Effect Of Small Deviations From Flatness On Effective Width And Buckling Of Plates In Compression
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Effect of Small Deviations from Flatness on Effective Width and Buckling of Plates in Compression
(3) The Southwell plot method of predicting theoretical critical stresses for perfect specimens from experimental observations on actual specimens may not be expected to give, in general, satisfactory results when applied to flat plates.
Effective Widths of Compression-loaded Plates with a Cutout
A study of the effects of cutouts and laminate construction on the prebuckling and initial postbuckling stiffnesses, and the effective widths of compression-loaded, laminated-composite and aluminum square plates is presented. The effective-width concept is extended to plates with cutouts, and experimental and nonlinear finite-element analysis results are presented. Behavioral trends are compared for seven plate families and for cutout-diameter-to-plate-width ratios up to 0.66. A general compact design curve that can be used to present and compare the effective widths for a wide range of laminate constructions is also presented. A discussion of how the results can be used and extended to include certain types of damage, cracks, and other structural discontinuities or details is given. Several behavioral trends are described that initially appear to be nonintuitive. The results demonstrate a complex interaction between cutout size and plate orthotropy that affects the axial stiffness and effective width of a plate subjected to compression loads.