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| Energy dissipation analysis of concrete samples under impact loads of different high strain rates |
| Received:December 26, 2021 Revised:March 29, 2022 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx20211226001 |
| KeyWord:Hopkinson's experiment average crushing size incident energy material absorption energy average strain rate |
| Author | Institution |
| 王智德 |
武汉理工大学 土木工程与建筑学院, 武汉 |
| 李杰 |
武汉理工大学 土木工程与建筑学院, 武汉 |
| 武海港 |
武汉理工大学 土木工程与建筑学院, 武汉 |
| 司莹莹 |
武汉理工大学 土木工程与建筑学院, 武汉 |
| 熊文 |
武汉理工大学 土木工程与建筑学院, 武汉 |
| 吝曼卿 |
武汉工程大学 资源与安全工程学院, 武汉 ;磷资源开发利用教育部工程研究中心, 武汉 |
| 刘奇 |
中铁上海设计院上海先行建设监理有限公司, 上海 |
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| Abstract: |
| Facing the problem that the correlation between the energy dissipation of concrete material under shock load and its degree of fragmentation is difficult to determine,a concrete block impact test was completed based on the split Hopkinson pressure bar (SHPB),and through screening the fragments after impact and testing the strain during stress wave propagation,the rule of the energy dissipation and characteristics of the block is found.The results show that:(1) The loading time of incident stress wave is about 380 μs,and the incident energy,reflected energy and absorbed energy increase with the impact pressure; at the same impact pressure,the reflected energy is the first to reach equilibrium. (2) The higher the average strain rate is,the higher the incident energy and absorbed energy are.When the average strain rate is about 300/s,the energy utilization rate is the lowest. (3) With the increase of incident energy,failure of the rate of increase of the absorbed energy becomes larger and larger.The absorbed energy increases almost linearly as the incident energy reaches 2100 J. (4) With the increase of the impact pressure,failure of the specimen gradually changes from tensile to crushing,and with the increase of absorbed energy,the average crushing size becomes smaller and smaller.When the absorbed energy is greater than 700 J,the absorbed energy has little influence on the reduction of the average crushing size of the sample. |
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