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Experimental Investigation of the Crater Caused by Hypervelocity Rod Projectile Impacting on Rocks

机译：超细杆抛射射流对岩石造成的火山口的实验研究

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To investigate the cratering effects of hypervelocity rod projectile impacting on rocks, a two-stage light gas gun was used to carry out 10 groups of small-scale experiments, whose velocity ranges from 1.5?km/s to 4.1?km/s. After each experiment, the morphology and size of the hypervelocity impacting crater were accurately obtained by using a device for image scanning. According to the morphology of the final crater, the impact crater can be divided into crushing area, spallation area, and radial crack area. Based on the experimental results of steel projectile vertical impacting on granite targets, the relationship between the depth and the diameter of the crater is analyzed, i.e., h/D≈0.1～0.2; it shows that the depth of the crater is much smaller than the diameter of the crater, and the crater seems to be a shallow dish. The relation between the kinetic energy of the projectile and the size of the crater was discussed. With the increase of the projectile kinetic energy, it is uncertain whether the depth of the crater increases, but the volume of the crater will increase. Lastly, dimensionless analysis of the impact crater was carried out. Specifically, the limitations of point source solutions to hypervelocity rod projectile impact cratering have been proved, and there is no essential difference to calculate the final crater by using the energy scale or the momentum scale.
机译：为了调查超细杆射弹对岩石的射击效果，两级轻气枪用于执行10组小规模实验，其速度范围为1.5 km / s至4.1 km / s。在每个实验之后，通过使用用于图像扫描的装置，精确地获得超细损伤撞击口的形态和大小。根据最终火山口的形态，冲击式陨石坑可分为破碎区域，散开区域和径向裂缝区域。基于钢射弹垂直影响花岗岩靶标的实验结果，分析了火山口的深度与直径之间的关系，即H /D≈0.1〜0.2;它表明，火山口的深度远小于火山口的直径，火山口似乎是浅盘。讨论了弹丸的动能与火山口的大小之间的关系。随着射弹动能的增加，不确定火山口的深度增加，但火山口的体积会增加。最后，进行了对冲击火山口的无量纲分析。具体而言，已经证明了点源解决方案对超高速杆抛射射击射击器的局限性，并且通过使用能量尺度或动量量表来计算最终火山口没有本质差异。

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