Coupled Static‐Dynamic Tensile Mechanical Properties and Energy Dissipation Characteristic of Limestone Specimen in SHPB Tests

Ping, Qi; Fang, Zhaohui; Ma, Dongdong; Zhang, Hao

doi:10.1155/2020/7172928

Cited by 9 publications

(7 citation statements)

References 31 publications

(33 reference statements)

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“…The failure modes of the granite under dynamic splitting can be roughly divided into two types (Figure 14): mode Ⅰ, tensile splitting failure, and mode II, tensile‐shear splitting failure (Mardoukhi et al, 2017; Ping, Fang, et al, 2020). Mode I failure of the BD samples is mainly characterized by a cut‐through main single tensile crack along the loading direction.…”

Section: Test Results and Analysismentioning

confidence: 99%

Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting

Qian,

Jia,

Mao

et al. 2023

Deep Underground Science and Engineering

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In order to understand the mechanical properties and the fracture surface roughness characteristics of thermally damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after thermal treatment at 25, 200, 400, and 600°C. Results show that the dynamic peak splitting strength of thermally damaged granite samples increases with increasing strain rate, showing obvious strain‐rate sensitivity. With increasing temperature, thermally induced cracks in granite transform from intergranular cracks to intragranular cracks, and to a transgranular crack network. Thermally induced damages reduce the dynamic peak splitting strength and the maximum absorbed energy while increasing the peak radial strain. The fracture mode of the thermally damaged granite under dynamic loads is mode II splitting failure. By using the axial roughness index , the distribution ranges of the wedge‐shaped failure zones and the tensile failure zones in the fracture surfaces under dynamic Brazilian splitting can be effectively identified. The radial roughness index is sensitive to the strain rate and temperature. It shows a linear correlation with the peak splitting strength and the maximum absorbed energy and a linear negative correlation with the peak radial strain. can be used to quantitatively estimate the dynamic parameters based on the models proposed.

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Section: Test Results and Analysismentioning

confidence: 99%

Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting

Qian,

Jia,

Mao

et al. 2023

Deep Underground Science and Engineering

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“…Previous studies have shown that static stress has an important effect on the mechanical properties of rock, such as compressive strength, tensile strength, Poisson's ratio, and Young's modulus [21][22][23]; the static stress controls the evolution of the strain field in rock mass during rock blasting. The strain fields under uniaxial and biaxial static stress are significantly different with those that are under no static stress [24,25].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

et al. 2021

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In situ stress is one of the most important factors affecting rock dynamic fractures during blasting excavation of deep rock mass that generally is hard rock. In this research, crater blasting experiments on hard rock under different uniaxial static stresses were conducted to investigate the initiation and propagation process of crack networks that were induced by coupled dynamic and static loads. Furthermore, the effects of anisotropic static stress fields on the initiation and propagation of crack networks during hard rock blasting, and the crack network morphological characteristics were analyzed and elucidated. The experimental results showed that the static stress field changed the process of crack network initiation and propagation during hard rock blasting, and then control the crack network morphology. Under uniaxial static stress, the crack network was elliptical with the long axis parallel to the static stress. In addition, the larger the anisotropic static stress is, the more obvious the elliptical morphology of the crack network. Moreover, the static stress lead to the delay of crack formation which indicates that the delay time during millisecond blasting excavation of deep rock mass should be adjusted appropriately according to the in situ stress. A stress-strength ratio (SSR) of 0.15 is the threshold value where static stress may have a significant effect on the initiation and propagation of a crack network. Meanwhile, the strain field prior to crack initiation during rock blasting controlled the morphological characteristics of the crack network. Finally, the mechanism of static stress affecting propagation and morphology of crack network was revealed theoretically.

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“…Cheng [6] conducted dynamic experiments on sandstones with different axial pressures to test the energy dissipation of the stress wave and believed that the attenuation of the stress wave energy had a quadratic function relationship with the axial static load. Ping [7] conducted a dynamic splitting test on limestone and believed that the dynamic tensile strength of limestone and the increase in absorbed energy increased as a power function. Ma [8] found through experiments that as the number of prefabricated cracks gradually increased, the energy consumed during the damage and destruction process of the specimen also gradually decreased.…”

Section: Introductionmentioning

confidence: 99%

Energy Dissipation and Electromagnetic Radiation Response of Sandstone Samples with a Pre-Existing Crack of Various Inclinations under an Impact Load

Zang

Niu

et al. 2021

Minerals

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Various primary fissures and defects are widely present in a rock mass and have a significant impact on the stability of the rock mass. We studied the influence of the crack inclination angle on the energy dissipation and electromagnetic radiation (EMR) response of sandstone under an impact load. Impact tests were conducted on red sandstone samples with different inclination angles, in addition to test energy dissipation and EMR signals. The results showed that as the energy of the stress wave increased, the energy consumption density and damage variables of the sample gradually increased, and the electromagnetic radiation energy also increased. As the crack inclination increased, the energy consumption density first decreased and then increased, while the damage variable and electromagnetic radiation energy first increased and then decreased. In the process of impact damage, the main frequency of EMR was 0~5 kHz. As the energy of the stress wave increased, the dominant frequency band of the main frequency expanded from low frequency to high frequency, and the amplitude signal gradually increased; the α = 45° specimen frequency domain was the widest, and the amplitude was the largest. The crack inclination significantly changed the failure state of the sample, resulting in changes in the energy dissipation and the electromagnetic radiation response of the sample.

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Coupled Static‐Dynamic Tensile Mechanical Properties and Energy Dissipation Characteristic of Limestone Specimen in SHPB Tests

Cited by 9 publications

References 31 publications

Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting

Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting

Experimental Study on the Effects of In Situ Stress on the Initiation and Propagation of Cracks during Hard Rock Blasting

Energy Dissipation and Electromagnetic Radiation Response of Sandstone Samples with a Pre-Existing Crack of Various Inclinations under an Impact Load

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