Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading

XIAO Dingjun; ZHU Zheming; PU Chuanjin; LU Lu; HU Rong

doi:10.11883/bzycj-2018-0516

Volume 40 Issue 2

Jan. 2020

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XIAO Dingjun, ZHU Zheming, PU Chuanjin, LU Lu, HU Rong. Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading[J]. Explosion And Shock Waves, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516

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XIAO Dingjun, ZHU Zheming, PU Chuanjin, LU Lu, HU Rong. Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading[J]. Explosion And Shock Waves, 2020, 40(2): 024101. doi: 10.11883/bzycj-2018-0516

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Study of testing method for dynamic initiation toughness of blue sandstone under blasting loading

doi: 10.11883/bzycj-2018-0516

XIAO Dingjun^{1, 2
,},
ZHU Zheming³,
PU Chuanjin^{1, 2
,
,},
LU Lu¹,
HU Rong¹

1.
College of Environment and Resources, Southwest University Science and Technology, Mianyang 621010, Sichuan, China
2.
Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Mianyang 621010, Sichuan, China
3.
College of Architecture and Environment, Sichuan University, Chengdu 610065, Sichuan, China

Received Date: 2018-12-26
Rev Recd Date: 2019-05-10

Available Online: 2019-11-25

Publish Date: 2020-02-01

Abstract

Abstract

In this paper, an internal central single-cracked disk (ICSCD) specimen was proposed for the study of dynamic fracture initiation toughness of sandstone under blasting loading. We conducted blasting tests on an ICSCD specimen fabricated from a blue sandstone disc (400 mm in diameter) with a crack (60 mm in length), obtained a blasting strain-time curve from the radial strain gauges fixed around the blast hole, determined the fracture initiation time with the circumferential strain gauges placed around the crack tip, and then derived the stress history on the blast hole of the sandstone specimen from the measured strain curve through the Laplace transform. Furthermore, we obtained the numerical solutions using numerical inversion, establishing a numerical model using the finite element software ANSYS, and derived Type I dynamic stress intensity factor curves of the sandstone under blasting loading by the mutual interaction, with the results achieved: (1) the ICSCD specimen can be used to measure the dynamic initiation fracture toughness of rocks; (2) the stress on the blast hole wall can be obtained by the Laplace numerical inversion method; (3) the dynamic initiation fracture toughness of the ICSCD sandstone specimen can be calculated by the experimental-numerical method with an error below 7%.
- blasting loading,
- strain test,
- dynamic initiation fracture toughness,
- numerical inversion method

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References

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