Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.

Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.

To investigate the influence of bedding structure and different loading rates on the dynamic fracture characteristics and energy dissipation of Datong coal, a split Hopkinson bar was used to obtain the fracture characteristics of coal samples with different bedding angles. The process of crack initi...

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Autores principales: Shuang Gong, Zhen Wang, Lei Zhou
Formato: article
Lenguaje:EN
Publicado: Public Library of Science (PLoS) 2021
Materias:
Medicine
R
Science
Q
Acceso en línea:https://doaj.org/article/5878c2befdb64c08a0d94c8e1aad9eaf
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spelling oai:doaj.org-article:5878c2befdb64c08a0d94c8e1aad9eaf2021-12-02T20:05:18ZDynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.1932-620310.1371/journal.pone.0247908https://doaj.org/article/5878c2befdb64c08a0d94c8e1aad9eaf2021-01-01T00:00:00Zhttps://doi.org/10.1371/journal.pone.0247908https://doaj.org/toc/1932-6203To investigate the influence of bedding structure and different loading rates on the dynamic fracture characteristics and energy dissipation of Datong coal, a split Hopkinson bar was used to obtain the fracture characteristics of coal samples with different bedding angles. The process of crack initiation and propagation in Datong coal was recorded by the high-speed camera. The formula for the model I fracture toughness of the transversely isotropic material is obtained on the basis of the finite element method (FEM) together with the J-integral. By comparing the incident energy, absorbed energy, fracture energy and residual kinetic energy of Datong coal samples under various impact speeds, the energy dissipation characteristics during the dynamic fracture process of coal considering the bedding structure is acquired. The experimental results indicate that the fracture pattern of notched semi-circular bending (NSCB) Datong coal is tensile failure. After splitting into two parts, the coal sample rotates approximately uniformly around the contact point between the sample and the incident rod. The dynamic fracture toughness is 3.52~8.64 times of the quasi-static fracture toughness for Datong coal. Dynamic fracture toughness increases with increasing impact velocity, and the effect of bedding angle on fracture toughness then decreases. In addition, the residual kinetic energy of coal samples with the same bedding angle increases with the increase of impact speed. The energy utilization rate decreases continuously, and the overall dispersion of statistical data decreases gradually. In rock fragmentation engineering, the optimum loading condition is low-speed loading regardless of energy utilization efficiency or fracture toughness. These conclusions may have significant implications for the optimization of hydraulic fracturing process in coal mass and the further understanding of crack propagation mechanisms in coalbed methane extraction (CME). The anisotropic effect of coal should be fully considered in both these cases.Shuang GongZhen WangLei ZhouPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 16, Iss 6, p e0247908 (2021)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Shuang Gong
Zhen Wang
Lei Zhou
Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
description To investigate the influence of bedding structure and different loading rates on the dynamic fracture characteristics and energy dissipation of Datong coal, a split Hopkinson bar was used to obtain the fracture characteristics of coal samples with different bedding angles. The process of crack initiation and propagation in Datong coal was recorded by the high-speed camera. The formula for the model I fracture toughness of the transversely isotropic material is obtained on the basis of the finite element method (FEM) together with the J-integral. By comparing the incident energy, absorbed energy, fracture energy and residual kinetic energy of Datong coal samples under various impact speeds, the energy dissipation characteristics during the dynamic fracture process of coal considering the bedding structure is acquired. The experimental results indicate that the fracture pattern of notched semi-circular bending (NSCB) Datong coal is tensile failure. After splitting into two parts, the coal sample rotates approximately uniformly around the contact point between the sample and the incident rod. The dynamic fracture toughness is 3.52~8.64 times of the quasi-static fracture toughness for Datong coal. Dynamic fracture toughness increases with increasing impact velocity, and the effect of bedding angle on fracture toughness then decreases. In addition, the residual kinetic energy of coal samples with the same bedding angle increases with the increase of impact speed. The energy utilization rate decreases continuously, and the overall dispersion of statistical data decreases gradually. In rock fragmentation engineering, the optimum loading condition is low-speed loading regardless of energy utilization efficiency or fracture toughness. These conclusions may have significant implications for the optimization of hydraulic fracturing process in coal mass and the further understanding of crack propagation mechanisms in coalbed methane extraction (CME). The anisotropic effect of coal should be fully considered in both these cases.
format article
author Shuang Gong
Zhen Wang
Lei Zhou
author_facet Shuang Gong
Zhen Wang
Lei Zhou
author_sort Shuang Gong
title Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
title_short Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
title_full Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
title_fullStr Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
title_full_unstemmed Dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
title_sort dynamic fracture mechanics and energy distribution rate response characteristics of coal containing bedding structure.
publisher Public Library of Science (PLoS)
publishDate 2021
url https://doaj.org/article/5878c2befdb64c08a0d94c8e1aad9eaf
work_keys_str_mv AT shuanggong dynamicfracturemechanicsandenergydistributionrateresponsecharacteristicsofcoalcontainingbeddingstructure
AT zhenwang dynamicfracturemechanicsandenergydistributionrateresponsecharacteristicsofcoalcontainingbeddingstructure
AT leizhou dynamicfracturemechanicsandenergydistributionrateresponsecharacteristicsofcoalcontainingbeddingstructure
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