摘要
为研究水下接触爆炸下沉箱码头毁伤效应和毁伤机理,通过LS-DYNA有限元软件建立沉箱码头水下接触爆炸模型,进行数值模拟研究,并通过试验验证模型准确性。结果表明:运用有限元方法能够较好地模拟水下接触爆炸作用下沉箱码头的毁伤效应,沉箱码头的破坏过程可分为两个阶段:冲击波阶段,沉箱外墙产生初始破口和环状裂缝;气泡膨胀阶段,爆轰产物从破口涌入仓格加速了仓格的变形和毁伤,仓格顶部变形严重导致码头面板破坏,气泡由于冲出水面提前溃灭,码头毁伤在0.14倍的气泡第一次脉动周期基本停止。对比不同爆炸深度,水域中部接触爆炸下沉箱毁伤最为严重,近水面接触爆炸对码头面板的毁伤作用更强。
In order to study the damage mechanism of a caisson wharf under underwater contact explosion,the damage characteristic caisson wharf subjected to underwater contact explosion was simulated by using the LS-DYNA software.The credibility of simulation results was verified by comparative analysis of experimental results.The results show that numerical simulation can reflect the experimental result effectively.The failure process of caisson wharf can be divided into two stages.The circumferential cracks and crater appear in the blast side during the shock wave propagation.During the bubble expansion stage,the detonation products flow into the caisson bin from break accelerating the deformation and damage of the caisson cage.The deformation of the cage seriously led to the damage of the wharf panel.The bubble rush out of water and collapse.Accordingly,the severest damage is stopped when it is about 14%of the first pulsation period of underwater explosion bubble.When the location of charge detonation is in the middle of water depth,underwater contact explosion causes more overall damage to the caisson.When the location of charge detonation is near water face,it causes more damage to wharf panel.
作者
刘靖晗
唐廷
韦灼彬
董琪
李凌锋
LIU Jinghan;TANG Ting;WEI Zhuobin;DONG Qi;LI Lingfeng(Naval University of Engineering,Wuhan 430033,Hubei,China;Naval Logistics Academy,Tianjin 300450,China)
出处
《爆炸与冲击》
EI
CAS
CSCD
北大核心
2020年第11期96-104,共9页
Explosion and Shock Waves
基金
军队后勤科研计划(CHJ13J006)
海军工程大学科研资助立项项目(425517K210)。
关键词
水下接触爆炸
沉箱码头
毁伤效应
气泡
炸深
underwater contact explosion
caisson wharf
damage effect
pulsation bubble
explosive depth
作者简介
第一作者:刘靖晗(1992-),男,博士研究生,1226001717@qq.com;通信作者:唐廷(1980-),男,博士,讲师,kublai@126.com。
