Effect of Heterogeneity in Micro-Structure and Micro-Strength on the Discrepancies Between Direct and Indirect Tensile Tests on Brittle Rock

Jiang, Rihua; Kang, Di; Zhang, Qiangyong

doi:10.1007/s00603-021-02700-y

Cited by 17 publications

(5 citation statements)

References 34 publications

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“…The use of a small initial value has no effect on the final damage profile, as discussed in [49]. Equation (1) shows that in the presence of open microcracks, frictional sliding is not expected, resulting in the exclusion of plastic strain from contributing to the strain energy density. Consequently, the model behaves in a brittle manner.…”

Section: Free Energymentioning

confidence: 99%

“…The tensile strength of brittle construction materials is a critical material parameter that plays a crucial role in the safe and durable design of structures. However, the tensile strength is typically lower than the compressive strength [1][2][3]. Direct or indirect methods can be used to measure the tensile strength of these materials [4].…”

mentioning

confidence: 99%

“…Numerical approaches in fracture mechanics can be broadly classified into two categories: discrete and continuum methods [25]. Discrete approaches, such as the Flat-Joint Method (FJM), Discrete Element Method (DEM), non-ordinary state-based peridynamics, and Discontinuous Deformation Analysis (DDA), have been used by researchers [1,4,[26][27][28][29][30][31] to model the fracture in a Brazilian splitting test. These methods provide an insight into the (quasi-)brittle fracture behavior of the material.…”

mentioning

confidence: 99%

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Micromechanics-based variational phase-field modeling of Brazilian splitting tests

Sarem

Deresse

Ulloa

et al. 2023

Engineering Fracture Mechanics

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Section: Free Energymentioning

confidence: 99%

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confidence: 99%

mentioning

confidence: 99%

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Micromechanics-based variational phase-field modeling of Brazilian splitting tests

Sarem

Deresse

Ulloa

et al. 2023

Engineering Fracture Mechanics

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“…Tensile strength in brittle materials such as rocks and concrete is typically determined using the direct tensile method or the indirect tensile method [1][2][3]. Shorter test cycles and more accurate results are achieved with the indirect tensile method compared to the direct tensile method [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Investigation on Indirect Tensile Strength of Concrete with Rectangular Cross-Section under Locally Distributed Load

Wang,

Xu,

Sun

et al. 2023

Materials

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The indirect tensile test plays a crucial role in experimental investigations of brittle material properties. In this study, a mechanical analysis model of the rectangular test block is established based on the theory of elastic mechanics for the characteristics of the indirect tensile test. The theoretical solution of the triangular series is derived for the rectangular test block under the locally distributed load. The finite element simulation results and splitting test results were compared with the theoretical results. The results of the study verify the accuracy of the theoretical solutions. Based on the proposed analytical solution, the effects of loading width and length-to-height ratio (h/l) of local loading on the measured tensile strength of test block are discussed. The results demonstrate that the tensile strength of the test block increases as the loading width expands, and the rate of growth in the recorded tensile strength gradually stabilizes. The variation in loading width affects the location of crack initiation points during the concrete test block splitting tests. When the loading width exceeds 6% of the side length of test block, the cracking point is positioned at the center of test block, ensuring the effectiveness of the splitting test. As the length-to-height ratio of the test block increases, there is a general upward trend in the measured tensile strength. When h/l < 0.6, the measured tensile strength initially increases before decreasing. However, when h/l > 0.6, the measured tensile strength consistently increases, with the rate of increase gradually diminishing until it stabilizes. The length-to-height ratio also significantly influences the location of the cracking point in the test block. As the length-to-height ratio increases, the cracking point initially shifts from around the center to the central point and then further from the center toward the edge. To ensure that the location of the crack initiation point is in the center of the specimen and that the tensile strength is close to the measured result, the length to height ratio can be chosen at around 0.85.

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“…FJ contacts enclose a spherical particle with planar "faces", and thus realizing a polyhedral-like geometry (Potyondy, 2012;Xu Xueliang and Wu, 2016). FJ contacts are widely applied in the simulation of rock matrix (Bahaaddini et al, 2021;Castro-Filgueira et al, 2020Jiang et al, 2022;Potyondy, 2018;Wu Shunchuan and Xu, 2016;Xu Xueliang and Wu, 2016;Zhang et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Application of a Novel Local Dynamic Weakening Model Coupled with Smooth-joint Contact in the Simulation of Fault Ruptures and Laboratory Earthquakes

Lui

Young

2022

Preprint

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Discrete-element-method (DEM) codes were developed in the field of rock mechanics. Compared to continuum codes, it has many advantages such as allowing larger grain displacements, detachment of grains, and simulation of discrete fractures. However, the disadvantage of DEM codes in the simulation of higher confining pressure triaxial tests were not previously discussed. In this study, we explored how the non-Dirac-delta distribution of contact forces controls the fault rupture initiation, and its impact on fault rupture propagation under high confining pressure. Based on the above study, a novel local dynamic weakening model was proposed and incorporated into the smooth-joint (SJ) contact model. The dynamic weakening model is tested with simulations of experiments conducted under high confining pressures. It is shown to be successful at reproducing realistic fault rupture behaviors, and the synthetic acoustic emission (AE) characteristics including magnitude-frequency relationships and fractal dimensions match those in the experiment.

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Effect of Heterogeneity in Micro-Structure and Micro-Strength on the Discrepancies Between Direct and Indirect Tensile Tests on Brittle Rock

Cited by 17 publications

References 34 publications

Micromechanics-based variational phase-field modeling of Brazilian splitting tests

Micromechanics-based variational phase-field modeling of Brazilian splitting tests

Theoretical Investigation on Indirect Tensile Strength of Concrete with Rectangular Cross-Section under Locally Distributed Load

Application of a Novel Local Dynamic Weakening Model Coupled with Smooth-joint Contact in the Simulation of Fault Ruptures and Laboratory Earthquakes

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