W. D. Kroll, Gordon P. Fisher, George J. Heimrel
Charts are presented for the calculation of the critical stress for local instability of columns with I-, Z-, channel, and rectangular-tube sections. These charts are intended to replace the less complete charts published in NACA Technical Note No. 743. The values used in extending the charts are computed by moment-distribution methods that give somewhat more accurate values than the energy method previously used and also make it possible to determine theoretically which element of the cross section is primarily responsible for instability. An experimental curve is included for use in taking into account the effect of stresses above the elastic range on the modulus of elasticity of 24S-T aluminum alloy. A determination of the dimensions of a thin-metal column for maximum critical stress with certain given conditions is presented.
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