Abstract：With consideration of the intermediate principal stress and different strength in tension and compression，the elasto-plastic bearing capacity of double and multilayer thick wall cylinder is analyzed based on unified strength theory. The separate radius, assemblage pressure and shrinkrange fundamental solutions are derived based on the yield condition for unified strength theory. The unified solutions for combined thick wall cylinder are also deduced. Parametric studies are carried out to evaluate the effects of unified strength theory parameter, tension-compression ratio, radius ratio and combined cylinder layer numbers on the unified solutions.
The results are versatile in the theory of combined thick wall cylinder and pressure vessel. It makes full use of the strength potentialities for combined cylinder due to considering the intermediate principal stress. The solution has an important practical value for the optimum design and engineering application of combined thick wall cylinder.
2014, Vol. 35 
