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  Partner: UNT Libraries Government Documents Department
 Collection: Technical Report Archive and Image Library
The torsion of members having sections common in aircraft construction

The torsion of members having sections common in aircraft construction

Date: January 1, 1930
Creator: Trayer, George W
Description: Within recent years a great variety of approximate torsion formulas and drafting-room processes have been advocated. In some of these, especially where mathematical considerations are involved, the results are extremely complex and are not generally intelligible to engineers. The principal object of this investigation was to determine by experiment and theoretical investigation how accurate the more common of these formulas are and on what assumptions they are founded and, if none of the proposed methods proved to be reasonable accurate in practice, to produce simple, practical formulas from reasonably correct assumptions, backed by experiment. A second object was to collect in readily accessible form the most useful of known results for the more common sections. Formulas for all the important solid sections that have yielded to mathematical treatment are listed. Then follows a discussion of the torsion of tubular rods with formulas both rigorous and approximate.
Contributing Partner: UNT Libraries Government Documents Department
Torsion of wing trusses at diving speeds

Torsion of wing trusses at diving speeds

Date: January 1, 1921
Creator: Miller, Roy G
Description: The purpose of this report is to indicate what effect the distortion of a typical loaded wing truss will have upon the load distribution. The case of high angle of incidence may be dismissed immediately from consideration as the loads on the front and rear trusses are balanced, and consequently there will be little angular distortion. A given angular distortion will have the maximum effect upon load distribution in the region of the angle of no-lift, because the slope of the lift curve is highest here, and it is here that the greatest angular distortion will occur, because the load on the front truss acts downward while the load on the rear truss acts upward.
Contributing Partner: UNT Libraries Government Documents Department
Torsion test to failure of a monocoque box

Torsion test to failure of a monocoque box

Date: October 1, 1944
Creator: Mcpherson, A E
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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
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
Torsion tests of a monocoque box

Torsion tests of a monocoque box

Date: November 1, 1942
Creator: Levy, Samuel
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Torsion tests of aluminum-alloy stiffened circular cylinders

Torsion tests of aluminum-alloy stiffened circular cylinders

Date: November 1, 1952
Creator: Clark, J W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Torsion tests of stiffened circular cylinders

Torsion tests of stiffened circular cylinders

Date: May 1, 1944
Creator: Moore, R L
Description: The design of curved sheet panels to resist shear involves a consideration of several factors: the buckling resistance of the sheet, the stress at which buckling becomes permanent, and the strength which may be developed beyond the buckling limit by tension-field action. Although some experimental as well as theoretical work has been done on the buckling and tension-field phases of this problem, neither of these types of action appears to be very well understood. The problem is of sufficient importance from the standpoint of aircraft design, it is believed, to warrant further experimental investigation. This report presents the results of the first series of torsion tests of stiffened circular cylinders to be completed in connection with this study at Aluminum Research Laboratories. (author).
Contributing Partner: UNT Libraries Government Documents Department
Torsion tests of tubes

Torsion tests of tubes

Date: January 1, 1937
Creator: Stang, Ambrose H
Description: This report presents the results of tests of 63 chromium-molybdenum steel tubes and 102 17st aluminum-alloy tubes of various sizes and lengths made to study the dependence of the torsional strength on both the dimensions of the tube and the physical properties of the tube material. Three types of failure are found to be important for sizes of tubes frequently used in aircraft construction: (1) failure by plastic shear, in which the tube material reached its yield strength before the critical torque was reached; (2) failure by elastic two-lobe buckling, which depended only on the elastic properties of the tube material and the dimensions of the tube; and (3) failure by a combination of (1) and (2) that is, by buckling taking place after some yielding of the tube material.
Contributing Partner: UNT Libraries Government Documents Department
The Torsional and Bending Deflection of Full-Scale Aluminum-Alloy Propeller Blades under Normal Operating Conditions

The Torsional and Bending Deflection of Full-Scale Aluminum-Alloy Propeller Blades under Normal Operating Conditions

Date: January 1, 1938
Creator: Hartman, Edwin P
Description: The torsional deflection of the blades of three full-scale aluminum-alloy propellers operating under various loading conditions was measured by a light-beam method. Angular bending deflections were also obtained as an incidental part of the study. The deflection measurements showed that the usual present-day type of propeller blades twisted but a negligible amount under ordinary flight conditions. A maximum deflection of about 1/10 degree was found at a v/nd of 0.3 and a smaller deflection at higher values of v/nd for the station at 0.70 radius. These deflections are much smaller than would be expected from earlier tests, but the light-beam method is considered to be much more accurate than the direct-reading-transit method used in the previous test.
Contributing Partner: UNT Libraries Government Documents Department
The Torsional and Bending Deflection of Full-Scale Duralumin Propeller Blades under Normal Operating Conditions, Special Report

The Torsional and Bending Deflection of Full-Scale Duralumin Propeller Blades under Normal Operating Conditions, Special Report

Date: March 1, 1938
Creator: Hartman, Edwin P.
Description: The torsional deflection of the blades of three full-scale duralumin propellers operating under various loading conditions was measured by a light-beam method. Angular bending deflections were also obtained as an incidental part of the study. The deflection measurements showed that the usual present-day type of propeller blades twisted but a negligible amount under ordinary flight conditions. A maximum deflection of about 1/10th of a degree was found at V/nD of 0.3 and a smaller deflection at higher values of V/nD for the station at 0.70 radius. These deflections are much smaller than would be expected from earlier tests, but the light-beam method is considered to be much more accurate than the direct-reading transit method used in the previous tests.
Contributing Partner: UNT Libraries Government Documents Department