郑州大学学报（理学版）2019，Vol.51Issue(1)：107-112,6.DOI:10.13705/j.issn.1671-6841.2018012
冲击载荷下赤铁矿动态抗压强度及破碎特性
Hematite′s Dynamic Compressive Strength and Crushing Features under Impact Load
摘要
Abstract
Based on continuous discontinuous element method ( CDEM), by introducing linear elastic model for elements and cohesive model for virtual interfaces, the simulation of damage and fracture process of rock mass under the applied load was realized. Based on the basic principle of split Hopkinson pressure bar ( SHPB) experiment, a numerical sample of hematite with the diameter 50 mm and thickness 25 mm was established. With CDEM, five loading conditions with the strain rate 40, 80, 120, 160, 200 s-1 were discussed. The dynamic constitutive curves, dynamic uniaxial compressive strength, energy consumption density, fracture degree, and characteristic size of fragment were analyzed, and the results obtained by CDEM were more or less the same as those gotten by SHPB experiment. Although strain rate effect was not considered into constitutive laws of elements and virtual interfaces, the dynamic uniaxial compressive strength of numerical specimen still presented strong strain rate dependence. With the in-crease of strain rate loaded, the dynamic strength increased from 277 MPa to 310 MPa in power function form; and the energy consumption density for the damage and fracture increased. The energy consumption density was closely related to fracture degree and characteristic size of fragment.关键词
应变率/能耗密度/动态强度/破裂度/特征破碎尺寸Key words
strain rate/energy consumption density/dynamic strength/fracture degree/characteristic size of fragment分类
建筑与水利引用本文复制引用
冯春,张俊红,张群磊,乐金朝..冲击载荷下赤铁矿动态抗压强度及破碎特性[J].郑州大学学报（理学版）,2019,51(1):107-112,6.基金项目
国家重点研发计划项目(2016YFC0801603) （2016YFC0801603）
广东宏大爆破股份有限公司"基于数字模拟的露天爆破设计软件"研发项目 （）
鞍钢矿业集团"基于采选总成本的爆破技术优化研究"项目(2016-科A07-2). （2016-科A07-2）
