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  • 1
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    A Study of the Compressive Strength of Stiffened Plywood Panels (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-02
    Description: The results of compression tests on 44 stiffened plywood panels are presented and correlated in groups for the three types of failure observed: column failure, failure by separation of plywood from stiffener, and crushing failure. The expanded program of military aircraft construction has made it necessary to seek substitute materials that can be used in aircraft in place of aluminum alloys. Wood is one of these substitute materials. The development of synthetic resins as bonding and impregnating agents has resulted in the production of plywood which is being used in stressed-skin structures for aircraft. The use of plywood in such structures necessitates that tests be performed. to determine allowable stress values for use in design, This report presents a preliminary analysis of the results of compression tests on 44 stiffened plywood panels made by the Universal Moulded Products Corporation. The tests were made in a testing machine of 1,200,000 pounds capacity in the NACA structures research laboratory.
    Keywords: Aircraft Design, Testing and Performance; Structural Mechanics
    Format: application/pdf
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  • 2
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    Column and Plate Compressive Strengths of Aircraft Structural Materials: 24S-T Aluminum-alloy Sheet (1945)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Type: NACA-WR-L-190 , NACA-ARR-L5F01
    Format: application/pdf
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  • 3
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    Strength Tests of Thin-Walled Duralumin Cylinders in Compression (1934)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This report is the second of a series presenting the results of strength tests of thin-walled duralumin cylinders and truncated cones of circular and elliptic section. It contains the results obtained from compression tests on 45 thin-walled duralumin cylinders of circular section with ends clamped to rigid bulkheads. In addition to the tests on duralumin cylinders, there are included the results of numerous tests on rubber, celluloid, steel, and brass cylinders obtained from various sources.
    Type: NACA-TR-473
    Format: application/pdf
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  • 4
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    A theory for primary failure of straight centrally loaded columns (1938)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A theory of primary failure of straight centrally loaded columns is presented. It is assumed that the column cross section and the load are constant throughout the length.
    Type: NACA-TR-582
    Format: application/pdf
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  • 5
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    A study of general instability of box beams with truss-type ribs (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The design of truss-type ribs for box beams is theoretically treated with regard to the function of the ribs in stabilizing the compression flange. The theory is applied to a design problem, and the results of this application are presented and discussed in relation to the general problem of rib design. The results of some tests made as a part of this general study are presented in an appendix.
    Type: NACA-TN-866
    Format: application/pdf
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  • 6
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    A method for determining the column curve from tests of columns with equal restraints against rotation on the ends (1943)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results are presented of a theoretical study for the determination of the column curve from tests of column specimens having ends equally restrained against rotation. The theory of this problem is studied and a curve is shown relating the fixity coefficient c to the critical load, the length of the column, and the magnitude of the elastic restraint. A method of using this curve for the determination of the column curve for columns with pin ends from tests of columns with elastically restrained ends is presented. The results of the method as applied to a series of tests on thin-strip columns of stainless steel are also given.
    Type: NACA-TN-903
    Format: application/pdf
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  • 7
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    The Critical Compression Load for a Universal Testing Machine When the Specimen Is Loaded Through Knife Edges (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of a theoretical and experimental investigation to determine the critical compression load for a universal testing machine are presented for specimens loaded through knife edges. The critical load for the testing machine is the load at which one of the loading heads becomes laterally instable in relation to the other. For very short specimens the critical load was found to be less than the rated capacity given by the manufacturer for the machine. A load-length diagram is proposed for defining the safe limits of the test region for the machine. Although this report is particularly concerned with a universal testing machine of a certain type, the basic theory which led to the derivation of the general equation for the critical load, P (sub cr) = alpha L can be applied to any testing machine operated in compression where the specimen is loaded through knife edges. In this equation, L is the length of the specimen between knife edges and alpha is the force necessary to displace the upper end of the specimen unit horizontal distance relative to the lower end of the specimen in a direction normal to the knife edges through which the specimen is loaded.
    Type: NACA-TN-860
    Format: application/pdf
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  • 8
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    Strength tests of thin-walled elliptic duralumin cylinders in pure bending and in combined pure bending and torsion (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analysis is presented of the results of tests made by the Massachusetts Institute of Technology and by the National Advisory Committee for Aeronautics on an investigation of the strength of thin-walled circular and elliptic cylinders in pure bending and in combined torsion and bending. In each of the loading conditions, the bending moments were applied in the plane of the major axis of the ellipse.
    Type: NACA-TN-851
    Format: application/pdf
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  • 9
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    Local instability of centrally loaded columns of channel section and Z-section (1939)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Charts are presented for the coefficients in formulas for the critical compressive stress at which cross-sectional distortion begins in a thin-wall member with either a channel section or a Z-section with identical flanges. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the charts. The deflection equations were carefully selected to give good accuracy. The calculation of the critical compressive stress at stresses beyond the elastic range is briefly discussed. In order to demonstrate the use of the formulas and the charts in engineering calculations, two illustrative problems are included.
    Type: NACA-TN-722
    Format: application/pdf
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  • 10
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    Local instability of columns with I-, Z-, channel, and rectangular-tube sections (1939)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Charts are presented for the coefficients in the formulas for the critical compressive stress at which cross-sectional distortion begins in thin-wall columns of I-, Z-, channel, and rectangular-tube sections. The energy method of Timoshenko was used in the theoretical calculations required for the construction of the charts. The deflection equations were carefully selected to give good accuracy. The calculation of the critical compressive stress at stresses above the elastic range is briefly discussed in order to demonstrate the use of the formulas and the charts in engineering calculations. Two illustrative problems are included.
    Type: NACA-TN-743
    Format: application/pdf
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