This paper extends the Moon-Pao theoretical treatment of the buckling of a rectangular beam of infinite length l and infinite width w to the case (a) l infinite, w finite, and the case (b) l finite, w infinite. Then an approximate formulation is used to obtain a lower bound to the critical buckling field for the case (c) l finite, w finite. It is concluded that finite specimen size alone cannot account for the discrepancy between the Moon-Pao theory and experiments.

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