Ultimate strength of pressure spherical hull in deep-sea manned submersibles
LU Bei1, LIU Tao2, CUI Wei-cheng2(1 School of Naval Architecture and Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200030, China;2 China Ship Scientific Research Center, Wuxi 214082, China)
Most of present researches on the submersibles pressure hulls are based on thin shell theory,but pressure spherical shells of deep-sea manned submersibles are indeed thick shells.Currently there is no analytical solution about thick spherical hulls under uniform pressure,only American Navy Taylor Model Basin formula and Russian formula are available.In this paper,finite element (FE) method is used to study the ultimate strength of pressure spherical hulls in deep-sea manned submersibles.By comparing various FE parameters, a validated model was established.Using this model,the calculation result is found to be in agreement with the experiment result, while the two formulas' results are on the lower side. Then the ultimate strength of pressure spherical hulls under different thickness-radius ratio is studied,as well as the effect of the initial imperfection.As for the deep-sea manned submersibles,the ultimate strength of pressured spherical hulls is recommended to be obtained by FE method.The effect of the initial imperfection to the ultimate strength is not significant when the spherical hull is finely manufactured.For the convenience of application, the relationships between the ultimate strength of the perfect spherical hull and that with imperfection are provided.
【CateGory Index】： U661.4