Damaging characteristics of a cabin model under close-in underwater explosion from bottom attacting
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摘要: 底部近距离爆炸可对水面舰船造成致命性打击，为探究其破坏机理，本文中开展了底部近距离爆炸下舱段模型的毁伤试验，获取了舱段模型破损区域试验数据、非破损区域的冲击环境数据。同时借助舷侧近距离爆炸试验结果、底部中远场爆炸试验结果，综合对比可发现：（1）底部近距离爆炸下，舱段模型会呈现整体隆起变形、爆心区域撕裂并伴有较大凹陷变形、舷侧外板大面积屈曲失稳等典型特征；（2）相比舷侧爆炸方位，底部爆炸对舱段模型具有很强的综合毁伤效果，底部爆炸相对舷侧爆炸对舱段模型的综合毁伤效果可提高40%以上；（3）在冲击环境方面，底部近距离爆炸下非破损区域测点中高频段的冲击谱曲线变化趋势基本与中远场爆炸一致，但在低频阶段，底部近距离爆炸下的谱位移要远高于中远场爆炸工况。Abstract: Experiment of cabin model subjected to close-in underwater explosion from bottom attacting was investigated to explore the damage failure model of warship, The demolishing region datas of cabin model together with shock environment information were obtained. Furthermore, by contrasting the experimental results from the case of close-in underwater explosion from ship broadside attacting and far-mild field shock environment trial. It is concluded that: (1) the typical failure of cabin model mainly contains the whole deformation, tearing in the middle along with local dish on both sides; (2) the bottom attacting method has more destruction ability in contrast to the ship broadside attacting way, it is found more than 40% damage effect can be increased according to the experimental results; (3) the variation tendency of measuring point shock spectra between close-in and far-mild field bottom underwater explosion at middle and high frequency level, Unfortunately, for the low frequency level the values of close-in underwater explosion are greater than the latter.
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Key words:
- bottom underwater explosion /
- failure model /
- damage effect /
- shock environment
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图 3 Q345B钢不同应变率下的应力应变曲线
Figure 3. Stress-strain curves of Q345B at different strain rates
图 4 舱段模型中加速度、中频振子测点布置示意图
Figure 4. Layout of measuring points for acceleration, intermediate frequency oscillator
图 6 底部近距离爆炸后舱段模型整体毁伤结果
Figure 6. The damage result of the cabin model after bottom close-in underwater explosion
图 11 典型测点加速度、速度、位移曲线
Figure 11. The acceleration, velocity, displacement history time curves of typical points
图 12 中频振子修正下的测点冲击谱
Figure 12. The diagram of shock spectrum with intermediate frequency oscillator correcting
图 15 舷侧近距离爆炸下舱段模型毁伤结果
Figure 15. The cabin model damage after shipboard close-in underwater explosion
图 16 舷侧爆炸、底部爆炸后剩余强度对比
Figure 16. Residual ultimate strength contrasting between broadside and bottom explosions
表 1 试验工况表
Table 1. Experimental cases
工况 爆炸方位 药量/kg 爆距/m 爆点位置 备注 1 底部 2.0 0.18 垂向水线下方1.18 m，横向位于船舯 主要试验 2 底部 1.0 6.66 垂向水线下方7.66 m，横向位于船舯 冲击环境对比试验（冲击因子0.15、0.25） 3 底部 1.0 4.00 垂向水线下方5.0 m，横向位于船舯 4 舷侧 2.8 0.18 垂向水线下方0.44 m，横向距离舷侧0.125 m 毁伤对比试验 
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