Review Article

Imperfection Sensitivity: A Review of Buckling Behavior of Cones, Cylinders, and Domes

[+] Author and Article Information
O. Ifayefunmi

Faculty of Mechanical Engineering,
Universiti Teknikal Malaysia Melaka,
Hang Tuah Jaya, Durian Tunggal,
Melaka 76100, Malaysia
e-mail: olawale@utem.edu.my

J. Błachut

Department of Mechanical Engineering,
The University of Liverpool,
Liverpool L69 3GH, UK
e-mail: em20@liverpool.ac.uk

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received February 14, 2017; final manuscript received March 11, 2018; published online August 2, 2018. Assoc. Editor: Reza Adibiasl.

J. Pressure Vessel Technol 140(5), 050801 (Aug 02, 2018) (8 pages) Paper No: PVT-17-1030; doi: 10.1115/1.4039695 History: Received February 14, 2017; Revised March 11, 2018

It is generally accepted that the presence of imperfections in pressure vessel components can significantly reduce their buckling strength. In fact, the discrepancies between theoretical predictions and experimental results have been attributed to various kinds of existing and unavoidable imperfections. This is not a new problem but despite of substantial research effort in this area over the recent decades, it is far from being satisfactorily resolved. This review provides insight into the past findings and current activities related to the role of different types of imperfections on the buckling strength. It aims to contribute to a better understanding of the influence of imperfections on the structural stability of cones, cylinders, and domes when these are subjected to external loading conditions. The review concentrates not only on the prominent role of initial geometric imperfections of the shell's generator but also on less known defects. This includes uneven axial length of cylinders, eccentricities, and nonuniformities of applied load, inaccurately modeled boundary conditions, corrosion of the wall, influence of material discontinuity or crack, and effect of prebuckling deformation. The study examines: (i) how the data were obtained (analytically, experimentally, and/or numerically), (ii) the type of material from which the shell structures were made, and (iii) the importance of findings of the previous works. Metallic and composite components are considered.

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Grahic Jump Location
Fig. 1

Geometry of: (a) truncated cone, (b) circular cylinder, and (c) dome, e.g., torisphere

Grahic Jump Location
Fig. 2

Sensitivity of compressive buckling force to the amplitude, 2 A, of axial imperfection

Grahic Jump Location
Fig. 3

Localized off-axis flat patch (a) collapsed steel dome with apex flattening (b), and sensitivity of buckling load to the amount of flattening

Grahic Jump Location
Fig. 4

Sensitivity of buckling pressure in composite torispheres to: (i) eigenmode-type imperfections (n = 10), (ii) and (iii) force-induced dimples, and (iv) increased-radius lower bound. note: s = 0.0 at the apex. Reprinted with permission from Elsevier @ 2016 [90].



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