Effect of pre-existing flaws on spalling fracture of granite

QIU Jiadong; LI Diyuan; LI Xibing; CHENG Tengjiao; LI Chongjin

doi:10.11883/bzycj-2016-0310

Volume 38 Issue 3

Feb. 2018

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Article Navigation > Explosion And Shock Waves > 2018 > 38(3): 665-670

QIU Jiadong, LI Diyuan, LI Xibing, CHENG Tengjiao, LI Chongjin. Effect of pre-existing flaws on spalling fracture of granite[J]. Explosion And Shock Waves, 2018, 38(3): 665-670. doi: 10.11883/bzycj-2016-0310

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QIU Jiadong, LI Diyuan, LI Xibing, CHENG Tengjiao, LI Chongjin. Effect of pre-existing flaws on spalling fracture of granite[J]. Explosion And Shock Waves, 2018, 38(3): 665-670. doi: 10.11883/bzycj-2016-0310

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Effect of pre-existing flaws on spalling fracture of granite

doi: 10.11883/bzycj-2016-0310

1.
School of Resources and Safety Engineering, Central South University, Changsha 410083, Hunan, China
2.
China Nerin Engineering Co., Ltd., Nanchang 330031, Jiangxi, China

Received Date: 2016-10-17
Rev Recd Date: 2017-01-17
Publish Date: 2018-05-25

Abstract

Abstract

The intact and pre-existing flaw granite specimens were tested by using the split Hopkinson pressure bar device with 50 mm rod diameter, and the whole process of spalling fracture was recorded by a high-speed video camera. Based on the theoretical analysis, the possible initial spalling positions of the granite specimens under half sine wave loading were calculated. The results of high-speed photography show that the pre-existing flaws have certain influence on the initial spalling positions, and spalling fractures generally occur at pre-existing flaws. According to the PFC2D (particle flow code in two dimensions) model, it is found that the initial spalling positions are influenced by the pre-existing flaws and the rising edge of the reflected tensile wave. The longer the rising edge of the reflection wave, the more likely the initial spalling occurs at the pre-existing flaw. The shorter the rising edge of the reflected tensile wave, the less likely the initial spalling occurs at the pre-existing flaw.
- spalling,
- pre-existing flaw,
- split Hopkinson pressure bar,
- granite

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References(16)

References

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