Simply supported edge conditions are considered, for which the buckling modes consist of integer numbers of half sine waves in the two perpendicular directions. This note con siders the usual design case of specified load ratios. The lowest buckling mode in biaxial compression is shown to have a single half wave in an effectively short direction, or in both directions if the plate is effectively nearly square. The tension/compression case has a single half wave in the tension direction. The number of multiple half waves can be ap proximately determined to minimize numerical search computations.
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References
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Wittrick, W.H."Correlation Between Some Stability Problems for Orthotropic and Isotropic Plates Under Biaxial and Uniaxial Direct Stress,"The Aeronautical Quarterly, IV:83-92 (August 1952).
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