摘要
目的分析船-冰作用过程中多重载荷对结构动响应的影响。方法开展冰体挤压和冲击作用下板格结构动响应数值分析,对比分析冰体挤压和冲击作用下板格的吸能、变形等动响应特征以及冰体的破碎情况,探讨不同载荷次序对结构变形的影响。结果冰体挤压过程近似为反复“加载—卸载”的准静态过程,冰体冲击过程是冰体动能短时间内向结构内能转化和破碎耗散的动态过程。在同种载荷形式作用下,冲击/挤压组合载荷工况的变形发展规律与单一载荷变形规律基本一致。结论组合载荷作用工况,第一阶段载荷造成板格发生塑性变形,由于应变强化和膜应力影响,使得第二阶段初期的板格变形值均小于单一载荷工况。在冰体挤压/冲击组合载荷作用下,板格结构动响应规律可为船-冰相互作用机理研究和结构安全性评估提供支撑。
The work aims to analyze the influence of multiple loads on the structural dynamic response during ship-ice interaction.A numerical analysis on the dynamic response of plate panels under ice extrusion and impact was carried out.The dynamic response characteristics,such as energy absorption and deformation of the plate panels,as well as the ice crushing conditions,were comparatively analyzed under ice extrusion and impact.The influence of different load sequences on structural deformation was discussed.The calculation results showed that the ice extrusion process was approximately a quasi-static process of repeated"loading-unloading",and the ice impact process was a dynamic process in which the kinetic energy of the ice was converted into the internal energy of the structure and dissipated through fragmentation in a short period of time.Under the same load form,the deformation development law of the impact;extrusion combined load condition was basically consistent with that of the single load.In the combined load condition,due to the plastic deformation of the plate panel caused by the first-stage load,and the influence of strain hardening and membrane stress,the plate panel deformation value in the initial stage of the second stage is smaller than that in the single load condition.The dynamic response law of plate panel structures under ice extrusion;impact combined loads can provide support for the research on the mechanism of ship-ice interaction and structural safety assessment.
作者
李政杰
汪高飞
许育文
赵南
冯国庆
LI Zhengjie;WANG Gaofei;XU Yuwen;ZHAO Nan;FENG Guoqing(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China;China Ship Scientific Research Center,Jiangsu Wuxi 214082,China;National Key Laboratory of Ship Structural Safety,Jiangsu Wuxi 214082,China;Taihu Lake Laboratory of Deep Sea Technology and Science,Jiangsu Wuxi 214082,China)
出处
《装备环境工程》
2025年第11期85-96,共12页
Equipment Environmental Engineering
关键词
船-冰相互作用
挤压与冲击
组合载荷
动响应特征
数值仿真
塑性变形
ship-ice interaction
extrusion and impact
combined loads
dynamic response characteristics
numerical simulation
plastic deformation
