潜艇耐压艇体纵筋加强锥——柱结合壳结构行为的分析

Structural behavior of longitudinal-stiffened cone-cylinder shell combination in submarine pressure hull

为考察"纵筋加强锥—柱结合壳"的力学行为,设计了"纵筋加强锥—柱结合壳"作为计算模型,运用有限元方法分析了该模型凸/凹结合部母线方向和圆周方向应力分布。纵筋在纵向和环向均破坏了结构的连续性,在环向还破坏了结构的轴对称性,在纵筋端部(纵向)和纵筋与纵筋之间(环向)的壳板上产生了应力突变和很多应力集中点;此外,在锥—柱结合部增加了许多纵向焊缝,锥—柱结合部应力环境十分恶劣。这种结构形式增大了艇体出现疲劳破坏的危险性。在采用高强度钢(屈强比接近1)的大潜深潜艇的锥—柱结合部不能采用"纵筋加强"结构形式。

In order to investigate the structural behaviors of longitudinal-stiffened cone-cylinder shell com- bination, a computation model is designed. Stress distributions of convex and concave cone-cylinder joint plating at the ends of longitudinals and around the joint section of cone and cylinder. Meanwhile, longitudinals add many welds on cone-cylinder jointed zone.The stress distribution of the joint zone becomes worse and the risk of fatigue increases.h can be concluded that the structure behavior of longitudinal-stiffened cone-cylinder shell combination is bad; the longitudinal stiffeners can not be used at the cone-cylinder joint zone of large-diving-depth submarine built of high strength steel with σ5/σb approaching to 1.