Single and Multiple Dynamic Impacts Behaviour of Ultra-high Performance Cementitious Composite  

作　　者：张文华 张云升 

机构地区：[1]Department of Materials Science and Engineering,Jiangsu Key Laboratory of Construction Materials,Southeast University

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2011年第6期1227-1234,共8页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China(51178106);the Doctoral Program of Higher Education of China(20100092110029);the Key Laboratory of Urban and Architectural Heritage Conservation,Ministry of Education,Southeast University

摘　　要：Single and multiple dynamic impacts tests were conducted on ultra-high performance cementitious composite （UHPCC） with various volume fractions of steel fibers （0, 1%, 2%, 3%, 4%） by using the split hopkinson pressure bar （SHPB）. Besides, the ultrasonic velocity method was used to test the damage on specimens caused by dynamic impacts. For single dynamic impact, the data suggest that UHPCC obviously presents dynamic strength enhancement. With increasing of strain rate, the peak stress and peak strain increase rapidly. For multiple dynamic impacts, the results show that addition of steel fibers can obviously enhance the properties of UHPCC to resist the repeated dynamic impacts. Firstly, the number of impacts sharply increases with the increasing of volume fraction of steel fibers. Secondly, the energy absorption ability linearly increases with addition of steel fibers. Thirdly, the steel fibers can prevent the disruption phenomenon and maintain the integrity of specimen.Single and multiple dynamic impacts tests were conducted on ultra-high performance cementitious composite （UHPCC） with various volume fractions of steel fibers （0, 1%, 2%, 3%, 4%） by using the split hopkinson pressure bar （SHPB）. Besides, the ultrasonic velocity method was used to test the damage on specimens caused by dynamic impacts. For single dynamic impact, the data suggest that UHPCC obviously presents dynamic strength enhancement. With increasing of strain rate, the peak stress and peak strain increase rapidly. For multiple dynamic impacts, the results show that addition of steel fibers can obviously enhance the properties of UHPCC to resist the repeated dynamic impacts. Firstly, the number of impacts sharply increases with the increasing of volume fraction of steel fibers. Secondly, the energy absorption ability linearly increases with addition of steel fibers. Thirdly, the steel fibers can prevent the disruption phenomenon and maintain the integrity of specimen.

关 键 词：UHPCC SHPB dynamic behavior multiple impacts 

分 类 号：TB332[一般工业技术—材料科学与工程]