Abstract
A torispherical shell is known to buckle with circumferential waves on a knuckle region when it is subjected to excessive internal pressure. The circumferential waves observed are caused by bifurcation buckling. A torispherical shell is utilized as a head of a Boiling Water Reactor (BWR) contaiment vessel or a Fast Breeder Reactor (FBR) vessel or a component of chemical Plants. It may buckle due to overpressure caused by accidents. Dynamic loading may act on a torispherical shell due to accident. In general, the bifurcation load is lower in the case of dynamic loading than in the case of static loading. Therefore, it is important to obtain the bifurcation load for a torispherical shell due to dynamic loading from the viewpoint of estimating the safety margin of a torispherical shell under accident conditions. In the present paper, we calculate the bifurcation buckling pressure for the torispherical head of a Mark II-type BWR containment vessel, using a finite element program for a dynamic analysis. Three kinds of loading, that is, static loading, step loading and impulsive loading, are considered in the present analysis. The minimum bifurcation buckling pressure is predicted for the respective loadings.
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