爆炸与冲击2025，Vol.45Issue(9)：87-104,18.DOI:10.11883/bzycj-2024-0309
动荷载下硅砂的破碎特性及吸能效应试验研究
Experimental study on crushing characteristics and energy absorption effect of silica sand under dynamic loading
摘要
Abstract
This study investigates the response characteristics of silica sand under dynamic loading,employing a modified split Hopkinson pressure bar(SHPB)to gain insights into its crushing behavior and energy absorption properties.Four distinct grain size(2.5-5.0 mm,1.25-2.50 mm,0.60-1.25 mm,and＜0.3 mm)were analyzed,with results demonstrating that the dynamic stress-strain behavior of silica sand is affected by both grain size and strain rate.The deformation process of silica sand is categorized into four stages:elastic,yielding,plastic and unloading.Plastic compaction is dominant during the yielding stage,whereas crushing compaction prevails in the plastic stage.The relative breakage of particles shows a positive correlation with both strain rate and effective particle size,and an inverse correlation with fractal dimension.The impact of particle size on energy absorption efficiency is influenced by factors such as mineral composition,particle size,and differentiation degree.Under identical stress levels,larger particle sizes demonstrate greater energy absorption efficiency;similarly,under identical loading strain rates,larger particles exhibit lower peak stress.To improve sand's energy absorption efficiency and reduce required loading levels,sand with larger particle sizes is recommended.关键词
硅质砂/分离式霍普金森杆/分形破碎特征/吸能效应Key words
silica sand/split Hopkinson pressure bar/fractal crushing characteristics/energy absorption effect分类
数理科学引用本文复制引用
崔鹏,罗刚,刘乐,曹芯芯,李邦翔,梅雪峰..动荷载下硅砂的破碎特性及吸能效应试验研究[J].爆炸与冲击,2025,45(9):87-104,18.基金项目
国家自然科学基金(52309137,42277143) （52309137,42277143）
国家重点研发计划(2022YFC3005704) （2022YFC3005704）
四川省自然资源厅科技项目(KJ-2023-004) （KJ-2023-004）
山东省自然科学基金(ZR2021QE209) （ZR2021QE209）
