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A special fixture developed at Ecole Polytechnique was used to carry out compression tests on strips of sheet material at room and high temperatures up to 1400 F, to determine the stress-strain diagram in compression of annealed and aged Inconel 718 nickel-chromium alloy. Buckling tests at room and high temperatures were also carried out on columns of the same material and of various slenderness ratios, using specially developed pin-ended supports enabling lateral displacement under load of one end of a column; this feature together with a precise centering technique permitted keeping a column well centered during a buckling test. The theoretical relationship between buckling stress and slenderness ratio for columns made of this material was calculated by Euler's formula using the tangent modulus determined from the experimental compression stress-strain diagrams. Experimental buckling stresses of columns were found to agree well with the calculated values. Thus, not only is the experimental relationship established between buckling stress and slenderness ratio for columns of annealed and aged Inconel 718 nickel-chromium alloy, but it is also shown that the buckling behavior of such columns can be accurately predicted from the compression stress-strain diagrams of the material.
Associate Professor of Applied Mechanics, Ecole Polytechnique, Montreal, Canada
Professor of Applied Mechanics, Ecole Polytechnique, Montreal, Canada