Buckling of Axially Compressed Cones with Imperfect Axial Length

Abstract

The paper considers the effect of imperfect length on the buckling behavior of axially compressed mild steel truncated cone. Three types of initial geometric imperfections with different number of waves along the compressed edge are analyzed, and they are: (i) sinusoidal waves, (ii) triangular waves, and (iii) square waves. A validation of experimental data from previous study and further numerical calculations are provided in this paper. A good repeatability of experimental data was revealed through the test results with only 0% to 7% of error. Numerical simulations were carried out using ABAQUS FE code. It is shown that the buckling load of the cone is differently affected by the shape and amplitude of the imperfection. Apparently, the buckling loads of analyzed cones are less sensitive when imperfection shape is triangular as compared to other imperfection shapes. Furthermore, the effect of number of waves on buckling load of axially compressed cones was investigated for the above three cases. Results indicate that the influence of number of waves on the load carrying capacity of the cone is less significant.

Buckling of Axially Compressed Conical Shells with Multiple Imperfections

“…It is usually inevitable owing to the manufacturing process or unforeseeable damage (Dinkler and Knoke 2003). Several types of well-known imperfection includes the nonuniformity in the material's physical properties, geometric imperfections (Mahidan and Ifayefunmi 2020a;Ifayefunmi and Mahidan 2021;Khakimova et al 2014;Özyurt et al 2017), load eccentricities (Castro et al 2014), boundary conditions irregularities , crack imperfection (Ifayefunmi 2020;Ifayefunmi and Mahidan 2020;Cui and Shao 2015;Ali 2013), material discontinuity (Ifayefunmi and Ibrahim 2018;Ifayefunmi 2017), etc. To date, there is a vast amount of literatures that can be found concentrating on the effect of geometric imperfection on the buckling behaviour of certain structures such as conical and cylindrical shells.…”

“…properties of mild steel as referred toMahidan and Ifayefunmi (2020a).Young's modulus, E (GPa)Yield stress, σ yp (MPa) Poisson's ratio, υ Wall thickness, t (mm)…”