Cone-cylinder and cone-cone intersections with or without ring stiffeners are common features in pressure vessels, piping components and other industrial shell structures. Under internal or external pressure, these intersections are subject to high circummferential membrane stresses as well as high ending stresses due to the presence of a slope discontinuity. As a result, they are suseptible to local plastic collapse. This paper presents a summary of a number of recent investigations into the plastic collapse behaviour and strength of cone-cylinder and cone-cone intersections. The aims of the paper are to clarify several aspects of the plastic collapse behaviour of these intersections, and to introduce a number of simple plastic collapse strength fromulas suitable for inclusion in future pressure vessel codes in a plastic design0by-analysis approach.
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