Download A correlation study of methods of matrix structural analysis by Richard H Gallagher; Rattinger Ivan.; John S Archer; North PDF

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By Richard H Gallagher; Rattinger Ivan.; John S Archer; North Atlantic Treaty Organization. Advisory Group for Aeronautical Research and Development. Structures and Materials Panel

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Additional resources for A correlation study of methods of matrix structural analysis : report to the 14th Meeting, Paris, France, July 6, 1962

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Probably the first independent extensive evaluation of idealizations proposed for the matrix analysis of multiweb wings was accomplished in Ref. 6; this work has also been summarized in a report to the AGARD Structures and Materials Panel (Ref. 5) and in Ref. 7. A group ôf ten multiweb wing structures, representing an ordered variation of significant geometric parameters, had been tested for deflection influence coefficients. Eight wings were tested specifically for this program; results for the two remaining models were obtained from the literature.

To form axial force members. b. Triangular plate element skins-'shear moment" spars (Fig. 14c). The skins are represented by triangular elements in plane stress. The stresses and strains within an element are constant. Full-depth internal members are represented by "shear moment" spars, which account for shear behavior and the direct stresses due to bending moments. For this idealization, as well as others represented in Fig. 14, stringers, if present, would be idealized as axial force members.

5 serve as the basis for these analyses. The four models are part of the previously noted series fabricated for the purpose of evaluating the effects of significant geometric parameters. Specifically, these parameters are: aspect ratio, sweep angle, relative skin thickness, and nonuniformity in the orientation of internal members. The test-theory comparisons of Ref. e. aspect ratio, sweep, and relative skin thickness, are not properly represented by various proposed idealizations. With this information in hand it has been possible to select only those models which emphasize these critical behaviors.

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