LAUSR

One of the most effective methods for increasing capacity of thick-walled cylindrical pressure vessels is creating compressive residual stress in their walls. This can be applied by using multilayer shrink fitted or autofrettaged cylinders or combination of these methods. In this study, for a three layer compound cylinder, effects of interference fit values and their locations and autofrettage pressure were studied on the working pressure. Analytical and numerical results show that proper values and locations of the applied interferences can increase the capacity up to two times versus simple cylinder. Applying low-pressure autofrettage (less than one quarter of full autofrettage) on the compound cylinder can more increase the working pressure.