Cumulative Damage Effect of Hull Girder Subjected to Multiple Underwater Explosions
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摘要: 针对在多次水下爆炸中船体梁的累积毁伤问题，采用 AUTODYN软件与试验相结合的方法，分析了炸药当量、爆距、爆炸次数等因素对船体梁累积毁伤效应的影响。结果表明：在水下爆炸加载作用下，船体梁会发生中部凹陷局部塑性变形和整体中拱塑性弯曲变形。在一定冲击因子作用下，其挠度与水下爆炸加载次数呈线性关系，且药量越大，挠度越大。爆距相同时，同等当量炸药对船体梁进行单次和均分连续3次水下爆炸加载，其最终塑性变形挠度不同，均分连续3次爆炸作用下船体梁的塑性变形挠度更小。Abstract: To explore the accumulative damage problem of the hull girder subjected to multiple underwater explosions, the influences of explosive equivalent, stand-off distance, and the number of explosions to the hull girder were studied by ultilizing of AUTODYN software together with testing methods. The results show that under underwater explosive loadings, there are two deformation modes, i.e., local plastic deformation of middle depression and plastic bending deformation of global hogging. At a certain shock factor, the deflection values change linearly with the loading times of multiple underwater explosions, and they increase with the increase of explosive charge. The final deflection values of hull girders are different between the cases subjected to single and those to uniform three consecutive underwater explosions under the same stand-off distances and equivalent charges. The deflection values of hull girders decrease subjected to three-time uniform explosions, and are only half of the deflection values under single-time explosion loadings.
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Key words:
- multiple underwater explosion /
- hull girder /
- accumulative damage /
- numerical simulation
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图 4 第2次水下爆炸后船体梁底部
Figure 4. Bottom of hull girder after the second underwater explosion
图 5 第3次水下爆炸后船体梁变形
Figure 5. Deformation of hull girder after the third underwater explosion
图 8 100 mm爆距有限元计算模型
Figure 8. Finite element model for the calculation case with 100 mm stand-off distance
图 10 船体梁变形的试验与数值模拟结果对比
Figure 10. Comparison of deformation of hull girder between test and simulation results
图 11 多次爆炸加载后累积挠度值
Figure 11. Cumulative deflection values after multiple explosive loading
表 2 各工况计算参数
Table 2. Parameters in different calculation cases
No. W/g H/mm Q/(g1/3·m−1) Rmax/mm n 1 1 100 10.0 154 5 2 8 200 10.0 309 5 3 27 300 10.0 460 5 4 3 100 14.4 220 5 5 10 150 14.4 330 5 6 24 200 14.4 445 5 7 8 100 20.0 310 3 8 27 150 20.0 464 3 
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