近距水爆冲击波对船体梁总体毁伤的“刀锋效应”

“Blade effect” on the overall damage of hull girder caused by near field undex shock wave

针对船体梁在船舯底部受到近距水下爆炸冲击波作用下的中拱毁伤现象进行了研究.首先分析了水中装药在船舯底部近距爆炸时对船体梁的冲击载荷时空场.在船体梁运动模式分析的基础上,建立了不同冲击载荷时空场区域下的运动微分方程并进行求解.将计算结果与船体梁模型水下爆炸试验结果对比验证了理论方法的有效性.在分析船体梁运动规律的基础上,揭示了其毁伤机理,并提出了近距水爆冲击波作用下导致船体梁总体毁伤的"刀锋效应"概念.

The hog damage phenomenon of hull girder subjected to near field undex shock wave on midship is implemented. Firstly, the space-time field of impact load on hull girder subjected to near field undex below the midship is analyzed. Based on the motion pattern of hull girder, motion differential equations in different phases are established and solved respectively. By comparing the theory result with the experiment, the theoretical method is proved to be correct. The damage mechanism of hull girder is revealed by analyzing the motion law of hull girder, and the concept of ＂blade effect＂ which causes the overall damage of hull girder subjected to near field undex shock wave is presented.