Abstract: In order to study the influence of round transition on stress distribution at the nozzle junction of a spherical shell, finite element model is built in the light of large opening spherical shell with flatting nozzle and inside-stretching nozzle differently. It is carried on finite element analysis through capturing stress nephogram and path-linearization. The study shows there is higher stress concentration at the nozzle junction. Sharp-angled transition can produce higher stress than round transition, Round transition can reduce stress compared with sharp-angled transition in any case it is a flatting nozzle or an inside-stretching nozzle. Maximum stress value can reduce 8% approximately. Besides maximum stress, other stresses all have some decline. So, we can adopt round transition for reducing stress and increases strength. The study provides an important foundation for building finite element model in future.
Key words: Spherical shell, opening nozzle, finite element, maximum stress