The cratering performance of concrete target under true triaxial confinements

Zhang, Lei; Shan, Junfang; Miao, Chunhe; Fan, Chengnian; Wang, Pengfei; Shuanhai, Xu

doi:10.1016/j.ijmecsci.2021.106714

Cited by 9 publications

(1 citation statement)

References 33 publications

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“…The true triaxial Hopkinson compression bar test has been widely used as a rock dynamic mechanical property testing technology that can provide confining pressure under control (Xu et al, 2017(Xu et al, , 2020Zhang et al, 2021). The experimental equipment can control the confining pressure in three directions to provide different compression-shear coupling loading modes and invert the stres-strain relationship of the rock through the waveform signal on the bar.…”

Section: Discussionmentioning

confidence: 99%

The theory of compression–shear coupled composite wave propagation in rock

Miao

et al. 2022

Deep Underground Science and Engineering

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The wave velocity analysis of rock medium is the main method used to explore the internal compositions in the crust and research seismic. In this paper, a compression-shear coupled nonlinear elastic constitutive relation is established, which is consistent with the mechanical properties of rock and mineral medium under high pressure. On this basis, numerical solutions of the wave equation and plane wave analytical solutions for the primary and secondary wave velocities are obtained. As is indicated by the comparison with the linear elastic constitutive theory, the results reflect the compression-shear coupling characteristics of the rock, including the stress path effect and the compression-shear coupling wave effect. With different parameter values, the velocity of the secondary wave changes from lower than that of the elastic shear wave, to higher than that of the elastic shear wave. The research results are expected to provide meaningful explanations for the physical mechanisms of the supershear wave and sub-Rayleigh wave, and guidance for the detection of rock and soil composition and the observation of seismic waves.

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Section: Discussionmentioning

confidence: 99%

The theory of compression–shear coupled composite wave propagation in rock

Miao

et al. 2022

Deep Underground Science and Engineering

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Stress‐Confinement Effect on the Dynamic Mechanical Properties of Heterogeneous Granite Under Impact Loading: Experimental and Numerical Simulation

Gong,

Wang,

Luo

et al. 2024

Num Anal Meth Geomechanics

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To investigate the stress‐confinement effect on the dynamic crack propagation and energy evolution characteristics of heterogeneous granite under impact loading, a three‐dimensional equivalent grain‐based model (3D‐GBM) and FLAC3D‐PFC3D coupled modeling technique was used to establish a numerical model of a full‐scale true triaxial Hopkinson test system. The results indicate that: (1) A rate‐effect model of the dynamic strength enhancement factor for heterogeneous rocks under multiaxial static and dynamic combined loading was constructed, with lateral stress confinement enhancing the sensitivity of dynamic strength to the strain rate. (2) Axial stress reduces the crack initiation stress ratio (σci/σd) and damage stress threshold ratio (σcd/σd), reducing the time to their onset, while lateral stress has the opposite effect. (3) Lateral stress confinement helps dynamically adjust the types of microcracks within the rock, restricts the relative slip friction between particles, and decreases the kinetic energy of failure. (4) At approximately the same strain rate, the strain energy and slip friction energy sequentially increase under uniaxial, biaxial, and triaxial stress confinement. The mutual slip friction and movement between rock particles are more intense under biaxial stress confinement compared to uniaxial conditions.

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