Effect of single circular perforation in lean duplex stainless steel (LDSS) hollow circular stub columns under pure axial compression

This study presents the effect of various geometrical parameters of circular single perforation on the critical/ultimate buckling load of a circular lean duplex stainless steel (LDSS) stub column loaded axially using finite element (FE) software, Abaqus. The effect of eccentricity (distance between the perforation centre and edge of column), hole diameter and column thickness are studied on the critical buckling load capacity. The decrease of buckling load when perforation size (d/D) is increased from 0.02 to 0.20 is found to be 13.9%, 13.5%, 12.0%, 10.1%, 8%, respectively, for perforation eccentricities (e/L) of 0.5, 0.4, 0.3, 0.2 and 0.1, indicating maximum reduction of buckling load when the perforation is located at mid-height (or e/L=0.5). For lower values of d/D (say 0.02), there is no significant effect of perforation on the buckling load for all values of eccentricities considered. With ∼72% increase in thickness (from t=2.75), the buckling load is found to increase by ∼5.0%, 4.2%, 3.2%, 1.2%, 0.3%, 0% for d/D=0.20, 0.12, 0.10, 0.08, 0.04, 0.02, respectively, with the rate of increase higher for higher d/D ratios.