Split Hopkinson Pressure Bar Test and Its Numerical Analysis Based on Transparent Rock Samples

Chang-xing, Zhu; Li, Weidong; An, Yeming

doi:10.1007/s12205-022-1743-4

Cited by 4 publications

(3 citation statements)

References 34 publications

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“…Understanding the force chain distribution is crucial in comprehending the mechanism of crack generation and extension, as it is closely linked to the propagation of cracks [22][23][24][25][26][27]. To…”

Section: Force Chain Distributionmentioning

confidence: 99%

Mechanical characteristics and energy evolution of rock with circular hole defects

Xuan,

2023

PLoS ONE

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In this paper, the uniaxial compression damage characteristics of specimens are analyzed containing holes using PFC2D. In addition, the crack propagation, stress distribution and energy development characteristics of the specimens were systematically discussed. The findings indicate that the strength parameters of various specimens drop initially and then increase with increasing center point connecting angle, in comparison to intact rock. The most significant reduction in strength parameters is observed at a center point connecting angle of 45°. The stress concentration around the holes occurs prior to crack initiation and vanishes upon specimen failure. The number of cracks in the specimens is small and the propagation length is short before touching the peak value, while the cracks expand rapidly in a short period of time after the stress touches the peak value, and the crack development rules in the two stages are quite different. With increasing center point connecting angle, the pre-peak energy and total energy drop first and then increase. After touching the peak value, the specimen is dominated by energy release and the ability to absorb energy is weakened. In the case of center point connecting angle of 45°, the specimen has the largest energy difference coefficient and the worst ability to resist damage. The damage behavior can be composed of no damage, initial damage and accelerated damage take into account the damage change rules of the specimens.

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Section: Force Chain Distributionmentioning

confidence: 99%

Mechanical characteristics and energy evolution of rock with circular hole defects

Xuan,

2023

PLoS ONE

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“…The crack initiation, expansion, penetration, and fracture of the grouting specimens must be studied under radial impact load. The split Hopkinson pressure bar (SHPB) system has been commonly used in dynamic compression, splitting, and fracture testing of the materials in a dynamic load test (Dai et al, 2010;Chen et al, 2014;Liao et al, 2016;Zhu et al, 2022). Most previous experimental studies have focused on strain rate effects (Liu et al, 2019;Yu et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical research of crack propagation process and energy dissipation law of grouting specimens under radial impact load

Chang-xing

Sun²,

Gong³

et al. 2023

Front. Earth Sci.

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Different air pressures are used to conduct an impact test based on the split Hopkinson pressure bar (SHPB) test system to study the crack evolution process and energy dissipation law of the cemented rock under impact load. The failure mechanism of the specimens is analyzed from the perspective of dynamic failure process and energy dissipation. The spatial distribution of the specimen components visualized by the image reconstruction technology and the LS-DYNA mesoscopic model is established. Results show that the proportion of dissipated energy, the dynamic tensile strength and peak strain of the specimens increase with strain rate increase. The crack evolution process of the model is quantitatively described under an impact load, which is divided into four stages, namely, no crack stage, slow development stage, accelerated propagation stage and penetration stage. Compared with the indoor and simulation test result, the crack evolution process and failure modes are consistent under different strain rates. When the specimens are destroyed, the energy dissipation rate fluctuates from 10% to 13%. The dissipated energy of cement paste accounts for more than 90% of the total dissipated energy. The cement paste damages first and its strength has a great influence on the strength of the grouting specimens. This study provides a reference to evaluate the cemented rock under a dynamic load.

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“…Luo et al [ 22 ] developed a numerical model of an SHPB using PFC software to analyze the dynamic mechanical properties and damage modes of sandstone in terms of fine fractures and energy. Similarly, Zhu et al [ 23 , 24 , 25 ] used the PFC software to investigate the microscopic fracture evolution patterns of rocks under dynamic impact.…”

Section: Introductionmentioning

confidence: 99%

Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

Ren

Zhang

et al. 2023

Materials

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The objective of this work was to investigate the damage characteristics and failure modes of gypsum rock under dynamic impact loading. Split Hopkinson pressure bar (SHPB) tests were performed under different strain rates. The strain rate effects on the dynamic peak strength, dynamic elastic modulus, energy density, and crushing size of gypsum rock were analyzed. A numerical model of the SHPB was established using the finite element software, ANSYS 19.0, and its reliability was verified by comparing it to laboratory test results. The results showed that the dynamic peak strength and energy consumption density of gypsum rock increased exponentially with strain rate, and the crushing size decreased exponentially with the strain rate, both findings exhibited an obvious correlation. The dynamic elastic modulus was larger than the static elastic modulus, but did not show a significant correlation. Gypsum rock fracture can be divided into crack compaction, crack initiation, crack propagation, and breaking stages, and is dominated by splitting failure. With increasing strain rate, the interaction between cracks is noticeable, and the failure mode changes from splitting to crushing failure. These results provide theoretical support for improvements of the refinement process in gypsum mines.

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Split Hopkinson Pressure Bar Test and Its Numerical Analysis Based on Transparent Rock Samples

Cited by 4 publications

References 34 publications

Mechanical characteristics and energy evolution of rock with circular hole defects

Mechanical characteristics and energy evolution of rock with circular hole defects

Experimental and numerical research of crack propagation process and energy dissipation law of grouting specimens under radial impact load

Study on Damage Characteristics and Failure Modes of Gypsum Rock under Dynamic Impact Load

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