Dynamic analysis of aircraft impacting on concrete structures
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摘要: 基于已有的飞机撞击混凝土结构的实验数据，利用有限元分析软件ANSYS/LS-DYNA，选用可模拟冲击作用下混凝土性能的4种不同材料模型，在同一接触算法、同一失效准则下，进行飞机撞击混凝土结构的数值模拟与动力学分析，探讨了4种混凝土材料模型在模拟飞机撞击下混凝土结构破坏效应的能力。结果表明：4种混凝土材料模型均能模拟飞机撞击混凝土结构的穿入、散裂、碎甲等局部破坏效应，但在考虑正、背面破坏面积及剩余速度等因素时，MAT072R3和MAT084材料模型的计算结果与实验结果较接近，MAT111材料模型次之，MAT159材料模型有较大的差异。本文的研究结果可为后续评估混凝土结构安全壳抵抗飞机撞击能力时提供基础参数。Abstract: We carried out the analysis of aircraft crashing on the concrete structures through numerical simulation and dynamic analysis using the matured software of ANSYS/LS-DYNA. The analysis uses the same contacting algorithm for four different material models and the results of damage effects are discussed in detail. The numerical simulation results are listed as follows. First, all of four material models can simulate the crashing process of penetration, spallation, and some other local damage effects. Second, if the damage is in front and back side, multiplying with velocity is considered, though the results of MAT072R3 and MAT084 are close to each other. The result of MAT111 is not very close to the previous two models. The model of MAT159 is significantly different from the results of 3 models mentioned above. The results of this research provide some basic parameters for subsequent evaluation of concrete structures resisting under aircraft impact.
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Key words:
- mechanics of explosion /
- impact of aircraft /
- material model /
- concrete structure /
- dynamic analysis
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图 1 飞机撞击钢筋混凝土的实验模型剖面示意图
Figure 1. Schematic section of experimental model of aircraft crashing on the concrete structures
图 2 飞机撞击混凝土结构的有限元网格划分模型
Figure 2. Finite element mesh model of aircraft crashing on reinforced concrete
表 1 飞机模型的材料参数和重量
Table 1. The parameters and the weight of aircraft model
部件 材料 E/GPa Y/MPa εf W/N 机身外壳 玻璃 6.37 82.3 0.013 81.3 机身填充物 高密度泡沫 2.28 0.6 0.10 129.4 引擎 钢 206 797.4 0.20 28.1 赫氏支撑轴 碳纤维板 0.168 12.9 ∞ 6.8 
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表 2 数值分析结果与实验结果的对比
Table 2. Comparison of numerical and the experimental results
模型 v0/(m·s-1) vr/(m·s-1) dp/cm Ab/(cm·cm) 机身 引擎 实验 142 110 80 33 50×55 MAT084 142 108 52 30 39×42 MAT159 142 10 5 24 18×27 MAT111 142 113 58 18 30×33 MAT072R3 142 113 68 30 42×42
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