Experimental study of quantitative diagnosis of metal crack jet under explosive load
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摘要: 爆轰加载下金属飞片缝隙处会有射流产生，金属缝隙射流的喷射速度可达数千米/秒，而其射流线密度只有几个mg/cm量级。采用高速摄影以及脉冲软X光照相方法对缝隙射流进行了动态观测和(半)定量测量，通过不同条件下的系列实验获得了金属射流喷射特性和射流质量随飞片材料、加载压力、缝隙宽度以及加载方式等的变化规律，通过实验数据分析拟合，初步给出了射流质量随各影响因素变化的经验型定标率模型。Abstract: Under an explosive load a jet, composed by the local melted metal, would be generated and ejected from the crack of a metal plate, whose velocity may reach several kilometers per second while whose mass can only reach several milligrams per centimeter in magnitude. In the present work, high-speed photography and pulse soft X-ray radiography were used to diagnose the jet in the crack for its dynamic behavior and qualitative and quantitative measurement. A series of experiments were conducted considering different factors which include the plate material, the pressure and mode of the explosive load, the width of the crack, and the data of the jet properties and the jet mass were obtained. Based on the analysis of the experiment data, an empirical model was proposed which characterizes the jet mass varying with those different factors.
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Key words:
- mechanics of explosion /
- scale law /
- explosive load /
- crack jet /
- jet mass
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图 4 缝隙射流的典型动态X光照片(0.05 mm间隙)
Figure 4. Dynamic X-photograph of crack jet (crack width: 0.05 mm)
图 5 滑移爆轰加载分幅及X光实验照片
Figure 5. Framed photo and X-ray radiography photo of typical time under slipping explosive load
图 6 射流质量随加载压力变化曲线(0.05 mm间隙)
Figure 6. Curves of jet mass varying with explosive load pressure (crack width: 0.05 mm)
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