Photoelastic Study of Stresses in a Cylindrical Pressure Vessel with a Nozzle : 1st Report, Flush Type Nozzle

Abstract

The photoelastic stress-freezing and slicing method is applied to determine the stress distributions in a cylindrical pressure vessel with a flush type nozzle, under internal pressure. The nozzle is attached perpendicularly to the vessel. Test models made of an epoxy resin are fabricated by casting so as to make the nozzle and the main cylinder one body, using molds of curing silicone-rubber which are reinforced by this iron pipes. The experiment is performed on different sizes of the nozzle and various dimensions of the fillet radius on the outside surface at the junction between the nozzle and the main cylinder. The stress distributions along the outside and inside surfaces of the models are given in the region of the junction. Effects of nozzle sizes and fillet radii on the stress concentration are discussed in some detail.