ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
Citation:
JIAN Shihao, MIAO Chunhe, ZHANG Lei, SHAN Junfang, WANG Pengfei, XU Songlin. Fragmentation of Double Quartz Glass Spheres Subjected to Lower-Velocity Impact[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024202. doi: 10.11858/gywlxb.20200629
ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
Citation:
JIAN Shihao, MIAO Chunhe, ZHANG Lei, SHAN Junfang, WANG Pengfei, XU Songlin. Fragmentation of Double Quartz Glass Spheres Subjected to Lower-Velocity Impact[J]. Chinese Journal of High Pressure Physics, 2021, 35(2): 024202. doi: 10.11858/gywlxb.20200629
CAS Key Laboratory for Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China
2.
The United Laboratory of High-Pressure Physics and Earthquake Science, CEA Key Laboratory of Earthquake Prediction (Institute of Earthquake Science), China Earthquake Administration, Beijing 100036, China
By employing a split Hopkinson pressure bar (SHPB) device, the dynamic crushing experiments of quartz glass beads with diameters of 8.30, 11.68, 15.42 and 17.50 mm, were implemented with impact velocity of 5.6–11.5 m/s. High-speed photographing technology was used to record the crushing process of double glass beads during impact. Combined with the transmitted load-displacement curves and the results of particle size distribution analysis, the failure mechanism of quartz glass under double-particle impact was discussed. Due to the non-uniform load distribution in the double-particle system, the breakage of two glass beads demonstrated a time-varying characteristic, which changed with the increasing impact velocity. Despite of the conventional penetrating oblique crack system, the impact fracture of glass beads was caused by the local Hertz crack expansion and the crack system diffusion at the contact points. The fast infrared temperature measurement revealed two main fracture mechanisms and the existence of critical crushing diffusion resistance. This work has shown to be a significant reference for understanding the dynamic failure mechanism of brittle granular matter.
对于大多数透明材料,当压力达到几百吉帕甚至太帕量级时,冲击波后的状态为流体状态(声速等价于体声速),电介质会发生绝缘体金属相变或者处于电离状态,冲击波阵面表现出很高的反射率,速度干涉仪可以直接对冲击波速度进行测量[10]。在满足一维平面冲击加载条件下,通过靶的设计引入侧向稀疏波(声波),稀疏区域压力下降,受影响区域的冲击波速度下降,冲击波面在稀疏区发生弯曲。利用线成像VISAR(Velocity interferometer system for any reflector)测量冲击波阵面速度历史已经成为冲击动力学领域的常用手段,但是线成像VISAR携带的空间分辨能力却长期被忽略[9, 11]。当线成像VISAR的物镜参数f/D较大时,测量面微小的倾斜会使探测光的回光无法进入成像透镜,导致信号丢失,所以当引入侧向稀疏时,冲击波波阵面发生弯曲,弯曲部分在VISAR像面不会有反射信号,因而可以在记录系统中测到平面冲击波和弯曲冲击波的边界随时间的横向位移。该位移数据反映了冲击波后侧向小扰动的传播过程(声速),可与冲击波速度直接关联,进而获得主冲击绝热线上的连续声速变化曲线。更为详细的原理参考文献[9]。
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ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524
ZHANG Hongping, ZHANG Li, LUO Binqiang, LI Jianming, WANG Feng, TAN Fuli, LI Mu. High Precision Targets Fabrication for Sound Velocity Measurements in Terapascal Pressure[J]. Chinese Journal of High Pressure Physics, 2020, 34(3): 033401. doi: 10.11858/gywlxb.20200524