You limited your search to:

  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
Results 15251 - 15274 of 18,906
  |   |  
Torsion tests of 24S-T aluminum-alloy noncircular bar and tubing

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

Date: January 1, 1943
Creator: Moore, R L & Paul, D A
Description: 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.
Contributing Partner: UNT Libraries Government Documents Department
Summary of results of tests made by aluminum research laboratories of spot-welded joints and structural elements

Summary of results of tests made by aluminum research laboratories of spot-welded joints and structural elements

Date: November 1, 1942
Creator: HARTMANN E C & Stickley, G W
Description: Available information concerning spot welding as a means of joining aluminum-alloy parts has been summarized and comparisons have been made of the relative merits of spot-welded and riveted aluminum-alloy structural elements. The results indicated that spot welding was as satisfactory as riveting insofar as resistance to static loads is concerned. Spot welds showed slightly lower resistance to impact loads but definitely lower resistance to repeated loads than rivets.
Contributing Partner: UNT Libraries Government Documents Department
A preliminary investigation of the electrical structure of thunderstorms

A preliminary investigation of the electrical structure of thunderstorms

Date: July 1, 1942
Creator: Workman, E J & Holzer, R E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effects of prior fatigue-stressing of the impact resistance of chromium-molybdenum aircraft steel

Effects of prior fatigue-stressing of the impact resistance of chromium-molybdenum aircraft steel

Date: March 1, 1943
Creator: Kies, J A & Holshouser, W L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effect of rivet and spot-weld spacing on the strength of axially loaded sheet-stringer panels

Effect of rivet and spot-weld spacing on the strength of axially loaded sheet-stringer panels

Date: August 1, 1942
Creator: Ramberg, Walter; Levy, Samuel & Mcpherson, Albert E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Ovalization of tubes under bending and compression

Ovalization of tubes under bending and compression

Date: March 1, 1944
Creator: Demer, L J & Kavanaugh, E S
Description: An empirical equation has been developed that gives the approximate amount of ovalization for tubes under bending loads. Tests were made on tubes in the d/t range from 6 to 14, the latter d/t ratio being in the normal landing gear range. Within the range of the series of tests conducted, the increase in ovalization due to a compression load in combination with a bending load was very small. The bending load, being the principal factor in producing the ovalization, is a rather complex function of the bending moment, d/t ratio, cantilever length, and distance between opposite bearing faces. (author).
Contributing Partner: UNT Libraries Government Documents Department
Curing of resin-wood combinations by high-frequency heating

Curing of resin-wood combinations by high-frequency heating

Date: December 1, 1942
Creator: Von Hippel, Arthur R & Dietz, A G H
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Torsion tests of a monocoque box

Torsion tests of a monocoque box

Date: November 1, 1942
Creator: Levy, Samuel; Mcpherson, Albert E & Ramberg, Walter
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Torsional stability of aluminum alloy seamless tubing

Torsional stability of aluminum alloy seamless tubing

Date: March 1, 1939
Creator: Moore, R L & Paul, D A
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.
Contributing Partner: UNT Libraries Government Documents Department
Motion of the two-control airplane in rectilinear flight after initial disturbances with introduction of controls following an exponential law

Motion of the two-control airplane in rectilinear flight after initial disturbances with introduction of controls following an exponential law

Date: September 1, 1937
Creator: Klemin, Alexander
Description: An airplane in steady rectilinear flight was assumed to experience an initial disturbance in rolling or yawing velocity. The equations of motion were solved to see if it was possible to hasten recovery of a stable airplane or to secure recovery of an unstable airplane by the application of a single lateral control following an exponential law. The sample computations indicate that, for initial disturbances complex in character, it would be difficult to secure correlation with any type of exponential control. The possibility is visualized that the two-control operation may seriously impair the ability to hasten recovery or counteract instability.
Contributing Partner: UNT Libraries Government Documents Department
Effect of rivet pitch upon the fatigue strength of single-row riveted joints of 0.025- to 0.025-inch 24S-T alclad

Effect of rivet pitch upon the fatigue strength of single-row riveted joints of 0.025- to 0.025-inch 24S-T alclad

Date: July 1, 1943
Creator: Seliger, Victor
Description: S-N curves at the range ratio of 0.2 were experimentally obtained for each of the following values of rivet pitch P as used in a single-row lap joint of 0.025- to 0.025-inch 24S-T alclad with one-eight AN430 round-head rivets: p=0.5, 0.75, 1.0, 1.5. Families of constant rivet pitch curves, which define the fatigue life for specimens studied, were developed. Curves showing the variation of the effective stress concentration factor in fatigue with rivet pitch and maximum load per rivet were also established.
Contributing Partner: UNT Libraries Government Documents Department
Physical properties of synthetic resin materials

Physical properties of synthetic resin materials

Date: March 1, 1939
Creator: Fishbein, Meyer
Description: A study was made to determine the physical properties of synthetic resins having paper, canvas, and linen reinforcements, and of laminated wood impregnated with a resin varnish. The results show that commercial resins have moduli of elasticity that are too low for structural considerations. Nevertheless, there do exist plastics that have favorable mechanical properties and, with further development, it should be possible to produce resin products that compare favorably with the light-metal alloys. The results obtained from tests on Compound 1840, resin-impregnated wood, show that this material can stand on its own merit by virtue of a compressive strength four times that of the natural wood. This increase in compressive strength was accomplished with an increase of density to a value slightly below three times the normal value and corrected one of the most serious defects of the natural product.
Contributing Partner: UNT Libraries Government Documents Department
Stresses and deflections in thin shells and curved plates due to concentrated and variously distributed loading

Stresses and deflections in thin shells and curved plates due to concentrated and variously distributed loading

Date: May 1, 1941
Creator: Roark, Raymond J
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Impact strength and flexural properties of laminated plastics at high and low temperatures

Impact strength and flexural properties of laminated plastics at high and low temperatures

Date: August 1, 1946
Creator: Lamb, J J; Albrecht, Isabelle & Axilrod, B M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Plastic mountings for aircraft windshields

Plastic mountings for aircraft windshields

Date: May 1, 1944
Creator: Bradley, Kathryn H & Axilrod, B M
Description: None
Contributing Partner: UNT Libraries Government Documents Department
A method of determining the equilibrium performance and the stability of an engine equipped with an exhaust turbosupercharger

A method of determining the equilibrium performance and the stability of an engine equipped with an exhaust turbosupercharger

Date: November 1, 1941
Creator: Rea, James Buchanan
Description: The performance of an exhaust turbine driving a supercharger is investigated by means of a sample calculation based on reasonable assumptions for the purpose of determining whether the assumed installation is stable with respect to changes in the mass of gas handled, boost pressure, etc. The arrangement was found to be stable throughout the entire range of operation. The method developed can be generally applied.
Contributing Partner: UNT Libraries Government Documents Department
Design of tools for press-countersinking or dimpling 0.040-inch-thick-24S-T sheet

Design of tools for press-countersinking or dimpling 0.040-inch-thick-24S-T sheet

Date: August 1, 1942
Creator: Templin, R L & Fogwell, J W
Description: A set of dimpling tools was designed for 0.040-inch 24S-T sheet and flush-type rivets 1/8 inch in diameter with 100 degree countersunk heads. The dimples produced under different conditions of pressure, sheet thickness, and drill diameter are presented as cross-sectional photographs magnified 20 times. The most satisfactory values for the dimpling tools were found to be: maximum punch diameter, 0.231 inch; maximum die diameter, 0.223 inch; maximum mandrel diameter, 0.128 inch; dimple angle, 100 degree; punch springback angle, 1 1/2 degree; and die springback angle, 2 degree.
Contributing Partner: UNT Libraries Government Documents Department
Propeller tests to determine the effect of number of blades at two typical solidities

Propeller tests to determine the effect of number of blades at two typical solidities

Date: April 1, 1939
Creator: Lesley, E P
Description: Propellers with equal total blade area, but with different numbers, were tested at Stanford University. The tests show generally that, for equal total blade area, propellers with the larger number of blades absorb the greater power and, provided hubs have equal drag, develop the higher efficiency. It is shown that the differences found are in agreement, qualitatively, with what might be predicted from simple blade-element theory.
Contributing Partner: UNT Libraries Government Documents Department
Properties of some expanded plastics and other low-density materials

Properties of some expanded plastics and other low-density materials

Date: September 1, 1945
Creator: Axilrod, Benjamin M & Koenig, Evelyn
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Performance tests of wire strain gages I : calibration factors in tension

Performance tests of wire strain gages I : calibration factors in tension

Date: November 1, 1944
Creator: Campbell, William R
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Effect of alternately high and low repeated stresses upon the fatigue strength of 25S-T aluminum alloy

Effect of alternately high and low repeated stresses upon the fatigue strength of 25S-T aluminum alloy

Date: January 1, 1941
Creator: Stickley, G W
Description: Fatigue tests were made on one lot of 3/4 inch diameter rolled-and-drawn 25S-T aluminum-alloy rod normal in composition and tensile properties. The specimens were tested at 3500 cycles per second in a rotating-beam fatigue test machine. Tests were made for three ratios (20:1, 50:1, and 200:1) of the number of cycles applied at low stress to the number applied at high stress. In general, failure occurred when the number of cycles at either the low or the high stress approached the ordinary fatigue curve for the material, regardless of the sequence in which the stresses were applied.
Contributing Partner: UNT Libraries Government Documents Department
Effect of variables in welding technique on the strength of direct-current metal-arc-welded joints in aircraft steel I : static tension and bending fatigue tests of joints in SAE 4130 steel sheet

Effect of variables in welding technique on the strength of direct-current metal-arc-welded joints in aircraft steel I : static tension and bending fatigue tests of joints in SAE 4130 steel sheet

Date: July 1, 1947
Creator: Voldrich, C B & Armstrong, E T
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Cyclic stress-strain studies of metals in torsion

Cyclic stress-strain studies of metals in torsion

Date: December 1, 1940
Creator: Paul, D A & Moore, R L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Certain mechanical strength properties of aluminum alloys 25S-T and X76S-T

Certain mechanical strength properties of aluminum alloys 25S-T and X76S-T

Date: October 1, 1943
Creator: Dolan, Thomas J
Description: None
Contributing Partner: UNT Libraries Government Documents Department