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采用多物质欧拉与拉格朗日耦合算法,对近地空中爆炸冲击波与柱形拱壳结构的相互作用进行数值模拟。分别采用刚性体材料和考虑应变率的塑性材料来模拟拱壳结构,研究目标在爆炸作用下的运动、变形、损伤及破坏对爆炸荷载分布的影响。数值模拟分析结果表明,拉格朗日-欧拉耦合算法较好地模拟了爆炸冲击波在介质中的传播和作用在结构上的爆炸荷载效应。拱壳结构的正面反射系数在2～8之间,且刚性壁面的反射效果明显高于塑性材料的反射;拱顶处会产生“涡流”效应,导致局部区域压力下降;冲击波的绕射系数都小于1,它产生的是一个稀疏效应,材料对稀疏效应的影响不明显,有待进一步研究。
The multi-matter Eulerian and Lagrangian coupling algorithm is used to simulate the interaction between the near-surface air blast shock wave and the cylindrical arch structure. The rigid shell material and the plastic material considering the strain rate are used to simulate the arch structure respectively and the influence of the movement, deformation, damage and damage of the target on the explosion load distribution is studied. Numerical simulation results show that the Lagrangian-Eulerian coupling algorithm simulates the propagation of blast shock waves in the medium and the structural explosive load effect. The frontal reflection coefficient of the arched shell structure is between 2 and 8, and the reflection effect of the rigid wall is obviously higher than that of the plastic material. The “vortex” effect at the vault causes the pressure drop in the local area. The diffraction of the shock wave The coefficients are all less than 1, it produces a sparse effect, the effect of the material on the sparse effect is not obvious, pending further study.