Impulsive Resistance of Metallic Honeycomb Sandwich Structures Subjected to Underwater Impulsive Loading
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摘要: 为揭示高强度水下爆炸冲击载荷作用下金属夹芯结构的抗冲击性能，在实验室开展小尺寸水下爆炸加载技术对金属蜂窝夹芯结构性能影响的实验研究。基于实验结果，开展了全尺寸数值模拟金属蜂窝夹芯结构在水下冲击载荷作用下的动态响应和抗冲击性能研究。结果表明，数值模拟、实验和理论模型计算的结果具有良好的一致性。由于蜂窝芯材相对密度对夹芯结构能量耗散方式和载荷传递机制的影响，结构动态响应、失效模式以及抗冲击性能随着冲击强度的变化表现出较为明显的不同。通过抗冲击参数分析，建立了反映金属蜂窝夹芯结构抗冲击性能的结构横向变形、固支反力、透射脉冲和塑性能耗随冲击强度和芯材相对密度变化的结构-载荷-性能量化关系。Abstract: To investigate the blast-resistant performance of metallic sandwich structures subjected to intensive underwater impulsive loading, the lab-scaled underwater explosive simulator is employed to conduct water-based impulsive loading on metallic honeycomb sandwich structures. Based on the completed experimental study, this paper conducts a numerical investigation on the dynamic response and blast resistance of the metallic honeycomb sandwich structures subjected to intensive underwater impulsive loading. The results show that the comparison among the numerical simulation, experiments, and analytical solutions shows a good agreement in terms of dynamic response and transverse deflections. For the different honeycomb sandwich with identical thickness, the dynamic responses, failure modes, and blast-resistant performances of sandwich panels are shown different characteristics due to the energy absorption and loading transferring caused by the relative core densities. The impulsive resistance in terms of dynamic deformation, transverse deflection, reaction force, transmitted impulse and plastic energy dissipation is evaluated in relation to the load intensity and the relative core density. Quantitative structure-load-performance relation is carried out to facilitate the advanced study on the structures and provides guidance for structural design.
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图 1 高强度水下冲击加载实验装置示意图（a）和数值分析模型（b）
Figure 1. Intensive underwater explosive simulator (a) and the numerical model (b)
图 2 蜂窝夹芯结构准静态压缩下的应力-应变关系
Figure 2. Stress-strain relationship compression of honeycomb sandwich structure under quasi-static compression
图 3 实验和数值模拟的失效模式对比
Figure 3. Comparison of the deformation modes obtained from the simulation and experiment
图 4 蜂窝夹芯结构背板中点变形时程曲线（a）和最大变形与冲击强度的关系（b）
Figure 4. Mid-point deflection history of honeycomb sandwish structure (a) and relationship between impulsive intensities and maximum deflection (b)
图 5 蜂窝夹芯结构在
${10^3}{\overline I _{\rm{t}}}$ = 3.58作用下的等效应变分布和塑性铰运动Figure 5. Dynamic deformation and propagation of plastic hinges of the honeycomb sandwich，
${10^3}{\overline I _{\rm{t}}} $ = 3.58
图 6 蜂窝夹芯结构前后面板中点的速度响应过程
Figure 6. Velocity time history at the mid-point of front and back face-sheet of honeycomb sandwich structure
图 7 相同冲击强度下不同芯材相对密度的蜂窝夹芯结构等效应力分布
Figure 7. Equivalent strain distribution of honeycomb sandwich under the same impact loading
图 8 蜂窝夹芯结构横向变形与冲击强度及芯材相对密度的关系
Figure 8. The relationship of transverse deflections for honeycomb sandwich structure load intensity and relative core density
图 10 夹芯结构透射脉冲强度与冲击强度及几何特性的关系
Figure 10. Relationship of transmitted impulses to incident impulse intensity and geometries
图 11 蜂窝夹芯结构各部分的塑性能耗时程曲线(a)及塑性能耗与冲击强度和芯材相对密度关系(b)
Figure 11. Plastic dissipation histories at different places of honeycomb sandwich structure (a) and the relationship of plastic dissipations to incident impulse intensity and relative core density (b)
表 1 面板和芯材材料力学性能参数
Table 1. Mechanical parameters of aluminum materials
Materials Young’s modulus/GPa Density/(kg·m−3) Parameters A/MPa B/MPa C n 5A06 aluminium alloy 74.0 2 780 167.0 443.7 0.020 0.44 3003 aluminium alloy 74.2 2 700 85.2 170.0 0.038 0.44 
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表 2 Mie-Grüneisen状态方程参数
Table 2. Parameters for the Mie-Grüneisen equation of state
Density/(kg·m−3) Sound speed in water/(m·s−1) γ 1 000 1 106 0.05
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