The normal and oblique impact of three types of wet granules
The normal and oblique impact of three types of wet granules
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DOI：
10.1007/s10035-011-0256-5
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发表时间：
2011-03
期刊：
影响因子：
2.4
通讯作者：
P. Mueller;S. Antonyuk;M. Stasiak;J. Tomas;S. Heinrich
中科院分区：
文献类型：
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作者：
P. Mueller;S. Antonyuk;M. Stasiak;J. Tomas;S. Heinrich
对淬火钢板进行了冲击试验，得到了三种球形颗粒的恢复系数。选择了以弹性为主的γ-Al_2O_3、弹塑性为主的4A沸石和以塑性为主的苯甲酸钠作为颗粒样品。已经建立了一个电磁炮来加速颗粒并测量法向恢复系数。通过改变颗粒的含水率，使孔隙饱和度在S=0-1之间变化，从而确定含水率对法向恢复系数的影响。在自由落体装置上，冲击角在ΘA=0-80°范围内变化，研究了自由落体的切向恢复系数。用高速数码相机记录了撞击和反弹的过程。相机的记录频率在每秒4000到8000帧之间变化。
Impact tests against a hardened steel plate have been carried out to obtain the coefficient of restitution of three types of spherical granules. The dominant elasticγ-Al2O3, the elastic-plastic zeolite 4A and the dominant plastic sodium benzoate have been chosen as granule samples. An electromagnetic canon has been constructed to accelerate the granules and to measure the normal coefficient of restitution. The moisture content of the granules has been varied so that the pore saturation ranges between of S = 0–1. Thereby, the influence of the moisture content on the normal coefficient of restitution could be determined. A free fall apparatus, on which the impact angle is changeable in the range of ΘA= 0–80°, has been used to investigate the tangential coefficient of restitution. A high speed digital camera has been used to record the events of impact and rebound. The record frequency of the camera has been varied between 4,000 and 8,000 frames per second.