Parametric study on buckling behaviour of thin stainless steel cylindrical shells for circular dent dimensional variations under uniform axial compression

Abstract

It is well known that thin cylindrical shell structures have wide applications as one of the important structural elements in many engineering fields and its load carrying capacity is decided by its buckling strength which in turn predominantly depends on geometrical imperfections present in it. Geometrical imperfections can be classified as local and distributed geometrical imperfections. But in this work, only local geometrical imperfection namely dent is considered for analysis. The main aim of this study is to determine the more influential dimensional parameter out of two dent dimensional parameters, one is the extent of dent present over a surface area and the other is dent depth, which affect the buckling strength of the cylindrical shells drastically. To account for the parameter "extent of dent present over an area", the dent is considered as circular dent and its amplitude is considered as dent depth. For this purpose, finite element (FE) models of cylindrical shells with a circular dent at half the height of cylindrical shells having different dent sizes are generated. These FE models are analyzed using ANSYS nonlinear buckling analysis. It is concluded that extent of dent present over an area is more influential than dent depth. To verify this conclusion further, FE models of cylindrical shells with two circular dents at half the height of cylindrical shell placed at 180˚ apart having different dent sizes are generated and analyzed.

The Analysis of the Behaviour of Suspended Flexible Steel Bunkers

“…(Ягофаров 1980). Vienas iš pagrindinių tokių kabamųjų konstrukcijų trūkumų, lyginant su įprastiniais standžiais bunkeriais, yra didelis jų deformuojamumas veikiant asimetrinėms, ir lokalioms apkrovoms (Aghajari 2006;Prabu 2010;Doerich 2008). Siekiant mažinti tokių konstrukcijų kinematinės kilmės poslinkius pagrindiniam ištisiniam lakštui reiktų suteikti baigtinį lenkiamąjį standumą (Brown 2001;Brown 1998 Bunkerio lakštas buvo apkrautas savojo svorio ir birios medžiagos slėgio apkrovomis.…”

Effects of Length to the Diameter Ratio on the Buckling Behavior of Cylinders under Axial Load

“…A simulation is achieved, Prabu et al, [4], using a finite element method to model different sizes of circular dent at half the height of cylindrical shells, the parameter of this analysis is "external of dent present over an area". The ANSYS finite element program used in this simulation, the extent of dent present over an area is more influence than dent depth.…”