.
Partner: UNT Libraries Government Documents Department

Observations on the behavior of some noncircular aluminum alloy sections loaded to failure in torsion

Description: Report presenting an investigation of the strength and stiffness characteristics of noncircular aluminum alloy sections loaded to failure in torsion. Results regarding torque-twist and torque-stress curves and stress-distribution diagrams are provided.
Date: February 1947
Creator: Moore, R. L.
Partner: UNT Libraries Government Documents Department

Compressive strength of corrugated-sheet-stiffened panels for consolidated XB-36 airplane

Description: From Summary: "Compression tests were made of 63 panels stiffened with corrugated sheet. The specimens were constructed from artificially aged alclad 24S-T aluminum alloy with minimum guaranteed yield strengths of 57 and 48 kips per square inch for the flat- and corrugated-sheet materials, respectively. Results of the tests are presented in charts which show the average stresses at the maximum load and at buckling of the sheet."
Date: January 1944
Creator: Weinberger, Robert A.; Sperry, William C. & Dobrowski, Charles V.
Partner: UNT Libraries Government Documents Department

Experimental investigation of notch-size effects on rotating-beam fatigue behavior of 75S-T6 aluminum alloy

Description: Report presenting an investigation to study the influence of size, particularly notch-size effect, on extruded 75S-T6 aluminum-alloy test specimens under rotating bending. Results regarding fatigue strength and fatigue-notch factor are provided.
Date: November 1954
Creator: Hyler, W. S.; Lewis, R. A. & Grover, H. J.
Partner: UNT Libraries Government Documents Department

A study of elastic and plastic stress concentration factors due to notches and fillets in flat plates

Description: Six large 24s-t3 aluminum-alloy-sheet specimens containing various notches or fillets were tested in tension to determine their stress concentration factors in both the elastic and plastic ranges. The elastic stress concentration factors were found to be slightly higher than those calculated by Neuber's method and those obtained photoelastically by Frocht. The results showed further that the stress concentration factor decreases as strains at the discontinuity enter the plastic range. A generalization of Stowell's relation for the plastic stress concentration factor at a circular hole in an infinite plate was applied to the specimen shapes tested and gave good agreement with test results.
Date: September 7, 1951
Creator: Hardrath, Herbert F. & Ohman, Lachlan
Partner: UNT Libraries Government Documents Department

Compression tests of some 17S-T aluminum-alloy specimens of I cross section

Description: Report presenting testing of specimens cut from a specially extruded I-beam of 17S-T aluminum alloy with one flange wider than the other under axial compression. Only the two longest specimens failed as columns, while the shorter ones failed by local buckling. The agreement between experimental and calculated values of critical stress can be improved by considering the effect of restraint at the loaded edges of the web and adopting a more accurate buckling treatment beyond the elastic range.
Date: March 1941
Creator: Hill, H. N.
Partner: UNT Libraries Government Documents Department

A phenomenological theory for the transient creep of metals at elevated temperatures

Description: Report presenting a modification of a theory for the behavior of metals at elevated temperatures to yield transient creep curves by assuming that the metal consists of two phases, each with its own elasticity and viscosity. The comparison between theoretical curves obtained with experimental data on pure aluminum, gamma iron, lead, and 7075-T6 aluminum alloy shows that the theory is adequate to account for the shape and position of the experimental curves.
Date: September 1958
Creator: Stowell, Elbridge Z.
Partner: UNT Libraries Government Documents Department

Plastic buckling of extruded composite sections in compression

Description: From Summary: "The theory of plastic buckling, originally derived for individual plates, has been extended to apply to combinations of plates such as H- and Z-sections. The theory has been applied specifically to extruded H-sections of 75S-T6 aluminum alloy; the calculated buckling stresses agree satisfactorily with the stresses obtained experimentally."
Date: October 1949
Creator: Stowell, Elbridge Z. & Pride, Richard A.
Partner: UNT Libraries Government Documents Department

The effect of surface finish on the fatigue performance of certain propeller materials

Description: Report presenting an investigation of the effect of various surface finishes on the endurance of normalized X4130 and 4140 steels and 25S-T aluminum alloy. All mechanically formed surfaces tested were stronger than electropolished surfaces.
Date: December 1943
Creator: Russell, H. W.; Gillett, H. W.; Jackson, L. R. & Foley, G. M.
Partner: UNT Libraries Government Documents Department

Tests of flat panels with four types of stiffeners

Description: 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.
Partner: UNT Libraries Government Documents Department

On the angular distribution of slip lines in polycrystalline aluminum alloy

Description: Report presenting a wide distribution in the angular orientation of slip lines, which is generally observed in various grains of a metal subjected to plastic deformation. Results regarding a comparison of theoretical and experimental results and consequences of the present investigation relative to the slip theory of plasticity are provided.
Date: December 1951
Creator: Hedgepeth, John M.; Batdorf, S. B. & Sanders, J. Lyell, Jr.
Partner: UNT Libraries Government Documents Department

Static strength of aluminum-alloy specimens containing fatigue cracks

Description: Report presenting fatigue testing of seven configurations of specimens made of 2024 and 7075 aluminum alloys in rolled and extruded form and subjected to repeated axial loads until fatigue cracks of various lengths were formed. Small cracks were found to result in disproportionately large reductions of static strength.
Date: October 1956
Creator: McEvily, Arthur J., Jr.; Illg, Walter & Hardrath, Herbert F.
Partner: UNT Libraries Government Documents Department

A review of information on the mechanical properties of aluminum alloys at low temperatures

Description: Report presenting the available sources of data on the mechanical properties of aluminum alloys at low temperatures and a summary of the material to be found in each source. General conclusions regarding commercially available aluminum alloys are also provided.
Date: May 1950
Creator: Bogardus, K. O.; Stickley, G. W. & Howell, F. M.
Partner: UNT Libraries Government Documents Department

Fatigue strengths of aircraft materials : axial-load fatigue tests on notched sheet specimens of 24S-T3 and 75S-T6 aluminum alloys and of SAE 4130 steel with stress-concentration factor of 1.5

Description: Report presenting results of axial-load fatigue tests on notched specimens of three sheet materials: 24S-T3 and 75S-T6 aluminum alloys and normalized SAE 4130 steel. Tests were run at four levels of nominal mean stress.
Date: February 1952
Creator: Grover, H. J.; Hyler, W. S. & Jackson, L. R.
Partner: UNT Libraries Government Documents Department

Fatigue strengths of aircraft materials: axial-load fatigue tests on notched sheet specimens of 24S-T3 and 75S-T6 aluminum alloys and of SAE 4130 steel with stress-concentration factor of 5.0

Description: From Summary: "This reports presents of axial-load fatigue tests on notched specimens of three sheet materials: 24S-T3 and 75S-T6 aluminum alloys and normalized SAE 4130 steel. Each specimen was notched by edge notches designed to have a theoretical stress-concentration factor of 5.0. Tests were run at four levels of nominal mean, stress: 0, 10,000, 20,000, and 30,000 psi. Results of these tests extend information previously reported from tests on unnotched specimens and on specimens less severely notched."
Date: June 1951
Creator: Grover, H. J.; Bishop, S. M. & Jackson, L. R.
Partner: UNT Libraries Government Documents Department

Aluminum-zinc-magnesium-copper casting alloys

Description: From Introduction: "This paper contains data on the mechanical properties of sand-cast test bars having a considerable range in zinc, magnesium, and copper content and more detailed data on the properties and foundry characteristics of an aluminum-zinc-magnesium-copper alloy having a preferred composition for high strength and ductility."
Date: July 1941
Creator: Kempf, L. W.
Partner: UNT Libraries Government Documents Department