LAPSE

LAPSE:2019.0964
Published Article
LAPSE:2019.0964
Determination of Holmquist−Johnson−Cook Constitutive Parameters of Coal: Laboratory Study and Numerical Simulation
Beijing Xie, Zheng Yan, Yujing Du, Zeming Zhao, Xiaoqian Zhang
August 15, 2019
The main sensitivity parameters of the Holmquist−Johnson−Cook constitutive model for coal were obtained from a variety of tests such as uniaxial compression, uniaxial cyclic loading, splitting and triaxial compression tests, as well as the indirect derivation equation of a briquette. The mechanical properties of briquettes under dynamic impact were investigated using a split Hopkinson pressure bar experiment. Based on the experimental measurement of the Holmquist−Johnson−Cook constitutive model, the numerical simulation of briquette was performed using ANSYS/LS-DYNA software. A comparison between experimental and simulation results verified the correctness of simulation parameters. This research concluded that the failure of briquette at different impact velocities started from an axial crack in the middle of the coal body, and the sample was swollen to some extent. By the increase of impact velocity, the severity of damage in the coal body was increased, while the size of the coal block was decreased. Moreover, there was good compliance between experimental and simulated stress wave curves in terms of coal sample failure and fracture morphology at different speeds. Finally, the parameters of the validated Holmquist−Johnson−Cook constitutive model were applied to the numerical simulation model of the impact damage of heading face and the process of coal seam damage in the roadway was visually displayed. The obtained results showed that the Holmquist−Johnson−Cook constitutive model parameters suitable for the prominent coal body were of great significance for the improvement and exploration of the occurrence mechanism of coal and rock dynamic disasters.
Keywords
Holmquist–Johnson–Cook constitutive model of briquette, numerical simulation, parameter acquisition, split Hopkinson pressure bar experiment
Suggested Citation
Xie B, Yan Z, Du Y, Zhao Z, Zhang X. Determination of Holmquist−Johnson−Cook Constitutive Parameters of Coal: Laboratory Study and Numerical Simulation. (2019). LAPSE:2019.0964
Author Affiliations
Xie B: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Yan Z: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Du Y: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Zhao Z: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
Zhang X: School of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
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Journal Name
Processes
Volume
7
Issue
6
Article Number
E386
Year
2019
Publication Date
2019-06-21
Published Version
ISSN
2227-9717
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Original Submission
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PII: pr7060386, Publication Type: Journal Article
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LAPSE:2019.0964
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doi:10.3390/pr7060386
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Aug 15, 2019
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Aug 15, 2019
 
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Original Submitter
Calvin Tsay
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