A novel auxetic broadside defensive structure for naval ships
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摘要: 提出一种具有宏观负泊松比效应的新型蜂窝舷侧防护结构，通过对负泊松比效应蜂窝胞元特殊结构构型设计，实现中等弹速下良好抗爆抗冲击性能。利用有限元动力学分析软件，研究鱼雷或导弹水下对舷侧防护结构的撞击侵入和穿透过程，对比研究了不同蜂窝构型、材料、胞元尺寸和胞壁厚度对舷侧结构抗冲击性能的影响。结果表明，蜂窝防护结构具有良好的抗冲击性能，负泊松比蜂窝构型较正泊松比蜂窝构型抗冲击性能更优。Abstract: Broadside defensive structure is important for naval vessels to maintain vitality. A novel broadside defensive structure with macro negative Poisson's ratio is proposed to achieve higher anti-shock and anti-blast performance by design of auxetic honeycomb configuration. The process of an anti-ship missile impinging on and penetrating broadside structure is simulated by nonlinear finite element software. Effects of different design parameters on broadside structure, like auxetic honeycomb configurations, materials, sizes and thickness of honeycomb cell, are studied and compared. Numerical results indicate that counter-impingement capacity can be improved by adoption of auxetic broadside structure, and honeycomb cell with negative Poisson's ratio is better than that of common honeycomb cell on anti-blast performance.
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图 1 负泊松比蜂窝结构舷侧防护几何模型及有限元模型
Figure 1. Geometry and FEM model of defensive structure with re-entrant honeycomb
图 2 正、负泊松比效应蜂窝夹芯舷侧防护结构(局部)示意图
Figure 2. Defensive structure with honeycomb and re-entrant honeycomb (local)
图 5 不同胞元层数下舷侧结构破损图
Figure 5. Crevasse shapes of auxetic defensive structure with different layers of honeycomb cell
表 1 材料参数
Table 1. Material parameters of 45 steel, TC4 and 921 steel
材料 基本参数 E/GPa ν ρ/(kg·m-3) Tm/K Tr/K 45钢 200 0.30 7 820 1 783 293 TC4 113 0.33 4 510 1 920 293 921钢 200 0.30 7 830 1 763 293 材料 Johnson-Cook本构模型参数 A/MPa B/MPa C n m 45钢 507 320 0.064 0.280 1.06 TC4 1 130 250 0.032 0.200 1.00 921钢 898 356 0.022 0.586 1.05 材料 Johnson-Cook失效模型参数 D1 D2 D3 D4 D5 45钢 0.1 0.76 1.57 0.005 -0.84 TC4 0 0.33 0.48 0.004 3.90 921钢 0.8 2.10 0 0.002 0.60 
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表 2 弹体剩余速度
Table 2. Residual velocity of missiles
蜂窝构型 h/mm 蜂窝材料 vr/(m·s-1) v0=80 m·s-1 v0=200 m·s-1 v0=300 m·s-1 5 45钢 0 131 249 8 45钢 0 110 239 正泊松比 10 45钢 0 90 236 5 921钢 0 74 236 5 TC4 0 101 253 5 45钢 0 125 241 8 45钢 0 103 227 负泊松比 10 45钢 0 86 208 5 921钢 0 71 240 5 TC4 0 80 252 常规防护结构 5 45钢 0 128 231
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表 3 不同胞元层数下弹体剩余速度对比
Table 3. Residual velocity of missiles with different cell layers
N vr/(m·s-1) v0=80 m·s-1 v0=200 m·s-1 v0=300 m·s-1 2 0 0 254 3 0 0 253 5 0 29.5 258
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