水下爆炸作用下箱形梁整体损伤的参数分析  

Analysis of parameters on overall damage of box-like beam subjected to underwater explosion

作　　者：李海涛[1] 王俊森[2] 牟金磊[3] 王晓强[1] 

机构地区：[1]海军工程大学科研部,湖北武汉430033 [2]海军工程大学动力学院,湖北武汉430033 [3]海军工程大学舰船工程系,湖北武汉430033

出　　处：《华中科技大学学报（自然科学版）》2013年第4期123-127,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51109216)

摘　　要：为了研究水下近距爆炸气泡对梁的中垂和中拱弯曲损伤作用,设计了两种对称结构的全封闭箱形梁模型,利用通用有限元软件Dytran进行数值计算,比较分析了爆炸距离、爆炸位置、舱室大小、附加质量等参数变化对梁整体运动响应的影响特性.结果表明:梁的一阶湿频率与气泡脉动频率相近时,气泡对梁造成的中垂弯曲损伤作用大于中拱弯曲损伤;炸药在梁中部正下方近距爆炸,且爆径比参数大于且接近于1时,气泡对梁的中垂损伤作用最明显;合理的大舱室布置会改变梁结构应力分布状态,降低梁整体损伤的可能性.To reveal the effect of bubbles underwater explosion, two symmetrical box-like beams were designed, and a numerical simulation method was presented to study the dynamic responses of the beams subjected to underwater explosion by changing parameters, such as explosivers stand-off dis- tances, disposals, dimensions of the beams＇ cabin, and mass added. The results show that the bubble has a more remarkable effect on making bearers sagging damage than hogging damage when its oscilla- tion frequency is close to the first-order wet mode frequency of the beam. When the bubble locates be- low the midspan of beam, and the ratio of stand-off to maximum bubble radius is equivalent to one, the maximum effect of the bubble on making sagging damage appears. With reasonable dimension and disposal of big cabin, the possibility of overall damage of box-like beam will obviously decrease.

关 键 词：爆炸力学 水下爆炸 气泡脉动 中垂损伤 损伤模式 数值计算 箱形梁 

分 类 号：U661.7[交通运输工程—船舶及航道工程] O383[交通运输工程—船舶与海洋工程]