基于疲劳强度的船舶甲板支撑结构设计

Design of ship deck support structure based on fatigue strength

船舶甲板支撑结构与船舶的功能性和使用寿命密切相关,大量的统计数据表明,船舶甲板支撑结构的破坏形式主要包括2种,一类是冲击破坏,另一类是疲劳破损。其中,由于船舶的工作环境长期处于波浪等周期性载荷的影响下,因此甲板结构的疲劳破坏是最主要的破坏形式。针对这一问题,对船舶甲板支撑结构的疲劳强度特性进行分析,结合S-N曲线法和热点应力分析方法,建立船舶本体及甲板的支撑结构有限元模型,在Ansys软件中完成了甲板支撑结构的疲劳强度仿真设计。

The ship deck support structure is closely related to the ship’s functionality and service life.A large number of statistical data show that there are mainly two types of damage to the ship deck support structure,one is impact damage,the other is fatigue damage.Among them,because the ship’s working environment is under the influence of periodic loads such as waves for a long time,therefore,Fatigue failure of deck structure is the main failure form.To solve this problem,this paper systematically analyzes the fatigue strength characteristics of the ship deck support structure.Combined with the S-N curve method and hot spot stress analysis method,the finite element model of the ship body and deck support structure is established,and the fatigue strength simulation design of the deck support structure is completed in Ansys software.