Energy consumption in rock fragmentation at intermediate strain rate

Liang, Hong; Zhou, Zilong; Yin, Tubing; Guoyan, Liao; Ye, Zhouyuan

doi:10.1007/s11771-009-0112-5

Cited by 70 publications

(17 citation statements)

References 14 publications

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“…During the process of dynamic loading, the stress wave duration has a certain effect on impact breaking and dissipation of the rock [26]. In order to analyze the evolution of energy with time during the dynamic loading process of the sample, Figure 5 shows the energy-time curves under different temperature conditions.…”

Section: Variation Of Energy During the Process Of Impact Failurementioning

confidence: 99%

Study on Impact Damage and Energy Dissipation of Coal Rock Exposed to High Temperatures

Yin

Peng

Wang

et al. 2016

Shock and Vibration

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The dynamic failure characteristics of coal rock exposed to high temperatures were studied by using a split Hopkinson pressure bar (SHPB) system. The relationship between energy and time history under different temperature conditions was obtained. The energy evolution and the failure modes of specimens were analyzed. Results are as follows: during the test, more than 60% of the incident energy was not involved in the breaking of the sample, while it was reflected back. With the increase of temperature, the reflected energy increased continuously; transmitted and absorbed energy showed an opposite variation. At the temperature of 25 to 100°C, the absorbed energy was less than that transmitted, while this phenomenon was opposite after 100°C. The values of specific energy absorption (SEA) were distributed at 0.04 to 0.1 J·cm−3, and its evolution with temperature could be divided into four different stages. Under different temperature conditions, the failure modes and the broken blocks of the samples were obviously different, combining with the variation of microstructure characteristics of coal at high temperatures; the physical mechanism of damage and failure patterns of coal rock are explained from the viewpoint of energy.

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Section: Variation Of Energy During the Process Of Impact Failurementioning

confidence: 99%

Study on Impact Damage and Energy Dissipation of Coal Rock Exposed to High Temperatures

Yin

Peng

Wang

et al. 2016

Shock and Vibration

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“…However, the pieces and debris increase significantly with a more serious failure degree under the impact velocity of 18.0 m/s compared to the impact velocity of 15.0 m/s. When the velocity continues to increase, the BED density increases, the damage degree of sample becomes severer, and the corresponding gradation of fragments is better [Hong, Zhou, Yin et al 2009]. Fig.…”

Section: Variation Of Peak Stress Peak Strain and Elastic Modulusmentioning

confidence: 95%

Mechanical Response and Energy Dissipation Analysis of Heat-Treated Granite Under Repeated Impact Loading

Wang¹,

Tian²,

Wang³

et al. 2019

Computers, Materials &Amp; Continua

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The mechanical behaviors and energy dissipation characteristics of heat-treated granite were investigated under repeated impact loading. The granite samples were firstly heat-treated at the temperature of 20°C, 200°C, 400°C, and 600°C, respectively. The thermal damage characteristics of these samples were then observed and measured before impact tests. Dynamic impact compression tests finally were carried out using a modified split-Hopkinson pressure bar under three impact velocities of 12 m/s, 15 m/s, and 18 m/s. These test results show that the mineral composition and the main oxides of the granite do not change with these treatment temperatures. The number of microcracks and microvoids decreases in the sample after 200°C treatment. The mechanical properties of a sample after 600°C treatment were rapidly deteriorated under the same impact velocity. The average of peak stress is much smaller than those after 20°C, 200°C and 400°C treatments. The heat-treated samples have an energy threshold each. When the dissipated energy of a sample under a single impact is less than this threshold, the repeated impacts hardly lead to further damage accumulation even if its total breakage energy dissipation (BED) density is large. Under the same number of repeated impacts, the cumulative BED density of a sample after 600°C treatment is the largest and its damage evolves most quickly. The total BED density of the sample after 200°C treatment is the highest, which implies that this sample has better resistance to repeated impact, thus having less crack initiation and growth.

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“…e size of involved sieves were 31.5 mm, 25 mm, 20 mm, 16 mm, 10 mm, 5 mm, 2.5 mm, 1.25 mm, and 0.63 mm. After sieving, average fragment size is used to describe the fracture degree and is calculated by using the following equation [51]:…”

Section: Variation Of Dynamic Fragmentsmentioning

confidence: 99%

Coupled Effect of Water Temperature and Cyclic Wetting and Drying on Dynamic Mechanical Characteristics of Sandstone

Yuan

Wei

et al. 2019

Advances in Civil Engineering

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Considering the periodical moisture variation in deep rock masses, cyclic wetting and drying under high geothermal condition is a vital issue for the safety and stability of deep rock engineering. To investigate the coupled effect of water temperature and cyclic wetting and drying on dynamic mechanical characteristics of sandstone, dynamic uniaxial compressive tests were carried out under the same loading condition for sandstone specimens subjected to cyclic wetting and drying treatment. When the temperature was 60°C in both wetting and drying processes, cyclic wetting and drying treatment presents a detrimental effect on the tested sandstone. Both physical and dynamic uniaxial compressive characteristics deteriorate in an exponential function with the increase of wetting and drying cycles. Based on SEM image analyses, the initiation and propagation of microcracks is mainly the result of cyclic loading and unloading of tensile stresses induced by water absorption and desorption of kaolinite within sandstone during cyclic wetting and drying treatment. After 15 cycles of wetting and drying, the deterioration of both physical and dynamic uniaxial compressive characteristics first increase then decrease with water temperature in wetting process elevating from 20°C to 98°C. SEM images indicate that more microcracks generate when water temperatures increase from 20°C to 60°C, while the micromorphology is changed and fewer microcracks display due to kaolinite mobilization when water temperature increases from 60°C to 98°C. The threshold value for the effect of water temperature on cyclic wetting and drying is found to be about 60°C for the tested sandstone.

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Energy consumption in rock fragmentation at intermediate strain rate

Cited by 70 publications

References 14 publications

Study on Impact Damage and Energy Dissipation of Coal Rock Exposed to High Temperatures

Study on Impact Damage and Energy Dissipation of Coal Rock Exposed to High Temperatures

Mechanical Response and Energy Dissipation Analysis of Heat-Treated Granite Under Repeated Impact Loading

Coupled Effect of Water Temperature and Cyclic Wetting and Drying on Dynamic Mechanical Characteristics of Sandstone

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