Numerical Simulation Of Welding Stress Of The Cone-Cylinder Pressure Hull Of Submarine And Its Effect On Fatigue Strength

The ship modularization mode with segmentation and block assembly is graduallybecoming popular while the technology of ship building was developed. In order to exert theefficiency and advantages of this construction mode, the block section butts of prefabricatedsections are gradually applied the “in-plane welded connection” instead of “step joint”.There are not enough analysis and the strength calculation of welding structures, particularlyanalysis on the impact of disfigurement on welding butts and seams.After studying formerresearch, this paper studies the welding residual stress of the T-joint using experimentationand finite element numerical simulation method. This study is valuable in impaction ofwelding structure with residual stressIn this paper, the residual stresses of the T-joint hull structures were predicted withFinite Element Method (FEM) and tests. Then the changing patterns of the residual stressesand its effect on ultimate strength were studied. The main contents are as follows:1, The welding residual stresses of the plates joint were obtained with the weldingprocedures developed by APDL of ANSYS, meanwhile, it were measured with a drillingmethod testing. It offers the method and parameter to study the residual stresses of theT-joint structures.2, Making some numerical simulation of welding on T-joint, that with different weldingbutts, analyzing temperature field and welding stress field, obtaining welding residualstress’s distributing rule.3, Ultimate strength checking of T-welded structure, which has the residual stress,comparing the result of ultimate strength with these both cases and experimentation.