Numerical Analysis of Typical Aircraft Wing Structure Damaged by Explosion Impact
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摘要: 基于经验证的ALE建模方法，通过LS-DYNA有限元软件建立典型飞机机翼爆炸冲击毁伤模型，分析爆炸当量、爆炸间距以及爆炸方位等对典型飞机机翼在爆炸冲击波毁伤下的影响。结果表明：在爆炸冲击波作用下，蒙皮首先出现局部凹陷变形，随后变形程度迅速扩大，但内部长桁/翼肋结抑制沿蒙皮变形，随蒙皮进一步变形，在长桁/翼肋交接处产生初始撕裂裂纹，并迅速扩展；爆炸当量、爆炸距离和爆炸方位等对机翼的损伤范围及损伤模式都有较大的影响；随着TNT当量增加/爆炸距离减小，机翼蒙皮越早产生变形，且变形程度越大；爆炸点位于机翼前侧，导致机翼前缘结构大变形，影响气动特性；爆炸点位于机翼后侧，可能导致操纵面失效。Abstract: Based on the validated ALE modeling method, a typical aircraft wing damage model was established by LS-DYNA. The effects of explosion equivalent, distance and direction of explosion point on typical aircraft wing under blast wave damage were analyzed. The results show that the skin first appears local concave deformation under the action of explosion shock wave, and then expands rapidly; but the inner stringer/wing rib knot inhibits the deformation; with the further deformation of the skin, the initial tearing crack appears at the junction of the stringer and wing rib. The damage range and mode of the wing are greatly affected by explosion equivalent, explosion distance and explosion direction. And with the increase of TNT equivalent or the decrease of explosion distance, the earlier and the greater the deformation will be. When the explosion point is located in the front of the wing, the wing has a large deformation on the leading structure which affects the aerodynamic characteristics. When the explosion point is located at the back of the wing, it may lead to the failure of the control surface.
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Key words:
- shock dynamics /
- explosion shock /
- ALE method /
- structural strength
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表 2 TNT材料参数
参数名称 数值及
单位参数名称 数值及
单位密度ρ 1580 kg/m3 EOS系数ω 0.3 爆轰波速D 6900 m/s EOS系数R1 4.15 Chapman-Jouget
压力PCJ2.1 × 1010 Pa EOS系数R2 0.95 EOS系数A 3.71 × 1011 Pa 初始内能E0 7 × 109 J EOS系数B 3.2 × 109 Pa 相对体积V0 1 
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表 3 靶板材料参数
密度ρ/（kg·m−3） 弹性模量E/Pa 泊松
比 $\nu $屈服极限σs/Pa 切线模量Et/Pa 7830 2.06 × 1011 0.3 2.35 × 108 5 × 108
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表 4 机翼材料参数
参数名称 数值及
单位参数名称 数值及
单位密度ρ 2780 kg/m3 J-C本构参数Tm 933 K 弹性模量E 7.1 × 109 Pa J-C本构参数Tr 300 K 泊松比ν 0.3 J-C失效参数D1 0.13 J-C本构参数A 3.69 × 108 Pa J-C失效参数D2 0.13 J-C本构参数B 6.84 × 108 Pa J-C失效参数D3 −1.5 J-C本构参数n 0.73 J-C失效参数D4 0.011 J-C本构参数C 0.0083 J-C失效参数D5 0 J-C本构参数m 1.7
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表 5 蒙皮变形尺寸
TNT当量/kg 上部蒙皮/mm 下部蒙皮/mm 长 宽 长 宽 0.20 265.4 192.1 − − 0.55 442.8 430.0 118.5 105.1 0.80 563.2 495.5 478.6 435.0
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