Dynamic crack propagation and arrest investigated with a cracked eccentrically-holed flattened disc of rock

LI Lian; LUO Lin; WU Lizhou; WANG Qizhi

doi:10.11883/bzycj-2017-0122

Volume 38 Issue 6

Sep. 2018

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LI Lian, LUO Lin, WU Lizhou, WANG Qizhi. Dynamic crack propagation and arrest investigated with a cracked eccentrically-holed flattened disc of rock[J]. Explosion And Shock Waves, 2018, 38(6): 1218-1230. doi: 10.11883/bzycj-2017-0122

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LI Lian, LUO Lin, WU Lizhou, WANG Qizhi. Dynamic crack propagation and arrest investigated with a cracked eccentrically-holed flattened disc of rock[J]. Explosion And Shock Waves, 2018, 38(6): 1218-1230. doi: 10.11883/bzycj-2017-0122

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Dynamic crack propagation and arrest investigated with a cracked eccentrically-holed flattened disc of rock

doi: 10.11883/bzycj-2017-0122

LI Lian^{1, 4},
LUO Lin²,
WU Lizhou³,
WANG Qizhi^{1, 2, 3
,}

1.
Department of Civil Engineering and Applied Mechanics, Sichuan University, Chengdu 610065, Sichuan, China
2.
State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing 400074, China
3.
State Key Laboratory of Geohazard Prevention and Geoenvironmental Protection, Chengdu University of Technology, Chengdu 610059, Sichuan, China
4.
China Railway Eryuan Engineering Group Co.Ltd., Chengdu 610031, Sichuan, China

Received Date: 2017-04-14
Rev Recd Date: 2017-09-16
Publish Date: 2018-11-25

Abstract

Abstract

Expanding the advantages of flattened ring geometry, a new test specimen geometry with a longer fracture path was advised to investigate the complete dynamic fracture process.This geometry was cracked eccentrically holed flattened disc (CEHFD) which was more conducive to study the unstable dynamic crack propagation and dynamic crack arrest.In order to study the mode Ⅰ (opening mode) dynamic fracture process of a rock, CEHFD specimens with strain gauges and crack propagation gauge glued on the specimen's surface were diametrically impacted by a split Hopkinson pressure bar.The experiment investigated crack initiation, rapid crack propagation, and crack arrest, all in one specimen.In a single complete fracture event, the crack accelerated after initiating and decelerated before arresting.The process monitored by the laboratory is completely consistent with the whole process of the dynamic rupture of faults in earthquake.A hybrid experimental-numerical-analytical method was used to determine the dynamic stress intensity factor that increased with increasing time.The dynamic fracture toughness was obtained with the fracture time information.Crack propagation velocity was first increased and then decreased with the time, and the dynamic propagation toughness had the same variation tendency with time as it was the function of velocity.The dynamic arrest toughness was smaller than the dynamic initiation toughness, and decreased when the maximum crack propagation speed increased.

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References(33)

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