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FACTORS AFFECTING THE DESIGN OF THIN WINGS
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English
Abstract
This paper outlines the scope of the problems encountered in the design of thin wings and presents a simple method of determining the optimum proportions for minimum weight multispar box beams in pure bending. In the development, it is assumed that simultaneous failure of the skin in compression and the web in crushing of a concentric pin-connected multispar constitutes the basis for optimum structure in pure bending. Test results using formed channels with small bend radii indicate that these assumptions closely approximate the behavior and proportions of the optimum structure for straight thin wings.
The general nature of this paper excludes the effects of large bend radii formed channels, attachment size, spacing, and location, and combined loads. These effects are important and must be considered in final analysis.
The results are presented in the form of a design chart for 75S-T6 non-clad material. Similar charts may be constructed for other materials from the general equations and their stress-strain curves.
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Citation
CONWAY, W., "FACTORS AFFECTING THE DESIGN OF THIN WINGS," SAE Technical Paper 540141, 1954, https://doi.org/10.4271/540141.Also In
References
- Gerard George “Comparative Efficiency in Bending of Structural Elements of Various Designs and Solidity,” New York University, College of Engineering April 1952
- Olle Ljungstrom “Wing Structures of Future Aircraft;” Aircraft Engineering May 1953
- Schuette Evan H. McCulloch James C. “Charts for the Minimum-Weight Design of Multiweb Wings in Bending,” NACA TN 1323 June 1947
- Gerard George “Optimum Number of Webs Required for a Multicell Box Under Bending,” Journal of Aero. Sciences January 1948
- Micks W. R. “A Method of Estimating the Compressive Strength of Optimum Sheet-Stiffener Panels for Arbitrary Material Properties, Skin Thickness, and Stiffener Shapes,” Journal of Aero. Sciences October 1953
- Anderson R. A. Pride R. A. Johnson A. E. “Some Information on the Strength of Thick-Skin Wings with Multiweb and Multipost Stabilization,” NACA RM L53F16 August 1953
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- Pride R. A. Anderson M. S. “Experimental Investigation of the Pure-Bending Strength of 75S-T6 Aluminum Alloy Multiweb Beams with Formed-Channel Webs,” NACA TN 3082 March 1954
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- Heilbron C. Sandorff Paul “Preliminary Thin Wing Study for P-80 Airplane,” Lockheed Report 5404, August 1945
- Bleich Friedrich 354
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- Johnson A. E. Buchert K. P. “Critical Combinations of Bending, Shear, and Transverse Compressive Stresses for Buckling of Infinitely Long Flat Plates,” NACA TN 2536 December 1951
- Lockheed Report 9684 “Tests of Channel Supported Box Beams and Compression Panels,” May 1954
- Ramberg W. Osgood W. R. “Description of Stress-Strain Curves by Three Parameters,” NACA TN 902 July 1943