Axisymmetrical Collapse of Circular Cylindrical Shell Subjected to Hydrostatic Pressure

Abstract

In this paper, the load carrying capacities of circular cylindrical shells subjected to hydrostatic pressure were investigated when the shells failed in axisymmetrical collapsing. Twenty six models with one bay and two rings having large sectional area were used for this investigation, but fourteen models result in shell buckling. Those models were fabricated with machine tools on a mandrel having outside diameter 110mm and had the following geometric characteristics (See Table 1). Inner diameter =110 mm, Thicknesses=1.0, 1. 2, 1. 4, 1. 5mm Distances between surfaces of rings= 22. 560. 0 mm Sectional dimensions of ring =15mm×15mm Deflection detector shown in Fig. 5 was used to record the deflection patterns at the mid-length prior to the collapsing. The circumferential and axial strains of the shells were measured with electrical strain gages. On the other hand, the behaviors of the shells for axisymmetrical deformation were analized by finite element method. The following conclusions were obtained. (1) Average deflections of the shells prior to the collapsing given by ∫2πr0wds/2πr roughly agree with those calculated by the finite element method in most cases.(2) Correlation of the experimentally obtained axisymmetrical collapsing loads with the calculated results by finite element method showed good agreement.