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  Partner: UNT Libraries Government Documents Department
 Decade: 1940-1949
 Year: 1943
 Serial/Series Title: NACA Technical Notes
 Collection: Technical Report Archive and Image Library
Adaptor for measuring principal strains with Tuckerman strain gage

Adaptor for measuring principal strains with Tuckerman strain gage

Date: January 1, 1943
Creator: Mcpherson, A E
Description: An adapter is described which uses three Tuckerman optical strain gages to measure the displacement of the three vortices of an equilateral triangle along lines 120 degrees apart. These displacements are substituted in well-known equations in order to compute the magnitude and direction of the principal strains. Tests of the adaptor indicate that principal strains over a gage length of 1.42 inch may be measured with a systematic error not exceeding 4 percent and a mean observational error of the order of + or minus 0.000006. The maximum observed error in strain was of the order of 0.00006. The directions of principal strains for unidirectional stress were measured with the adaptor with an average error of the order of 1 degree.
Contributing Partner: UNT Libraries Government Documents Department
Bearing strengths of bare and alclad XA75S-T and 24S-T81 aluminum alloy sheet

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

Date: December 1, 1943
Creator: Moore, R L
Description: None
Contributing Partner: UNT Libraries Government Documents Department
Bearing strengths of some wrought-aluminum alloys

Bearing strengths of some wrought-aluminum alloys

Date: August 1, 1943
Creator: Moore, R L
Description: 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. The object of this investigation was to determine bearing yield and ultimate strengths of the following aluminum alloy products: 17S-T, 24S-T, Alclad 24S-T, 24S-RT, 52S-0, 52S-1/2H, 52S-H, 53S-T, and 61S-T extrusions. Ratios of these bearing properties to tensile properties were also determined.
Contributing Partner: UNT Libraries Government Documents Department
Bearing tests of magnesium-alloy sheet

Bearing tests of magnesium-alloy sheet

Date: June 1, 1943
Creator: Sharp, W H
Description: Bearing tests of AM-3S, AM-52S, and AM-C57S magnesium-alloy sheet in various thicknesses and tempers were made. Bearing yield and ultimate strengths were determined and compared for various edge distances and for various ratios of loading-pin diameter to sheet thickness. Tensile strengths were determined and ratios of average bearing yield and ultimate strength to tensile strength are given. The results of the tests indicated that ultimate bearing strengths increased with edge distances up to 1.5 to 2 times the diameter of the loading pin; that ultimate bearing strengths are a function of the ratio of pin diameter to sheet thickness; and that these properties are effected only slightly by increases in edge distance greater than 1.5 diameters.
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
Description of stress-strain curves by three parameters

Description of stress-strain curves by three parameters

Date: July 1, 1943
Creator: Ramberg, Walter
Description: 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. The formula does not describe the behavior of alclad sheet, which shows a marked change in slope at low stress. It seems probable that more than three parameters will be necessary to represent such stress-strain curves adequately.
Contributing Partner: UNT Libraries Government Documents Department
Effect of fillers and of mixing procedure on the strength of plastic materials

Effect of fillers and of mixing procedure on the strength of plastic materials

Date: January 1, 1943
Creator: Kynoch, William
Description: None
Contributing Partner: UNT Libraries Government Documents Department
The effect of inlet-valve design, size, and lift on the air capacity and output of a four-stroke engine

The effect of inlet-valve design, size, and lift on the air capacity and output of a four-stroke engine

Date: November 1, 1943
Creator: Livengood, James C
Description: None
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
The effect of surface finish on the fatigue performance of certain propeller materials

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

Date: December 1, 1943
Creator: Russell, H W
Description: None
Contributing Partner: UNT Libraries Government Documents Department
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