Characterizing detonation-induced micro-jetting by using step signal electric probe
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摘要: 针对目前缺乏用于狭小测试空间复杂结构金属样品的微喷现象诊断技术的现状，探索使用阶跃信号电探针诊断爆轰加载下金属样品微喷现象的方法。设计阶跃信号电探针测试技术，开展仿真验证电探针在微喷物质导通下K+RX模式的放电机理。在爆轰微喷实验中通过电探针信号观察到准连续状态微喷区及其存在的两种动作演化过程：阶梯放电曲线表征微喷物质随靠近后界面密度逐步增加，多次放电现象表征微喷物质从连续状态拉升变为离散状态。采用微射流模型描述准连续状态微喷区物质状态，通过电平曲线计算出被测物质等效电阻，再通过等效电阻计算微射流的等效尺寸，从而可描述准连续状态微喷区物质的密度。Abstract: There is a lack in technology that is suitable for characterizing the shock-induced micro-jetting of metal sample with complex configuration. In this work, step signal electric probe is developed to characterize micro-jetting. The probe is designed by numerical simulation and the discharging mechanism (K+RX model) of probe caused by micro-jetting is also verified by simulation. Quasi-continuous micro-jetting region can be directly observed on the probed signal and two kinds of dynamic processes exist: density increasing and pulling-extending to discrete state. The mass in quasi-continuous micro-jetting region is described by micro-jetting model, the equivalent size of micro-jetting is calculated based on the equivalent resistance that is obtained from the voltage signal. Thus the density of the quasi-continuous micro-jetting is obtained.
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Key words:
- detonation /
- micro-jetting /
- quasi-continuous /
- step signal electric probe
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