Strain rate effect on crack propagation and fragmentation characteristics of red sandstone containing pre-cracks

WEN Lei; FENG Wenjie; LI Mingye; KOU Zilong; WANG Liang; YU Junhong

doi:10.11883/bzycj-2023-0061

Volume 43 Issue 11

Nov. 2023

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WEN Lei, FENG Wenjie, LI Mingye, KOU Zilong, WANG Liang, YU Junhong. Strain rate effect on crack propagation and fragmentation characteristics of red sandstone containing pre-cracks[J]. Explosion And Shock Waves, 2023, 43(11): 113103. doi: 10.11883/bzycj-2023-0061

Citation:

WEN Lei, FENG Wenjie, LI Mingye, KOU Zilong, WANG Liang, YU Junhong. Strain rate effect on crack propagation and fragmentation characteristics of red sandstone containing pre-cracks[J]. Explosion And Shock Waves, 2023, 43(11): 113103. doi: 10.11883/bzycj-2023-0061

Citation:

WEN Lei, FENG Wenjie, LI Mingye, KOU Zilong, WANG Liang, YU Junhong. Strain rate effect on crack propagation and fragmentation characteristics of red sandstone containing pre-cracks[J]. Explosion And Shock Waves, 2023, 43(11): 113103. doi: 10.11883/bzycj-2023-0061

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Strain rate effect on crack propagation and fragmentation characteristics of red sandstone containing pre-cracks

doi: 10.11883/bzycj-2023-0061

1.
Department of Engineering Mechanics, Shijiazhuang Tiedao University, Shijiazhuang 050043, Hebei, China
2.
Hebei Polytechnic Institute, Shijiazhuang 050091, Hebei, China
3.
China Railway Bridge Science Research Institute Co. Ltd., Wuhan 430034, Hubei, China

Received Date: 2023-02-27
Rev Recd Date: 2023-08-25

Available Online: 2023-08-25

Publish Date: 2023-11-17

Abstract

Abstract

In this experiment, finite size red sandstone containing pre-existing single crack was taken as the research object. The ratio of length to width of the samples was set about 0.65. The inclination angle of the pre-crack includes 0°, 30°, 45°, 60° and 90°. A split Hopkinson pressure bar was used for impact test, and a high-speed camera was used to record the crack propagation. The dynamic loads were applied along the width of the samples. Velocities of striker in impact tests were set as 6, 8 and 10 m/s by adjusting the pressure of the air gun. Acquisition frequency of the high-speed camera was set as 75000 s⁻¹. The characteristics of crack propagation, dynamic compressive strength and dynamic elastic modulus of the samples were obtained. The fractal theory was used to describe the fragmentation characteristics of the samples. The relationship between dynamic mechanical properties, fragmentation characteristics and crack propagation under medium strain rate was discussed. The findings show that when the strain rate is high, more far-field cracks and separation cracks appear in the sample. In the range of medium strain rate, the failure mode and the number of cracks change differently with strain rate compared with the experimental results of low strain rate. The strain rate and the angle of pre-existing crack have a great influence on the crack propagation and failure mode of the samples. The crack propagation of the samples with different pre-existing crack is different. With the increase of strain rate, the failure mode of the sample becomes more complex, gradually evolving from critical failure with a tensile crack to complex failure mainly with X-shaped shear crack. When the angle of the pre-existing crack is fixed, the dynamic compressive strength and dynamic elastic modulus of the samples show obvious strain rate effect, and the pre-existing crack with different angles have significant influence on the strain rate sensitivity of the samples. With the increase of pre-existing crack angle, the variation of dynamic compressive strength, dynamic elastic modulus and fractal dimension of the samples show a certain similarity. In all types of samples, the dynamic compressive strength, dynamic elastic modulus and fractal dimension of the sample containing cracks with the inclination angle at 45° are the smallest. With the increase of strain rate, distribution of fragments becomes more dispersed. The higher the strain rate, the more significant the effect of the pre-existing crack on the fracture degree and fractal dimension of the samples.
- strain rate,
- crack propagation,
- red sandstone,
- split Hopkinson pressure bar,
- crack inclination angle,
- fracture

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References(37)

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