Analysis of experiments on swept wing structures

Analysis of experiments on swept wing structures

Howe, D.

College of Aeronautics Cranfield

1953-05-31

This report is concerned with the application of various theories to the solution of problems investigated experimentally, and in some cases theoretically, by others at the College of Aeronautics. The following work is considered: -A single cell swept wing with ribs normal to the spars, a strain energy solution, allowing for a flexible root rib and shear lag, being applied. The shear lag correction is found to be desirable. - A two cell swept wing, with ribs normal to the spars, again using a strain energy solution. The theory was found to be in good agreement with the experiment, and the root effects were found to be limited to approximately within one root chord length along the rear spar. - A two cell swept wing with ribs parallel to the line of flight, where oblique coordinate theory is used. The Z wise force theory overestimates the cross sectional variation of direct strain in a tapered box, and a pure couple theory gives better results in this case. - A single cell swept box, having oblique ribs, where oblique coordinate theory is found to give good results away from the root. At the root a correction for shear lag is found to be necessary. - A comparison of wings with ribs normal to the spars and parallel to the line of flight is made. It is concluded that the latter is at an advantage in most cases. The College of Aeronautics was founded in 1946 and was granted university status in 1969 becoming the Cranfield Institute of Technology. In 1993 it changed its name to Cranfield University.

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College of Aeronautics Cranfield

College of Aeronautics Report 65

Aerospace Engineering Reports

report

(c) 1953 College of Aeronautics Cranfield