Method for calculating small difference of fracture time of cylinder shell unloaded by detonation
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摘要: 对于断裂时刻差异较小的对比实验，提出一种判读方法：同时采用高速摄影和干涉测速，利用高速摄影判读壳体断裂时刻应变，利用干涉测速获取壳体位移及应变曲线，两者结合得出较为精确的壳体断裂时刻差异。利用该方法得出45钢柱壳在JO-9159和JOB-9003两种炸药加载下断裂时间相差0.45 μs，钨合金柱壳在两种炸药加载下的断裂时间相差0.39 μs。同时该方法可以推广应用于单发壳体膨胀断裂实验中，更精确测定壳体的断裂时刻。Abstract: One method is offered for calculating small difference of fracture time of cylinder shell in contrast experiments. The fracture strain of cylinder shell was measured by high-speed photography, and simultaneously the velocity-time curve and displacement-time curve were measured by Velocity Interferometer System. The difference of fracture time is calculated by two kinds of measurement results. The difference of fracture time of 45 steel cylinder shell unloaded by JO-9159 and JOB-9003 explosive is 0.45 μs, and the difference of fracture time of W alloy is 0.39 μs. The method can be used to measure more accurately the fracture time of cylinder shell unloaded by detonation.
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图 1 45钢柱壳速度及位移计算结果
Figure 1. Calculation results of velocity and displacement curves of the 45 steel cylinder shells
图 2 钨合金柱壳速度及位移计算结果
Figure 2. Calculation results of velocity and displacement curves of the W alloy cylinder shells
图 4 45钢柱壳速度及位移测试结果
Figure 4. Experiment results of velocity and displacement curves of the 45 steel cylinder shells
图 5 钨合金柱壳速度及位移测试结果
Figure 5. Experiment results of velocity and displacement curves of the W alloy cylinder shells
表 1 产物泄漏时间及应变
Table 1. Time and strain of resultant leakage
柱壳材料 主炸药 t/μs ε/% 45钢 JO-9159 13.3 83.1 45钢 JOB-9003 13.3 81.3 钨合金 JO-9159 12.0 53.8 钨合金 JOB-9003 12.0 51.3 
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表 2 起跳速度及应变率
Table 2. Leaping velocity and strain ratio
柱壳材料 主炸药 v1/(m·s-1) ˙ε1/s−1 45钢 JO-9159 1 267.0 3.73×104 45钢 JOB-9003 1 234.0 3.63×104 钨合金 JO-9159 723.6 2.13×104 钨合金 JOB-9003 718.4 2.11×104
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表 3 断裂时刻差异
Table 3. Difference of fracture time
柱壳材料 主炸药 ε/% t′/μs Δt/μs 45钢 JO-9159 82.2 13.17 0.45 45钢 JOB-9003 82.2 13.62 钨合金 JO-9159 52.6 12.73 0.39 钨合金 JOB-9003 52.6 13.12
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