necessary equations and details of the formulation may be found in Refer- 

 ence 12; they are not given here because of their length and rather formi- 

 dable nature. However, it is worth mentioning here that extensive exper- 

 imental evaluation has been obtained of the Short-Bart analysis. For 



1 3 

 example, Keefe and Overby present the results of structural model 



tests undertaken to check the "end-bay" theory Reference 12. Also, 

 Keefe and Short present a method for eliminating the effect of end con- 

 ditions on the static collapse strength of stiffened cylindrical pressure 

 hulls and give experimental verification of the suggested procedure. 



Another special problem of interest to pressure hull designers, and 

 one worth mentioning here, is that concerned with the discontinuity 



stresses which arise at the juncture of axisymmetric shells possessing 



1 5 

 dissimilar meridional shape. Raetz and Pulos present an analysis for 



determining the elastic deformations occurring at either cone-cylinder or 



cone-cone junctures and discuss several other analyses developed by 



earlier investigators, notably Wenk and Taylor. 



Conical transition sections are used rather extensively to join 



cylindrical hull components of different diameter, and not only is the 



problem of the edge effects on static collapse strength of the "weakened" 



bays of concern, but also, the occurrence of high, localized longitudinal 



stresses in these juncture regions is of great concern from the point of 



view of low-cycle fatigue in way of welded joints. Raetz discusses this 



problem and suggests the use of flexible, tapered ring-segments at these 



30 



