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294
Performance tests of wire strain gages 3: calibrations at high tensile strains
Report presenting results of calibration in axial tension over the strain range 0 to 0.03 are presented for 15 types of single element, multistrand wire strain gages. Considerable nonlinearity was observed at strains between 0.0025 and 0.006. Fifty-eight percent of the gages failed by breaking of the strain-sensitive wire at strains less than 0.03.
Date:
December 1945
Creator:
Campbell, William R.
System:
The UNT Digital Library
The Effect of Temperature on Sheet Metals for Airplane Firewalls
Note presenting tests conducted on 5 uncoated steels and 20 steels with various coatings to determine the effect of temperature on the tensile properties and surface characteristics of the metals. The metals were subjected to furnace-heating tests over a range of temperatures for various times and to flame-impingement and airplane-fire tests. Results regarding metals without surface coatings, low carbon steels with surface coatings, and discussion of comparative behaviors regarding the different surface coatings are provided.
Date:
December 1944
Creator:
Mutchler, Willard
System:
The UNT Digital Library
Column Strength of Extruded Magnesium Alloys AM-C58S and AM-C58S-T5
"Tests have previously been made to determine the column strength of magnesium alloy AM-C58S-T5 extruded rod, but these few data were not considered a satisfactorily wide basis for establishing a general formula for the column strength of this alloy. It was therefore decided to make additional tests on a number of extruded sections of magnesium alloy AM-C58S-T5 with some tests on AM-C58S for comparison" (p. 1).
Date:
December 1945
Creator:
Leary, J. R. & Holt, Marshall
System:
The UNT Digital Library
Data on Material Properties and Panel Compressive Strength of a Plastic-Bonded Material of Glass Cloth and Canvas
Results are presented of tests for determining the tensile, compressive, and bending properties of a material of plastic-bonding glass cloth and canvas layers. In addition, 10 panel specimens were tested in compression. Although the material is not satisfactory for primary structural use in aircraft when compared on a strength-weight basis with other materials in common use, there appears to be potential strength in the material that will require research for development. These points are considered in some detail in the concluding discussion of the report. An appendix shows that a higher tensile strength can be obtained by changes in the type of weave used in the glass-cloth reinforcement.
Date:
December 1944
Creator:
Zender, George W.; Schuette, Evan H. & Weinberger, Robert A.
System:
The UNT Digital Library
Tests of Airfoils Designed to Delay the Compressibility Burble
Note presenting a method of deriving certain airfoil shapes that delay certain compressibility phenomena, and the aerodynamic data for a wide range of Mach numbers obtained from tests of the airfoils in the 24-inch high-speed tunnel. The airfoils, which are designated the NACA 16-series, have increased critical Mach number. Results regarding the airfoil comparison, critical speed, minimum drag, and use of the data are provided.
Date:
December 1944
Creator:
Stack, John
System:
The UNT Digital Library
Development of detonation detector suitable for use in flight
Report presenting an apparatus for making quantitative measurements of the vibrations excited by detonation in the cylinder head of an aircraft engine. The apparatus consisted of pick-up units, an amplifying system, and a cathode-ray oscillograph with a high-speed-camera recording system. A large number of records were taken under various operating conditions in a single-cylinder aircraft engine.
Date:
December 1944
Creator:
Draper, C. S.; Taylor, E. S.; Lancor, J. H. & Coffey, R. T.
System:
The UNT Digital Library