深潜器在海洋开发中扮演非常重要的角色，其中耐压球壳作为保证潜水器设备和人员安全的关键部件，其结构设计直接关系到深潜器总体性能和重量指标。耐压球壳壳体的焊接工艺对结构极限强度有不可忽视的影响，因此本文提出一种耐压球壳极限强度的数值计算方法，其充分考虑了焊接加工工艺对壳体极限强度的影响，包括焊接对焊道周围材料属性的影响，焊接引起的变形以及残余应力。经由与试验结果对比，该数值方法结果较为精确，且计算结果偏于保守，表明该方法能考虑到工程安全性，有实际工程意义及较强的工程应用价值。
Deep Sea Vehicle (DSV) is indispensable to marine development, and the pressure spherical shell,the structure design of which is key to general performance and weight index of DSV, forms the heart of equipment and personnel safety. The welding process has an assignable impact on the ultimate strength of the pressure shell. Therefore, in this paper, a numerical method considering the welding process is presented, which takes the material property change,the residual stress as well as the deformation induced by welding into account. Firstly, welding numerical simulation is carried on based on Gaussian heat source. Secondly, the material affected by welding is distinguished as equivalent property and equivalent zone. Finally, the ultimate strength of the pressure shell is worked out by numerical method. Comparison with previous experiment as well as numerical simulation shows that the numerical results proposed in this study are slightly lower,that's because the welding process is not completely considered in the literature. Thus the numerical method in the present study allows for the safety margin, it has high engineering value.
2019,41(4): 49-53 收稿日期：2019-01-14
DOI：10.3404/j.issn.1672-7649.2019.04.010
分类号：U663.9
基金项目：国家自然科学基金资助项目（51609055）
作者简介：张喜秋(1984-),女,讲师,研究方向为船舶与海洋工程
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