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不同高应变率冲击荷载作用下混凝土试样的能量耗散分析
Energy dissipation analysis of concrete samples under impact loads of different high strain rates
投稿时间:2021-12-26  修订日期:2022-03-29
DOI:
中文关键词:  霍普金森试验  平均破碎尺寸  入射能  材料吸收能  平均应变率
英文关键词:Hopkinson’s experiment  Average crushing size  Incident energy  Material absorption energy  Average strain rate
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目),武汉市城乡建设委员会科技计划项目,磷资源开发利用教育部工程研究中心开放基金
作者单位邮编
王智德 武汉理工大学 430070
李杰 武汉理工大学 
武海港 武汉理工大学 
司莹莹 武汉理工大学 
熊文 武汉理工大学 
吝曼卿 武汉工程大学 
刘奇 中铁上海设计院上海先行建设监理有限公司 
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中文摘要:
      针对混凝土材料在冲击荷载作用下能量耗散和破碎程度关联性难确定的问题,采用分离式霍普金森压杆(SHPB)完成了混凝土试块冲击试验,通过对冲击后碎块的筛分试验和应力波传播过程中应变的测试,得到了试块的能量耗散规律和试样破碎特征。结果表明:①入射应力波的加载时间约为380μs,入射能、反射能和吸收能随冲击气压的增大而增大;同一气压下,反射能最早达到平衡。②平均应变率越大,入射能和吸收能也越大;当平均应变率为300/s左右时,能量利用率为最低值;③随着入射能的增加,吸收能的增长率越来越大,当入射能达到2100J时,吸收能近乎线性增长;④随冲击气压增大,试样由拉裂破坏逐渐转移为压碎破坏,且随着材料吸收能的增大,平均破碎尺寸越来越小。当吸收能大于700J时,吸收能对试样的平均破碎尺寸减小的影响较小。
英文摘要:
      In view of the concrete material under shock load energy dissipation and broken degree correlation is difficult to determine, with the help of the split hopkinson pressure bar (SHPB), concrete block impact test, through the screening test of debris after impact tests of strain and stress wave propagation, get the rule of the energy dissipation of the block and sample characteristics. The results show that: ①The loading time of incident stress wave is about 380μs, and the incident energy, reflected energy and absorbed energy increase with the increase of impact pressure; At the same air pressure, the reflected energy is the first to reach equilibrium. ②The higher the average strain rate is, the higher the incident energy and absorption energy are. When the average strain rate is about 300/s, the energy utilization rate is the lowest. ③with the increase of incident energy, the rate of increase of absorbed energy becomes larger and larger. The absorbed energy increases almost linearly as the incident energy reaches 2100J. ④With the increase of the impact pressure, the specimen gradually changes from tensile failure to crushing failure,and with the increase of absorbed energy, the average crushing size becomes smaller and smaller. When the absorption energy is greater than 700J, the absorption energy has little influence on the reduction of the average crushing size of the sample.
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