The energy evolution characteristics of coal under different dynamic strain rates and confining pressures
Coal specimens from baijiao coal mine were impacted by a split Hopkinson pressure bar to study its dynamic mechanical behavior under different confining pressures (0-12 MPa) and different strain rates (20-250 s-1). The performances and the energy evolution characteristics of the coal specimens were...
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VINCA Institute of Nuclear Sciences
2019-01-01
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doaj-7ba4d46b125f41108f9c81418bd9bf632021-01-02T04:20:06ZengVINCA Institute of Nuclear SciencesThermal Science0354-98362019-01-01233 Part A1409141610.2298/TSCI180810205L0354-98361900205LThe energy evolution characteristics of coal under different dynamic strain rates and confining pressuresLu Yi-Qiang0Liu Xiao-Hui1Xie Jing2He Zhi-Qiang3Li Cong4State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, ChinaKey Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University, Chengdu, China + State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, ChinaCoal specimens from baijiao coal mine were impacted by a split Hopkinson pressure bar to study its dynamic mechanical behavior under different confining pressures (0-12 MPa) and different strain rates (20-250 s-1). The performances and the energy evolution characteristics of the coal specimens were analyzed. The results show that the strengthening effect and toughening effect of rock are gradually enhanced with the increase of confining pressure. At the same time, the coal failure gradually transitions and develops from tensile failure to compression-shear failure under the action of confining pressure. The peak strength and peak strain of coal rock show significant strain rate correlation and strong confining pressure effect with the change of confining pressures and strain rates. The dynamic strength growth factor of coal is approximately linear with the increasing of strain rates. The energy density and energy absorption density increase linearly with the increase of strain rates, and the energy consumption ratio has a logarithmic growth relationship with the strain rates.http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361900205L.pdfcoalsplit Hopkinson pressure barconfining pressurestrain rate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Lu Yi-Qiang Liu Xiao-Hui Xie Jing He Zhi-Qiang Li Cong |
spellingShingle |
Lu Yi-Qiang Liu Xiao-Hui Xie Jing He Zhi-Qiang Li Cong The energy evolution characteristics of coal under different dynamic strain rates and confining pressures Thermal Science coal split Hopkinson pressure bar confining pressure strain rate |
author_facet |
Lu Yi-Qiang Liu Xiao-Hui Xie Jing He Zhi-Qiang Li Cong |
author_sort |
Lu Yi-Qiang |
title |
The energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
title_short |
The energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
title_full |
The energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
title_fullStr |
The energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
title_full_unstemmed |
The energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
title_sort |
energy evolution characteristics of coal under different dynamic strain rates and confining pressures |
publisher |
VINCA Institute of Nuclear Sciences |
series |
Thermal Science |
issn |
0354-9836 |
publishDate |
2019-01-01 |
description |
Coal specimens from baijiao coal mine were impacted by a split Hopkinson pressure bar to study its dynamic mechanical behavior under different confining pressures (0-12 MPa) and different strain rates (20-250 s-1). The performances and the energy evolution characteristics of the coal specimens were analyzed. The results show that the strengthening effect and toughening effect of rock are gradually enhanced with the increase of confining pressure. At the same time, the coal failure gradually transitions and develops from tensile failure to compression-shear failure under the action of confining pressure. The peak strength and peak strain of coal rock show significant strain rate correlation and strong confining pressure effect with the change of confining pressures and strain rates. The dynamic strength growth factor of coal is approximately linear with the increasing of strain rates. The energy density and energy absorption density increase linearly with the increase of strain rates, and the energy consumption ratio has a logarithmic growth relationship with the strain rates. |
topic |
coal split Hopkinson pressure bar confining pressure strain rate |
url |
http://www.doiserbia.nb.rs/img/doi/0354-9836/2019/0354-98361900205L.pdf |
work_keys_str_mv |
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