Dynamic Response Characteristics of Ship-Like Beam Subjected to Underwater Explosion in Near Field
-
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。Abstract: 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.
-
Key words:
- explosion mechanics /
- underwater nearby explosion /
- shock wave /
- bubble pulse /
- dynamic response /
- experimental study
-
John M B, George Y, Paul J S. Time-Resolved Measurement of the Deformation of Submerged Cylinders Subjected to Loading from a Nearby Explosion [J]. Int J Impact Eng, 2000, 24: 875-890. Li Y J, Zhang X C, Wu Y S, et al. Whipping Response of Ship Hull Induced by Underwater Explosion Bubble [J]. Shipbuilding of China, 2001, 42(3): 1-7. ( in Chinese) 李玉节, 张孝慈, 吴有生, 等. 水下爆炸气泡激起的船体鞭状运动 [J]. 中国造船, 2001, 42(3): 1-7. Li Y J, Pan J Q, Li G H, et al. Experimental Study of Ship Whipping Induced by Underwater Explosion Bubble [J]. J Ship Mech, 2001, 5(6): 75-83. Zhang A M, Yao X L. Interaction of Underwater Explosion Bubble with Complex Elastic-Plastic Structure [J]. Appl Math Mech, 2008, 29(1): 81-92. ( in Chinese) 张阿漫, 姚熊亮. 水下爆炸气泡与复杂弹塑性结构的相互作用研究 [J]. 应用数学和力学, 2008, 29(1): 81-92. Li H T, Zhu X, Huang X M, et al. An Experimental Study on the Dynamic Response of Ship-Like Model Subjected to Underwater Explosion Bubble Located Closely [J]. Journal of Harbin Engineering University, 2008, 29(8): 773-778. ( in Chinese) 李海涛, 朱锡, 黄晓明, 等. 近场脉动气泡作用下船体梁模型动响应试验研究 [J]. 哈尔滨工程大学学报, 2008, 29(8): 773-778. Rao G N, Chen W H, Hu Y T, et al. Experimental Sudy on Underwater Energy Output Characteristics of Different Explosives [J]. Explosive Materials, 2007, 36(1): 9-11. ( in Chinese) 饶国宁, 陈网桦, 胡毅亭, 等. 不同炸药水下能量输出特性的实验研究 [J]. 爆破器材, 2007, 36(1): 9-11. Zhang Z H, Zhu X, Bai X F. The Study on Numerical Simulation of Underwater Blast Wave [J]. Explosion and Shock Waves, 2004, 24(2): 182-188. ( in Chinese) 张振华, 朱锡, 白雪飞. 水下爆炸冲击波的数值模拟研究 [J]. 爆炸与冲击, 2004, 24(2): 182-188. Zhou L, Xu S H, Xu G G. Research on Energy Output Characteristics for Underwater Explosion of Explosives [J]. Acta Armamentarii, 2006, 27(2): 235-238. ( in Chinese) 周霖, 徐少辉, 徐更光. 炸药水下爆炸能量输出特性研究 [J]. 兵工学报, 2006, 27(2): 235-238. Ding C X, Cui Y J. Determination of Intrinsic Constants of Bubble Energy with Least Square Method [J]. Explosive Materials, 1994, 23(3): 1-7. ( in Chinese) 丁长兴, 崔应娟. 用最小二乘法求气泡能的固有常数 [J]. 爆破器材, 1994, 23(3): 1-7.
点击查看大图
计量
- 文章访问数: 8288
- HTML全文浏览量: 281
- PDF下载量: 824