Supported by the State Key Program of National Natural Science of China‘Structural Reliability Analysis on the Spherical Hull of Deepsea Manned Submersibles’(Grant No.51439004);The Scientific Innovation Program Project of‘Key Technology Research and Experimental Validation of Deep Manned Submersible’by the Shanghai Committee of Science and Technology(Grant No.14DZ1205500);Project of Shanghai Engineering Research Center of Hadal Science and Technology(Grant No.14DZ2250900);The National Hi-tech Research and Development Plan(863 Plan)Project of China(Grant No.2014AA09A110)