采矿与安全工程学报Issue(3)：401-407,7.
岩石试件SHPB劈裂拉伸试验中能量耗散分析
Energy dissipation analysis of stone specimens in SHPB tensile test
摘要
Abstract
Variable cross-section split Hopkinson pressure bar (SHPB) with a diameter of 50 mm is adopted to implement radial loading to the mine sandstone Brazilian disc, which has a thick-ness-diameter ratio of 0.5. Dynamic tensile tests at various loading rates are obtained by altering impact loading pressures. Through investigating energy composition and dissipation characteristics of sand-stone specimens during the dynamic tensile failure process, this paper tries to analyze the failure forms, average strain rate effect and dynamic tensile strength from energy dissipation perspective. It is found that energy absorbed by specimen mostly dissipates in the damage evolution and deformation failure process, which corresponds well to the tensile performance of sandstone under dynamic loads. The re-sults showed that tensile strength and absorbed energy increase logarithmically with the average strain rate, a remarkable strain rate correlation. The results can provide some reference for dynamic tensile performance research of rocklike brittle materials.关键词
岩石力学/巴西圆盘/分离式Hopkinson压杆(SHPB)/能量耗散/应变率效应Key words
rock mechanics/Brazilian disc/split Hopkinson pressure bar(SHPB)/energy dissipation/strain rate effect分类
矿业与冶金引用本文复制引用
平琦,马芹永,袁璞..岩石试件SHPB劈裂拉伸试验中能量耗散分析[J].采矿与安全工程学报,2013,(3):401-407,7.基金项目
安徽高校省级自然科学研究重点项目(KJ2013A085)；住房和城乡建设部科学技术项目(2012-K4-2)；安徽省建设行业科学技术计划项目(2012YF-20) （KJ2013A085）
