Velocity Profile Measurement of a Flyer with Grooving Structure and Its Numerical Simulation
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摘要: 应用线、面结合激光速度干涉仪(VISAR)技术,对点爆散心爆轰产物驱动带沟槽飞片的自由面速度进行了实验测量,获得了飞片表面长12 mm的一条线上点的速度-时间历程,以及飞片起跳后1、3、5 μs 3个特定时刻飞片表面∅10 mm范围内速度的二维分布。同时用LS-DYNA对实验模型进行了数值模拟,所得结果与实验测量结果符合较好,表现出线、面结合VISAR技术在研究非均匀材料动态响应上的应用潜力。
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关键词:
- 激光速度干涉仪(VISAR) /
- 线成像 /
- 面成像 /
- 爆轰驱动
Abstract: The line-image VISAR was applied in a detonation experiment, in which a flyer with Zigzag trenches was driven by a divergent detonation wave.The free surface velocity of a 12 mm-long line on the flyer was obtained, and the velocity distribution on the free surface was also recorded at 1, 3, 5 μs after the free surface started moving.Finally, the experimental model was simulated using LS-DYNA program, the results are in good agree with the experimental results, which prove the potential of Line-Image VISAR in heterogeneous experiment. -
图 1 线-面VISAR系统结构图
1. Laser; 2.Electro-optic swith; 3.Beam expander; 4.Mirror; 5.Spherical lens; 6.Beam splitter; 7.Imaging lens; 8.Target; 9.Relay lens; 10, 11.Beam splitter; 12.Mirror; 13.Etalon; 14.Imaging lens; 15.Beam splitter; 16.Framing camera; 17.Scanning camera
Figure 1. Line-image VISAR system
表 1 炸药与飞片材料参数[10-11]
Table 1. Material parameters of explosive and flyer[10-11]
Material ρ/(g/cm3) DJ/(m/s) pJ/(GPa) A/(GPa) B/(GPa) R1 R2 ω E0 PETN 1.65 8134 28 753 19.1 5.00 1.78 0.3 0.112 Material A/(MPa) B/(MPa) n C m D1 D2 D3 D4 45 steel 507 320 0.28 0.064 1.06 0.72 1.66 0.005 -0.84 -
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