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  • Other Sources  (8)
  • Structural Mechanics  (8)
  • 1940-1944  (8)
  • 1
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    Stress Analysis of Circular Frames (1941)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The stresses in circular frames of constant bending stiffnesses, as encountered in thin-wall shells, are investigated from the point of view of finite depth of sectional area of frame. The solution is carried out for four fundamental load conditions. The method is illustrated on a worked out example.
    Keywords: Structural Mechanics
    Type: NACA-TM-999
    Format: application/pdf
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  • 2
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    Bending of Rectangular Plates with Large Deflections (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The solution of von Karman's fundamental equations for large deflections of plates is presented for the case of a simply supported rectangular plate under combined edge compression and lateral loading. Numerical solutions are given for square plates and for rectangular plates with a width-span ratio of 3:1. The effective widths under edge compression are compared with effective widths according to von Karman, Bengston, Marguerre, and Cox and with experimental results by Ramberg, McPherson, and Levy. The deflections for a square plate under lateral pressure are compared with experimental and theoretical results by Kaiser. It is found that the effective widths agree closely with Marguerre's formula and with the experimentally observed values and that the deflections agree with the experimental results and with Kaiser's work.
    Keywords: Structural Mechanics
    Type: NACA-TN-846
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  • 3
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    Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate (1942)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
    Keywords: Structural Mechanics
    Type: NACA-TR-735
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  • 4
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    Compressive Strength of Flat Panels with Z- and Hat-Section Stiffeners (1944)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Compression tests were conducted on 247 panels with Z-section stiffeners and 304 panels with hat-section stiffeners. Specimens were constructed from artificially aged Alclad 24S aluminum alloy with minimum guaranteed yield strengths of 64 and 57 ksi for stiffeners and sheet materials, respectively. Height, thickness, and spacing of stiffeners, sheet thickness, and length of specimens were varied systematically to show effects of changes in these dimensions on panel strength. Results show average stresses at buckling load and maximum load.
    Keywords: Structural Mechanics
    Type: NACA-WR-L-62 , NACA-ARR-L4F01
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  • 5
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    A Flush-Rivet Milling Tool (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: The investigation of machine-countersunk flush rivets for aircraft described in reference 1 revealed the necessity of having the height of the rivet heads greater than the depth of the countersunk holes if tightly riveted joints were to be obtained. If ordinary roundhead rivets were inserted from the opposite side of the joint and the countersunk heads formed in the driving of the rivets filled the countersunk holes completely, still tighter joints were obtained. In either case the rivets protruded above the skin surface after driving, and the protruding portion of the rivet heads had to be removed in order to obtain flush rivets. A number of requests have been received for a description of the tool used to mill off the protruding portion of the rivet heads. This report contains assembly and detail drawings of the latest flush-rivet milling tool used at the NACA Structures Research Laboratory. Figure 6 shows the tool in operation. This tool is quite satisfactory for 1/8-inch rivets, but a more powerful motor is recommended for use with larger rivets.
    Keywords: Structural Mechanics
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  • 6
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    Data on Compressive Strength of Flat Panels with Z-Section Stiffeners (1942)
    In:  CASI
    Details
    Publication Date: 2018-06-05
    Description: A comprehensive series of compression tests on skin-stiffener panels with Z-section stiffeners formed from flat sheet is being made in order to show the importance of the relative dimensions in determining the strength of the panels. The results obtained to date in this investigation are presented in this report.
    Keywords: Structural Mechanics
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  • 7
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    Restraint Provided a Flat Rectangular Plate by a Sturdy Stiffener Along an Edge of the Plate, Special Report (1941)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A sturdy stiffener is defined as a stiffener of such proportions that it does not suffer cross-sectional distortion when moments are applied to some part of the cross section. When such a stiffener is attached to one edge of a plate, it will resist rotation of that edge of the plate by means of its torsional properties. A formula is given for the restraint coefficient provided the plate by such a stiffener. This coefficient is required for the calculation of the critical compressive stress of the plate.
    Keywords: Structural Mechanics
    Type: NACA-SR-190
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  • 8
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    The Effect of Initial Displacement of the Center Support on the Buckling of a Column Continuous over Three Supports (1940)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The test indicate that "an indiscriminate single application of the Southwell method (for analyzing Exp. Observations in problems of elastic stability)--can result in definite and measurable errors" The test also indicate "that the effect of curvature due to bending on the critical load for the compression flange material of a box beam is probably small and can be neglected." We have not found this to be true in our tests. It is believed that the effect of curvature, together with a small amount of fixity at the ribs, tends to force the stiffeners to bow in each bay thus effectively increasing their end fixity and thereby raising their allowable loads.
    Keywords: Structural Mechanics
    Type: NACA-SR-166
    Format: application/pdf
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