长甲板室端部应力集中分析及优选设计研究

Analysis and optimum design on the stress concentration of long deckhouse end

针对长甲板室纵向围壁端部与主船体露天甲板交界处的应力集中问题,采用结构有限元数值分析方法,探讨在空间布置受到限制的条件下,应力集中交界处圆弧型肘板臂长、圆弧半径等参数变化对应力分布和大小的影响,并得到降低应力集中系数的圆弧型肘板参数的最佳值。文中根据研究结果,对某艘实船的长甲板室纵向围壁端部与主船体露天甲板交界处圆弧型肘板进行优选设计,有效地降低了该处的应力集中水平。

Long deckhouse casing ends often have stress concentration problems, and such a problem can be alleviated through planting a circular-arc bracket on the end of longitudinal deckhouse casing. In this paper, under the condition which the space layout of a ship is restricted, a study based on the structural finite element method is implemented to investigate the optimum effects of brackets with different sizes, namely bracket arm length and radius of circular-arc. According to the calculation results, two arms of a bracket should have equal length and the circular-arc radius has the optimal value so that an optimum design of circular-arc bracket can be presented. Based on the study results, an optimization design is carried out on a real ship by planting a circular-arc bracket in order to reduce the stress concentration on the connection of long deckhouse easing end and the main deck, which can serve as a good reference for production design.