中南大学学报（自然科学版）2026，Vol.57Issue(2)：744-759,16.DOI:10.11817/j.issn.1672-7207.2026.02.021
循环冲击下磁铁富矿矿石力学特性与响应机理
Mechanical properties and response mechanisms of magnetite rich ore under cyclic impact
摘要
Abstract
To clarify the response of magnetite rich ore under cyclic dynamic load disturbances,cyclic impact tests with varying impact velocities were conducted on magnetite rich ore specimens by using a split Hopkinson pressure bar(SHPB)system and digital image correlation(DIC)technology.The impact velocities for the SHPB tests were 8 m/s(Group A),10 m/s(Group B),12 m/s(Group C),14 m/s(Group D),16 m/s(Group E),and 18 m/s(Group F).The dynamic stress-strain curves,strain rate evolution patterns,energy absorption characteristics,fractal mechanisms of failure,and surface strain contours were analyzed.The results show that for specimens in Groups A and B,fatigue damage is not significant,with fractal dimensions of 1.79 and 1.95,respectively,after cyclic impact.For specimens in Group C,fatigue damage is primarily characterized by tensile failure occurring in the distant zone,with a fractal dimension of 2.74 after cyclic impact.For specimens in Groups D,E,and F,fatigue damage is mainly dominated by compressive-shear failure occurring in the near zone,accompanied by tensile failure in the distant zone,with fractal dimensions of 2.95,2.82,and 3.17,respectively,after cyclic impact.There exists a plastic deformation stage prior to elastic deformation when magnetite rich ore is subjected to impact,during which the specimens experience dilatancy.The dynamic tensile strength varies with the competition between dilatancy and microcrack propagation.A distinct"threshold effect"is observed in the failure behavior of magnetite rich ore under cyclic impact,which is related to the incident energy.Moreover,the total absorbed energy of the specimens tends to saturate under cyclic impact.The surface shear strain contours of magnetite rich ore exhibit regularity at different impact velocities,and the influence of dilatancy cannot be neglected during the impact process of magnetite rich ore.关键词
磁铁矿富矿/循环冲击荷载/力学特性/破坏响应机理/数字图像相关技术Key words
magnetite rich ore/cyclic impact loading/mechanical properties/failure response mechanism/digital image correlation technology分类
数理科学引用本文复制引用
张钧鹏,左进京,鲁军纪,赵勇,刘朕,范子儀,柴青平,陈宏灏,齐立伟..循环冲击下磁铁富矿矿石力学特性与响应机理[J].中南大学学报（自然科学版）,2026,57(2):744-759,16.基金项目
国家自然科学基金资助项目(52208384) （52208384）
非煤露天矿山安全智能开采国家矿山安全监察局重点实验室重点专项课题(2024-K13)(Project(52208384)supported by the National Natural Science Foundation of China （2024-K13）
Project(2024-K13)supported by Key Special Research Project of the Key Laboratory for Safe and Intelligent Mining in Non-coal Open-pit Mines,National Mine Safety Administration) （2024-K13）
