双石英玻璃珠的低速冲击破碎行为  

Fragmentation of Double Quartz Glass Spheres Subjected to Lower-Velocity Impact

作　　者：简世豪 苗春贺 张磊[1] 单俊芳[1] 王鹏飞[1] 徐松林[1,2] JIAN Shihao;MIAO Chunhe;ZHANG Lei;SHAN Junfang;WANG Pengfei;XU Songlin(CAS Key Laboratory for Mechanical Behavior and Design of Materials,University of Science and Technology of China,Hefei 230027,Anhui,China;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)

机构地区：[1]中国科学技术大学中国科学院材料力学行为和设计重点实验室,安徽合肥230027 [2]中国地震局地震预测研究所高压物理与地震科技联合实验室,北京100036

出　　处：《高压物理学报》2021年第2期78-87,共10页Chinese Journal of High Pressure Physics

基　　金：高压物理与地震科技联合实验室开放基金(2019HPPES01);国家自然科学基金(11672286,11872361,11602267)。

摘　　要：应用分离式霍普金森压杆(SHPB)加载装置,对直径为8.30、11.68、15.42、17.50 mm的石英玻璃珠开展了冲击速度为5.6~11.5 m/s的双玻璃珠系动态破碎实验。利用高速摄影技术记录双玻璃珠在动态冲击下的破碎过程,结合透射载荷-位移曲线以及破碎产物的粒度分析结果,探讨了石英玻璃双颗粒在冲击下的破坏机制。结果表明:由于双颗粒系中载荷的不均匀特性,两个玻璃珠的破碎具有时序特征,随冲击速度的增加而改变;玻璃珠的冲击破碎源于接触部位局部的Hertz裂纹扩张和裂纹系的扩散,而不是通常认为的贯穿性的斜裂纹体系;瞬态红外测温揭示了玻璃珠冲击破碎的两种主要机制和临界破碎扩散阻力的存在。研究结果对认识脆性颗粒介质的动态破坏机制具有良好的参考意义。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.

关 键 词：冲击动力学 石英玻璃 高速摄影 粒度分布 破碎 

分 类 号：O346.13[理学—固体力学]