Research of an SHPB Device in Two-by-Two Form for Impact Experiments of Concrete-Like Heterogeneous Materials

In the actual mining process of shale gas, the loads and disturbances imposed on shale by man-made activities are a dynamic process. Therefore, the study of the dynamic constitutive theory of bedding shale under impact load has important theoretical value for the study of fracturing reformation of shale reservoirs and shale gas production. The objective is to explore the dynamic mechanical properties and fracture characteristics of shale with different bedding dip angles under medium and high strain rate loading. The split Hopkinson bar (SHPB) is used to conduct rock dynamic tests on shales with bedding dip angle of 0°, 30°, 60°, 90°. Based on fractal theory, we calculate the relationship between fractal dimension and broken fragments. The results show that the compressive strength and elastic modulus of shale change slowly when loaded at low strain rate, but when loaded at high strain rate, its compressive strength and elastic modulus increase significantly. The failure mode of shale is also transitioned from splitting failure at low strain rate to shear failure at high strain rate. Under high strain rate loading, the impact of loading rate on the dynamic mechanical properties of shale is greater than that of bedding dip. The mechanical behavior of shale under dynamic load is of great significance to the safe exploitation of shale gas and other resources.

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“…2) Assumption of stress equilibrium [14]. The condition to satisfy the assumption of stress equilibrium on the two end faces of the specimen.…”

Section: Split Hopkinson Bar Test Device and Principlementioning

confidence: 99%

Study on Dynamic Mechanical Properties of Bedding Shale Under Impact Load

Cheng

Feng

Xiao

et al. 2022

Preprint

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“…Kong et al used SHPB to conduct dynamic impact tests on gas-bearing coal [15]. In addition, many scholars have used the SHPB test to study materials such as coal, granite, limestone, marble, and concrete [16][17][18][19][20][21]. Qiu et al used SHPB to carry out impact compression tests on laminated sandstone with different bedding inclination angles and used a high-speed camera to capture the fracture process of samples [22].…”

Section: Introductionmentioning

confidence: 99%

Calibration Method of PFC3D Micro-Parameters under Impact Load

Zhang,

Gao,

Kou

2024

Applied Sciences

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Micro-parameter calibration is essential in constructing an accurate and reliable numerical model of particle discrete element PFC3D 6.0 software. Micro-parameter calibration is mainly accomplished according to the macro-parameters obtained from static or quasi-static laboratory tests such as UCS. However, there is little current research concerning the calibration method under impact load. An SJM micro-parameter calibration method, based on the SHPB rock test and the FLAC3D/PFC3D coupling method, is proposed to solve this problem. Firstly, UCS, SHPB, and other laboratory rock tests were carried out to determine the rock sample’s macroscopic physical and mechanical parameters. Secondly, the FLAC3D/PFC3D numerical coupling model of the SHPB test was established, and the single-factor and double-factor orthogonal numerical simulation was carried out. Then, the main micro-parameters that affect the macroscopic physical and mechanical parameters of the SJM particle discrete element model were proposed. Finally, the quantitative relationship between the model’s macro-parameters and micro-parameters was established through multiple linear regression. A set of PFC3D micro-parameter calibration processes under impact load was established. The relative errors of the macro-parameters obtained from laboratory and numerical tests totaled less than 5%, which further verifies the rationality of the calibration method. This method provides some reference values for PFC3D micro-parameter calibration under impact load.

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Three-dimensional mesoscopic investigation on the dynamic compressive behavior of coral sand concrete with reinforced granite coarse aggregate (GCA)

Guo,

Dong,

et al. 2025

Composite Structures

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Research of an SHPB Device in Two-by-Two Form for Impact Experiments of Concrete-Like Heterogeneous Materials

Cited by 8 publications

References 24 publications

Study on Dynamic Mechanical Properties of Bedding Shale Under Impact Load

Study on Dynamic Mechanical Properties of Bedding Shale Under Impact Load

Calibration Method of PFC3D Micro-Parameters under Impact Load

Three-dimensional mesoscopic investigation on the dynamic compressive behavior of coral sand concrete with reinforced granite coarse aggregate (GCA)

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