Post-Buckling of Axially Compressed Plates

by Archibald N. Sherbourne, Prof. of Civ. Engrg. and Dean; Fac. of Engrg., Univ. of Waterloo, Ontario, Canada,
Robert M. Korol, Asst. Prof.; Dept. of Civ. Engrg. and Engrg. Mech., McMaster Univ., Hamilton, Ontario, Canada,

Serial Information: Journal of the Structural Division, 1972, Vol. 98, Issue 10, Pg. 2223-2234

Document Type: Journal Paper


Aluminum square tubular sections subjected to axial compression generally exhibit a significant reserve of strength above the critical stress levels associated with plate buckling. Load-transverse deflection curves averaged over the four faces of each of six specimens with different slenderness ratios B (width to thickness) validates the nature of behavior predicted in an earlier paper. Membrane action for slender plates (60.8 ≤ B ≤ 106) dominates behavior in the vicinity of the critical load so as to elevate the rate of resistance to load with deflection. Elastic-plastic behavior with its attendant deterioration of stiffness begins to predominate prior to the attainment of the ultimate load resulting in a plastic mechanism at large displacements. Stiff plates (30.8 ≤ B ≤ 45.5) reach ultimate load without the characteristic membrane response and immediately tend to follow a mechanism unloading line.

Subject Headings: Critical loads | Ultimate loads | Displacement (mechanics) | Post buckling | Compression | Plates | Membranes | Aluminum (material)

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