摘要
在水下爆炸载荷作用下的舰船局部结构塑性变形计算中,往往只考虑冲击波载荷的影响而忽略气泡载荷的影响。为研究气泡载荷在舰船局部结构塑性变形中所占的比例,利用通用有限元软件Abaqus,对舰船局部结构典型形式加筋板模型在水下爆炸载荷作用下的动态响应进行了数值仿真。其中,载荷计算采用了Geers-Hunter模型,材料本构采用了Johnson-Cook模型。分析仿真结果发现,模型中点变形挠度明显分为两个阶段,很容易区分冲击波载荷引起的变形和气泡载荷引起的变形。将最终变形挠度仿真计算结果与试验结果进行对比,两者吻合较好。计算结果表明:由气泡载荷引起的加筋板塑性变形挠度超过总变形挠度的30%,所以在计算中气泡载荷的影响不容忽视。
In the calculation,the shock wave load is only considered to be responsible for the plastic deformation of ship′s local structures,but the bubble is usually neglected.In order to study the plastic deformation of ship′s local structures subjected to underwater explosion bubble,the dynamic plastic reactioin to the typical form stiffened plate of ship′s local structures was simulated by using FEM software Abaqus.The underwater explosion load was calculated by using the Geers-Hunter model.The material was simulated by the Johnson-Cook model.The numerical results show that the displacement-time curve is divided into two phases.The simulation results are coincident with the experimental ones.As the plastic deformation induced by bubble load exceeds 30% of the total value,thus the bubble load cannot be neglected.
出处
《海军工程大学学报》
CAS
北大核心
2010年第3期36-40,共5页
Journal of Naval University of Engineering
基金
国家安全重大基础研究资助项目(51335020103)
关键词
船舶结构力学
爆炸力学
水下爆炸
气泡
加筋板
ship structural mechanics
mechanics of explosion
underwater explosion
bubble
stif-fened plates
