Instability of Conical Shells with Multiple Dimples under Axial Compression

Abstract

Abstract: Thin-walled conical shells are primary structures in offshore application. Presence of imperfection can considerably reduce the load carrying capacity of such structures when in use. : two perfect, and the remaining six with MPLA imperfection amplitude, A, of 0.56, 1.12 and 1.68 0.91 to 1.13. This study examines the buckling behavior of axially compressed imperfect steel cones using the multiple perturbation load analysis (MPLA). This is both a numerical and experimental study. Eight conical shell test models were manufactured in pairs and collapsed under axial compression having two equally-spaced dimples on each cones. Experimental test results for all the conical shell models and the accompanying numerical predictions are given in this paper. Repeatability of experimental data was good. The errors within each pair were 3%, 13%, 1% and 0%. In addition, there was a good comparison between experimental and numerical data. The ratio of experimental to numerical buckling loads varies from

Buckling of Axially Compressed Cones with Imperfect Axial Length

“…Generally, the most widely considered type of imperfection is the initial geometric imperfection such as eigenmode shape imperfection, axisymmetric outward bulge, localized smooth dimple and simple perturbation load. References into the influence of initial geometric imperfection on the load carrying capacity of conical shells can be found in (Błachut 2013;2012;Ifayefunmi and Błachut 2011;Khakimova et al 2014;Jabareen and Sheinman 2006;Castro et al 2015;Goldfeld 2007;Ifayefunmi, Mahidan, and Maslan 2020). Moreover, few studies have been devoted to other forms of imperfections such as imperfect boundary condition (Spagnoli 2003;Chryssanthopoulos and Spagnoli 1997;Castro et al 2014;Goldfeld and Arbocz 2004;, crack/material discontinuity on the structures (Ali 2013;Ifayefunmi 2017;Ifayefunmi and Ibrahim 2018).…”