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National Advisory Committee for Aeronautics, Technical Notes - Direct-Reading Design Charts for 24S-T3 Aluminum Alloy Flat Compression Panels Having Longitudinal Formed Hat Section Stiffeners and Comparisons with Panels Having Z-Section Stiffeners

Direct—reading design charts are presented for ZhS-T3 aluminum—
alloy flat compression panels having longitudinal formed hat-section
stiffeners. These charts make possible the direct determination of
the stress and all panel proportions required to carry a given intensity
of loading with a given skin thickness and effective length of panel.

A comparison is made of the relative merits of hat- and Z-stiffened
panels when used for carrying simple compression and when used as the
covers of box beams which are subjected to compression plus bending
and to compression plus bending plus vertical shear.

Design charts for wing compression panels have been presented in
several different forms. (See refs. 1 and 2.) In reference 3, a form
was presented which permitted the direct selection of the various panel
proportions for given values of the principal design_conditions —
intensity of loading, skin thickness, and effective length of panel.
This form also made possible the ready determination of the proportions
having minimum weight to meet these conditions.

In the present paper, similar direct-reading design charts are
presented for 2hS—T3 aluminum-alloy flat compression panels having
longitudinal formed hat- section stiffeners. These charts are based
on the extensive test data of references A to 6. The structural effi—
ciency of the hat—stiffened panel as evidenced by the charts is then
discussed relative to the efficiencies previously found for Z—stiffened
panels both when used for carrying simple compression and when used as
the covers of box beams which are subjected to compression plus bending
and to compression plus bending plus vertical shear.