水下近距爆炸作用下船体梁的动态响应特性  

Dynamic Response Characteristics of Ship-Like Beam Subjected to Underwater Explosion in Near Field

作　　者：朱锡[1] 李海涛[1] 牟金磊[1] 黄晓明[1] 

机构地区：[1]海军工程大学船舶与动力学院,湖北武汉430033

出　　处：《高压物理学报》2010年第5期343-350,共8页Chinese Journal of High Pressure Physics

基　　金：国家"973"重大基础研究项目(51335020101)

摘　　要：为研究舰船在水下近距爆炸作用下的结构响应及损伤模式,以相似准则为基础,设计了船体梁模型,选用4种不同能量结构的炸药,将其置于模型中部正下方爆炸,通过改变药量和爆距,实验研究了船体梁在近距爆炸作用下的动态响应特性。利用高速摄影技术观察了模型的整个运动过程,结合实验数据定量分析了结构的应变和加速度响应特性,比较了冲击波和气泡脉动对结构的损伤特点。研究发现:近距爆炸气泡脉动会使结构下方形成一个低压流体区,该低压区的存在会使模型受到中垂弯矩作用,并可能使其发生中垂弯曲破坏;随着爆距的增大,爆炸能量与损伤效果之间的相关性变得明显;近距条件下,为了发挥爆炸气泡的最大破坏作用,爆距应该接近于最大气泡半径。To study dynamic response and overall damage modes of warship subjected to underwater explosion in near field,a ship-like model was designed based on similarity criterion.The dynamic response was investigated by changing stand-off and weight of explosive in experiments where four kinds of explosives were located closely under the mid-span of the hull girder.In experiments,high-speed photography was applied to obtain the girder＇s movement process.Simultaneously,the data of strain and acceleration was attained to make a detail analysis on how the object reacts against shock wave and bubble.Experimental results show that there exits a low-pressure fluid zone below the girder due to bubble pulse in near field.The low-pressure area makes the girder undergo a vertical bending moment and possibly suffer an overall bending damage.With the increase of stand-off,the relevance of explosion energy and damage effect gradually increases.If stand-off is close to the maximum bubble radius,the bubble will exert a maximum damage effect on the structure.

关 键 词：爆炸力学 水下近距爆炸 冲击波 气泡脉动 动态响应 实验研究 

分 类 号：O383.1[理学—流体力学] U661.7[理学—力学]