论文标题
一种针对倾斜颗粒层倾斜影响的新型实验设置
A novel experimental setup for an oblique impact onto an inclined granular layer
论文作者
论文摘要
我们开发了颗粒状冲击实验的原始设备，通过该设备可以系统地改变固体弹丸的入射角和目标颗粒层的倾斜角。尽管大多数自然壁壁事件发生在具有各种入射角的倾斜表面上，但尚无对倾斜靶向表面的倾斜影响进行任何实验。为了进行系统的影响实验，必须开发一种新型的实验仪。因此，我们为撞击实验构建了一个设备，在该设备中，入射角和倾斜角都可以独立变化。弹丸注射单元加速了塑料球（直径为6〜mm），最高$ v_i \ simeq 100 $ 〜m〜s $^{ - 1} $影响速度。注射单元的枪管由三维打印机制成。高速摄像头捕获了冲击动力学，以直接测量冲击速度和入射角。还测量了弹丸的反弹动力学（恢复系数和反弹角）。最终的火山口形状是使用安装在电阶段上的线圈剖面的测量。通过使用该系统扫描表面，可以构建三维火山口形状（高度图）。根据测得的结果，我们可以定义和测量火山口的特征数量。恢复动力学的分析结果作为使用开发系统进行系统实验的示例。
We develop an original apparatus of the granular impact experiment by which the incident angle of the solid projectile and inclination angle of the target granular layer can be systematically varied. Whereas most of the natural cratering events occur on inclined surfaces with various incident angles, there have not been any experiments on oblique impacts on an inclined target surface. To perform systematic impact experiments, a novel experimental apparatus has to be developed. Therefore, we build an apparatus for impact experiments where both the incident angle and the inclination angle can be independently varied. The projectile-injection unit accelerates a plastic ball (6~mm in diameter) up to $v_i\simeq 100$~m~s$^{-1}$ impact velocity. The barrel of the injection unit is made with a three-dimensional printer. The impact dynamics is captured by high-speed cameras to directly measure the impact velocity and incident angle. The rebound dynamics of the projectile (restitution coefficient and rebound angle) is also measured. The final crater shapes are measured using a line-laser profiler mounted on the electric stages. By scanning the surface using this system, a three-dimensional crater shape (height map) can be constructed. From the measured result, we can define and measure the characteristic quantities of the crater. The analyzed result on the restitution dynamics is presented as an example of systematic experiments using the developed system.
