Stresses Around Rectangular Cut-Outs in Skin-Stringer Panels Under Axial Loads-II (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from Stresses Around Rectangular Cut-Outs in Skin-Stringer Panels Under Axial Loads-II

Skin-stringer panels, although simpler than complete shells, are highly indeterminate structures. In order to reduce the labor of analyzing such panels, simplifying assumptions and special devices may be introduced. The most important device of this nature used in references 1 and 2 is a reduction of the number of stringers, which is effected by combining a number of stringers into a sub stitute single stringer. In reference 2, this reduction was carried to the extreme of using only two substitute stringers, one for the cut stringers and one for the uncut stringers, to represent one quadrant of the panel with a cut-out. The two-stringer structure can be analyzed very rapidly but, being somewhat over-simplified, cannot give an entirely satisfactory picture. In particular, the two stringer structure does not include the region of the net section; and consequently this structure neither shows the effect of length of cut-out nor gives a solution for the maximum stringer stresses. These maximum stresses must be obtained by separate assumptions. In addition, there is no obvious relation between the shear stresses in the actual structure and the shear stresses in the substitute two-stringer structure as used in reference 2.

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