Strain Energy Analysis of Swept Boxes with Ribs Normal to the Spars

Strain Energy Analysis of Swept Boxes with Ribs Normal to the Spars

Howe, D.

College of Aeronautics Cranfield

1953-05-31

The root constraint problem associated with iiniform rectangular swept boxes, having ribs normal to the spars is considered. A strain energy method using self-equilibrating internal end load systems is used. Solutions are presented for the cases of a single cell box having either all ribs rigid, or the root rib flexible. In addition, a consideration is made of second order effects combined with a flexible root rib. The case of a box having two equal cells, with all ribs rigid and a built in root is investigated, and the method of dealing with special root connections in this case is Indicated. The effect of the flexibility of the root rib in the two cell box is also considered. In all cases, the boxes are analysed for loading by a torsion couple, and a normal force applied on the centreline at the tip. The basic theory apertaining to this method of solution, together with the equivalent unswept solutions, are given in appendices. 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 63

Aerospace Engineering Reports

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(c) 1953 College of Aeronautics Cranfield