Numerical simulation on steel box damage under internal explosion by smoothed particle hydrodynamics
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摘要: 随着恐怖袭击的不断演化，船舶、桥梁等以钢箱为主要支撑的战略性结构逐渐成为恐怖袭击和敌方军事打击的重要目标。本文中采用光滑粒子流体动力学(smoothed particle hydrodynamics, SPH)方法对钢箱内部爆炸过程进行了数值模拟，对比实验，分析了钢箱内部爆炸时钢箱表面的变形过程，得到了钢箱表面挠度值的变化趋势、不同时刻钢箱表面压强和von Mises应力的分布情况、钢箱表面中心点处速度和压强的变化趋势，验证了SPH方法在模拟钢箱内部爆炸问题上的有效性。通过进一步数值模拟，探讨了钢箱内部不同位置爆炸时钢箱的破坏形式和损伤程度，结果表明：炸药在钢箱内部角隅处爆炸时，钢箱的损伤程度最严重；炸药在钢箱内部正中心爆炸时，钢箱的损伤程度最轻。
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关键词:
- 钢箱 /
- 内部爆炸 /
- 光滑粒子流体动力学 /
- von Mises应力 /
- 变形
Abstract: With the strategic structure of the evolving terrorist attacks, ships and bridges which are supported by steel boxes gradually become important targets of terrorist attacks and enemy military strikes. We simulate the explosion process in a steel box by applying the smoothed particle hydrodynamics (SPH) method, analyze the deformation process of the steel box during the internal explosion, obtain the distributions of the pressure and the von Mises stress at different times, and achieve the trend of velocity and pressure at the center of the steel box plate. We find the feasibility and accuracy of the SPH method in simulating the internal steel box explosion through comparing with the experiment. We simulate the damage form and damage degree of the steel box structure subjected to internal blast at different positions. The results show that: when the explosive explodes at the corner and 60 mm from each box’s plate, there is the most serious damage; when the explosive explodes in the center, there is the least damage.-
Key words:
- steel box /
- internal explosion /
- smoothed particle hydrodynamics /
- von Mises stress /
- deformation
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图 1 钢箱和TNT炸药试件模型图
Figure 1. Model diagrams for the steel box and TNT dynamite specimen
图 3 钢箱内部爆炸过程中不同时刻箱体内壁的变形情况
Figure 3. Its inner wall deformation at different times for the steel box subjected to inner explosion loading
图 4 钢箱壁面破坏的数值模拟和实验对比
Figure 4. Comparison of steel box wall damage between numerical simulation and experiment
图 5 钢箱壁面挠度变化趋势
Figure 5. Deflection in the center of the steel box wall varying with time
图 6 钢箱内部爆炸过程中，壁面von Mises应力分布
Figure 6. Von Mises stress inside the steel wall during the explosion in the steel box
图 7 钢箱内部爆炸过程中，壁面的压力分布
Figure 7. Pressure distribution of the wall during the explosion in the steel box
图 8 钢箱壁面中心点处的速度变化趋势
Figure 8. Velocity varying with time at the wall center of the steel box
图 9 钢箱壁面中心点处的压强变化趋势
Figure 9. Pressure varying with time at the wall center of the steel box
图 10 钢箱中炸药位置示意图(a=60 mm)
Figure 10. The explosive location diagram in the steel box (a=60 mm)
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