A Numerical Simulation of the Assembled Flyers Driven by Two Head-on Colliding Detonation Waves
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摘要: 采用SG (Steinberg-Guinan)强度模型描述组合飞片(铅和铝)的动力学响应行为, 对两侧对称点起爆圆柱炸药、爆轰波对碰驱动组合飞片实验模型进行了数值模拟计算。得到了爆轰波对碰驱动组合飞片的计算图像, 并与实验结果进行了对比分析, 明确了SG强度模型对描述爆轰波对碰驱动下组合飞片的适用性, 为高应变率条件下材料强度模型的适应性研究奠定基础, 同时也为更好地理解材料在高应变率条件下的本构关系以及材料在对碰区的动力学行为提供参考。Abstract: A numerical calculation was carried out for the accelerated combined flyers by colliding explosive waves initiated by two symmetrical detonation initiators.In the calculation, Steinberg-Guinan (SG) strength model was used for the flyers to describe dynamic behaviors.From the calculation, the flying process and wave-propagating images were obtained.The results from our calculation are consistent with those from our actual measurements, demonstrating that the SG strength model is suitable for the combined flyers loaded with two head-on colliding explosive waves.This work lays a foundation for the study of suitability of the strength model at high strain rates and will serve as valuable reference for better understanding materials' constitutive relations and their dynamic behaviors in the colliding area.
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Key words:
- assembled plates /
- bulging of collision /
- strength model /
- numerical simulation
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图 2 起爆后不同时刻的压力云图
Figure 2. Pressure nephograms at different time points after ignition
图 3 不同时刻组合飞片(铅和铝)中的压力云图
Figure 3. Pressures undergone by the combined flyers (Pb and Al) at different time points
图 4 不同时刻铅飞片自由面的外形
Figure 4. 4 Outline of free surface of Pb flyer at different time points
图 6 自由面粒子速度历史比较
Figure 6. Measured and calculated velocities of the free surface particle
图 7 铅飞片对称轴上不同测点的速度历史
Figure 7. Profile of velocities at different gauge points on the symmetry axis of Pb flyer
表 1 铅飞片中不同时刻的马赫杆长度
Table 1. The length of Mach stem in Pb flyer at different time points
t/(μs) Length of Mach stem/(mm) 2.6 0 2.7 0.80 2.8 1.20 2.9 1.60 3.0 2.04 3.1 ─ 
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