Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Gong, Fengqiang; Jia, Hangyu; Zhang, Zongxian; Hu, Jian; Luo, Song

doi:https://doi.org/10.1155/2020/8899355

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Volume 2020 | Article ID 8899355 | https://doi.org/10.1155/2020/8899355

Energy Dissipation and Particle Size Distribution of Granite under Different Incident Energies in SHPB Compression Tests

Fengqiang Gong,^1,2Hangyu Jia,¹Zongxian Zhang,³Jian Hu,¹and Song Luo¹

Academic Editor: Xuesheng Liu

Received24 Aug 2020

Revised07 Oct 2020

Accepted01 Nov 2020

Published18 Nov 2020

Abstract

To investigate energy dissipation and particle size distribution of rock under dynamic loads, a series of dynamic compression tests of granite specimens were conducted using a conventional split-Hopkinson pressure bar (SHPB) device with a high-speed camera. The experimental results show that the dissipated energy increases linearly with an increasing incident energy, following two different inclined paths connected by a critical incident energy, and the linear energy dissipation law in the dynamic compression test has been confirmed. This critical incident energy was found to be 0.29–0.33 MJ/m³. As the incident energy was smaller than the critical incident energy, the rock specimens remained unruptured after the impact. When the incident energy was greater than the critical incident energy, the rock specimens were ruptured or fragmented after the impact. In addition, the experimental results indicate that the dissipated energy and energy consumption ratio of a rock specimen, either unruptured or fragmented, increase with an increasing strain rate. Furthermore, it was found that fragment sizes at each mesh decrease with an increasing incident energy; that is, fragmentation becomes finer as incident energy increases.

1. Introduction

Rock structures are frequently subjected to dynamic loads from rock drilling, rock blasting, rock bursts, and seismic events or earthquakes [1–4]. Under dynamic loads, rock damage or fracture may occur and energy consumption happens [5–7]. Accordingly, it is of importance to investigate energy dissipation in the process of rock fracture [8–15]. Under static loads, experimental studies have confirmed that the deformation and failure of rock is a process of energy input, dissipation, and release. Gao et al. [16] investigated the characteristics of energy storage and dissipation of coal under one-time cyclic compression load. Gong et al. [17–19] found the linear energy storage and dissipation laws of rock materials in uniaxial compression tests or tension-type failure tests. Under dynamic loads, energy consumption has been experimentally studied for many decades using the split-Hopkinson pressure bar (SHPB) or tensile bar (SHTB). Among the previous investigators, Lundberg [20] and Li [21] through dynamic compression strength tests discovered that the energy absorbed by rock samples is usually less than 50% of the total input energy. Zhang et al. [22–24] by means of dynamic fracture tests found that the totally absorbed energy by rock increases with an increasing loading rate, but the energy efficiency decreases with an increasing loading rate. Li et al. [25] carried out dynamic compression tests on Bukit Timah granite and concluded that fractured specimens absorb more energy than unbroken ones and energy absorption per unit volume of rock increases linearly with increasing strain rates. Hong et al. [26] also conducted dynamic compression tests on granite, sandstone, and limestone and found that the average size of rock specimens decreases with the increase of the energy consumption per unit volume. Deng et al. [27] conducted dynamic uniaxial compressive tests on granite and sandstone and obtained a similar result as Hong et al. [26] did. Gong and Hu [28] found the dynamic linear energy dissipation law in the dynamic Brazilian disc tests on red sandstone.

The above description indicates that the previous studies have achieved important results of energy dissipation during rock fracture under dynamic loads. However, some gaps still exist. For example, (1) energy dissipation of unruptured specimens after impact compression testing has been seldom investigated and (2) the impact of incident energy on particle size distribution lacks a series of experimental studies. Based on the above background, this study investigated the energy dissipation of granite under dynamic compression by using the SHPB system with a high-speed camera filming the rock failure process. After the SHPB tests, all particles/fragments from granite specimens were collected, sieved, and analyzed, and the relation between incident energy and particle size was established.

2. Experimental Methods

2.1. SHPB Test System

This study employed the SHPB system which has been widely used in dynamic rock strength tests, dynamic rock fracture tests, and stress wave propagation tests [29–36]. As the SHPB system is used in measuring rock strengths and fracture toughness, two conditions should be satisfied: one-dimensional loading condition and stress equilibrium condition at the two ends of the rock specimen. The first condition means that a stress wave on each cross section of elastic bars always is kept as a planar wave. The second condition states that the stresses on both ends of the specimen are approximately equal before or when the specimen is failed.

As shown in Figure 1 (Gong et al. [35, 37]), the air gun can apply different impact loads to the testing system by adjusting the air pressure and the air pressure of the test is 0.35∼0.85 MPa. The incident bar and transmitted bar were made of 40Cr alloy steel with a diameter of 50 mm, a density of 7.81 g/cm³, and a longitudinal wave velocity of 5410 m/s. The lengths of the incident bar and transmitted bar were 2.0 m and 1.5 m, respectively. A spindle-shaped bullet was used to produce a half-sine wave.

To clearly observe the deformation and fracture characteristics of a rock specimen, a high-speed camera was used to record the whole loading and fracturing process. The camera took 72,000 frames per second (fps); that is, one photo took 13.89 μs. During a test, a glass box was placed surrounding the rock specimen. After the test, fragments of the fragmented granite specimen were collected. Then, the collected fragments were sieved in an order from large to small mesh sizes. After then, the fragments at each mesh size were weighed by using a high-sensitivity electronic scale with an accuracy of 0.01 g.

2.2. Testing Principle

In the SHPB system in Figure 1, the stress , strain , and strain rate at time t of the rock specimen can be obtained by the following formulas:where and are the cross-sectional area and Young’s modulus of the bars, respectively; is the one-dimensional longitudinal stress wave velocity of the bars; and are the cross-sectional area and length of rock specimen, respectively; , , and are the incident strain, reflected strain, and transmitted strain at the , respectively.

The incident energy , reflected energy , and transmitted energy can be obtained by the following formulas (e.g., Lundberg [20]):

In the SHPB test, the absorbed energy is often used to represent the energy dissipated during the impact of the rock specimen. In fact, the calculated energy absorbed by the rock specimen is equal to the energy dissipated in the impact process of the rock specimen [28]. The meaning of the dissipation energy in the dynamic compression specimen is the same as in the static test; that is, it is used for the failure and plastic deformation of the rock specimen during the compression process [38].

Thus, the dissipated energy by the rock specimen can be calculated by

The energy is dissipated in different components such as (1) fracture and damage energy E_FD used in crack extension and crack branching, (2) kinetic energy E_K used in translation and rotation of fragments, and (3) other energies E_O consumed in friction, heating, and other forms of energy (Zhang [24]); that is,

2.3. Specimen Preparation

The Changsha granite was selected to conduct dynamic compression tests due to its better integrity and homogeneity than many other rocks. All specimens were cored from one big (1 m × 1 m × 1 m) granite block with invisible geological structures. The specimens used in the test are 18. The specimen ID was organized in the form of “G-a,” wherein “G” represents the granite and “a” represents the specimen number. The specimens were manufactured into cylinders with a diameter and a height of 50 mm, as shown in Figure 2. The tolerance of evenness and nonparallelism of the specimen ends were less than 0.02 mm. The two-end surfaces of each specimen were coated with lubricant before the testing. The mechanical parameters of the granite are listed in Table 1.

2.4. Preparation of SHPB System before Formal Tests

Prior to formal tests, a trial experiment without rock specimen was performed to check the stability of the testing system. Figure 3(a) shows two stable and almost identical incident and transmitted waves, indicating that the wave measurement of the SHPB system is reliable for the formal tests. To ensure a dynamic stress equilibrium mentioned above, a trial test with one specimen was carried. Figure 3(b) shows the measured waves in the incident bar and the transmitted bar. Figure 3(c) indicates that the sum of the incident and reflected stress waves agrees well with the transmitted, meaning that the stresses on both ends of the specimen are approximately equal during dynamic loading.

(a)

(b)

(c)

3. Test Results

3.1. Stress-Strain Curves and Characteristics of Deformation and Failure

The stress-strain curves of 6 representative granite specimens under different incident energies are shown in Figure 4. These curves can be divided into three different types, as follows: Type I: the strain decreases immediately after the peak stress. As indicated by the curves of specimens G-1 and G-3, an elastic rebound immediately occurs in the stress-strain curves after the peak stress is reached. This elastic rebound is similar to the unloading process of a rock specimen in static rock compression tests. Type II: the peak stress strain first increases for a while and then decreases, as shown in the stress-strain curves of specimens G-8 and G-9. Type III: the peak stress strain increases until the specimen is completely fragmented, as indicated in the curves of specimens G-15 and G-17.

It was found that the types of stress-strain curves are closely associated with the characteristics of deformation and failure modes of the rock specimens. As shown in Figure 5, the specimens G-1 and G-3 of type I remained intact and they were still able to bear load after impact (Figure 5(a)). This type is called unruptured state in which no fracture happens. Type II specimens G-8 and G-9 were fragmented by one or multicracks but they could still bear a load in the axial or loading direction after impact (Figure 5(b)). This type is called ruptured state. Type III specimens G-15 and G-17 were completely destroyed into numerous fragments and fine particles, and the specimens could not bear any load at all after impact (Figure 5(c)). This type is named fragmented state.

(a)

(b)

(c)

3.2. Failure Process

Figure 6 shows the failure processes of the three-type granite specimens during impact tests. The high-speed camera is connected with the oscilloscope. The oscilloscope will trigger the high-speed camera by recording the stress wave signal of the strain gauge on the incident bar. In order to determine the synchronization between the time of each photo taken by the camera and the loading process of the specimen, it is necessary to calculate the time that the stress wave propagates from the strain gauge to the specimen on the incident bar. The distance measured between the strain gauge and the specimen is 0.75 m, and the propagated speed of stress wave in the incident bar is 5450 m/s. Therefore, the propagated time of incident wave transmitted from the strain gauge to the end of the specimen is 137.61 μs. Since the high-speed camera takes a photo every 13.89 μs, the 11th one taken can be considered as the initial time of stress wave transmitted to the specimen. In this way, the time matching between the photos taken by the high-speed camera and the stress loading process is realized.

(a)

(b)

(c)

As shown in Figure 6(a), when the incident energy was at a low level, type I specimen G-1 remained intact at time 791.73 μs. The energy dissipated by the specimen was low, due to partly the low incident energy and partly the elastic rebound. Furthermore, the dissipated energy was possibly consumed in producing damage, microcracks, and so on in the specimen. At high-level incident energy, type II and III specimens G-8 and G-13 were fractured as illustrated in Figures 6(b) and 6(c). At 194.46 μs, some cracks were created in the two specimens. The movement/flight of one fragment can be seen in Figure 6(c) at 791.73 μs.

To study the crack propagation process of specimens in more detail, the stress-time and stress-strain curves of specimens G-8 and G-13 and the corresponding images taken by the high-speed camera are shown in Figure 7. According to the curves and photos, the failure processes of the specimens can be approximately divided into four stages: (1) linear deformation stage (O-A) in which stress-strain relation is approximately linear, (2) nonlinear deformation stage (A-B) in which cracks in and on the rock specimens are initiated and they start to propagate, (3) rapid crack propagation stage (B-C) in which cracks rapidly propagate but they do not make rock specimens broken, and (4) failure stage (C-D-E) in which rock specimens are completely fragmented into two or many pieces. To determine the boundary between the two stages, the photos close to each boundary were examined carefully.

(a)

(b)

(c)

(d)

Specimen G-8 looks intact during the first stage (O-A) from the pictures. Two distinct cracks appeared from both upper ends of the specimen during the second stage (A-B) and extended to the middle of the specimen in the stage that includes the rapid crack propagation stage and the failure stage (B-E).

Similar to G-8, specimen G-13 looks intact in the O-A stage. Small cracks were generated at the top of the specimen in A-B stage and extended to the middle of the specimen in the form of tensile and shear failure in B-C stage. During a short period of time, cracks on the specimen coalesced, forming a macrofracture surface and the specimen lost its bearing capacity (C-D-E). Based on the pictures, some cracks on the G-13 and G-8 specimens were initiated at 55–83 microseconds and crack extension happened after the peak stress peak was attained (see this from Figures 8(a) and 8(c)).

(a)

(b)

(c)

3.3. Energy Dissipation Characteristic

The test results for the incident energy and dissipated energy of the three-type specimens are presented in Table 2. To study the energy efficiency of the specimens, the energy consumption ratio was defined as the ratio of the energy dissipated by a specimen to the incident energy. It was found that as incident energy is greater than 106 J and smaller than 120 J, a rock specimen is ruptured; as incident energy is greater than 120 J, a specimen is usually fragmented. The former (energy 106 J) is defined as critical incident energy corresponding to ruptured state, while the latter (energy 120 J) is defined as the critical incident energy corresponding to fragmented state. As these energies are divided by the volume of the specimens, they are defined as specific critical incident energy corresponding to ruptured state and fragmented state, respectively. Their units are J/m3.

As shown in Figure 9, there are two different relations between dissipated energy and incident energy, dependent on the rock failure mode. For the specimens that remain in unruptured state after impact, the relation between dissipated energy and incident energy can be expressed bywhere is the dissipated energy of a specimen in unruptured state, is a coefficient, is a constant, and is the critical incident energy corresponding to ruptured state. As incident energy is greater than , rock will be certainly fractured. This linear energy dissipation characteristic is similar to the linear energy dissipation law of rock in static load test [17, 19].

Similarly, the relation between dissipated energy and incident energy in fragmented state can be described bywhere is the dissipated energy of specimens in the fragmented state, is coefficient, and is a constant. is the critical incident energy corresponding to fragmented state.

Figure 9 indicates that the dissipated energy increases much faster in the fragmented state than in the unruptured state.

3.4. Relation between Strain Rate and Energy Dissipation

As shown in Figure 8 based on Table 2, it can be seen that incident energy and dissipated energy increase with increasing strain rate, at two different speeds and at two states, unruptured state and fragmented one. Obviously, the speeds corresponding to incident energy and dissipated energy are higher in the fragmented state than in the unruptured state. In addition, Figure 8(c) shows that the energy consumption ratio increases with increasing strain rate, too. Differently, the energy consumption ratio increases faster in the unruptured specimens than in the fragmented one.

3.5. Size Distribution of Fragmented Specimens

Figure 10 shows the fragments at 11 mesh sizes of 5 fragmented specimens. Figure 11 presents the sieving results. The 11 mesh sizes and the sieving results are also shown in Table 3. In addition, even if a glass box was used to keep rock fragments inside during each test, it is inevitable that some fragments were ejected from the gap between the box and the test equipment, resulting in the loss of some fragments, especially fine particles. In order to determine such weight loss, the masses of each specimen before and after testing were weighed and the results are shown in Table 4, indicating that the weight loss varies from 0.6% to 5.4%.

(a)

(b)

(c)

(d)

(e)

Figure 11 shows that fragmentation becomes finer as incident energy increases; that is, the greater the incident energy is, the finer fragmentation is. This result can be also seen from the photos in Figure 10.

To study the influence of incident energy on the cumulative mass passing of the specimens, the three relations between incident energy and particle/mesh size were established for three accumulated mass passings, 100%, 50%, and 5%, as shown in Figure 12. It can be seen that when the incident energy was 296.92 J, all rock fragments passed through the sieve with a mesh size of 25 mm; that is to say, all the fragments were less than 25 mm. With the increase of incident energy from 158.61 J to 296.92 J, the particle sizes at 50% mass passing are 25 mm, 25 mm, 20 mm, 8 mm, and 6 mm, respectively. The particle sizes at 5% mass passing are 8 mm, 1.25 mm, 1.25 mm, 0.6 mm, and 0.28 mm, respectively. Figure 12 indicates that (1) at 100% mass passing the particle size is a constant as incident energy increases from 159 J to 263 J. As incident energy increases from 263 J, the particle size decreases, meaning that 263 J is a critical value for incident energy; that is, as incident energy is greater than 263 J, the maximum particle size is reduced. In reality, the particle size at 100% means the biggest fragment or boulder. (2) At 50% mass passing, the particle size is constant as incident energy is equal to or smaller than 184 J. After this energy, the particle size decreases quickly before incident energy reaches 263 J. After incident energy reaches 263 J, the particle size decreases slowly with increasing incident energy. Notice that 50% mass passing may represent average fragment size in practical rock fragmentation by either blasting or mechanical rock fracture under dynamic loads to a great extent. (3) At 5% mass passing, the particle size starts to decrease fast from the smallest incident energy 159 J to 184 J. After 184 J, the particle size decreases slowly with increasing incident energy. Note that all or most fine particles are included in 5% mass passing, the result for 5% mass passing is important for fines in rock fragmentation.

4. Discussion

4.1. Critical Incident Energy

The critical incident energy should be very useful for practical rock destruction such as percussive rock drilling, rock blasting, rock crushing, and ore grinding. As incident energy is smaller than the critical incident energy, most of the incident energy will be released due to elastic rebound, and part of the incident energy used in creating internal damage or microcracking is little. Therefore, in practical operation for rock destruction, the tested incident energy must be greater than the critical incident energy. This study shows that the critical incident energy is from 106 J/V to 120 J/V. In rock blasting, a specific charge in mining and tunneling is often from 0.3 to 1.2 kg/m³ (Zhang [24]). Assuming that the explosion energy of a commercial explosive is 4 MJ/kg and this explosion energy can be taken as the incident energy in blasting, we may find that, in rock blasting, about 1.2–4.8 MJ incident energy is used per square meter of rock. This is much greater than 106–120 J/V. The above discussion indicates that it is important to investigate the critical incident energy further and explore the applications of this critical incident energy to rock blasting since the quantity of the tests in this study is limited.

4.2. Energy Efficiency

Dissipated energy and energy consumption ratio increase with increasing strain rate. This does not mean that energy efficiency (the ratio of energy used in rock fracture to incident energy or input energy) increases with increasing strain rate because we do not know how much the kinetic energy and other energies are. In dynamic rock fracture tests by Zhang et al. [22], kinetic energy was determined and they found that the energy efficiency decreases with increasing loading rate. In dynamic compression tests, it is very difficult to determine the kinetic energy carried by flying fragments since they are many and in various sizes. Therefore, this is an issue to be studied in the future.

5. Conclusions

Based on the dynamic compression tests of granite specimens under different incident energies by using an SHPB testing system, the following conclusions can be drawn:(1)Under the impact of different incident energy, three states appear in the dynamic compression tests of the granite specimens, unruptured state, ruptured state, and fragmented state. These three states correspond to three different types of stress-strain curves.(2)There exists critical incident energy in dynamic rock compassion tests. As the incident energy is smaller than the critical incident energy, the rock will not be fractured, that is, unruptured; as incident energy is greater than the critical incident energy, the rock will be fractured or fragmented into different-size fragments. In this study, the critical incident energy is found to be approximately 106–120 J, namely, 0.29–0.33 MJ/m³.(3)Taking the critical incident energy as the boundary, there is a linear relationship in two intervals between the dissipated energy and the incident energy, which shows that there is a linear energy dissipation law in the dynamic compression test. When the tested incident energy is less than the critical incident energy, the dynamic compression test and static compression test have similar linear energy dissipation laws.(4)The energy consumption ratio of a rock specimen, either ruptured or unruptured, increases with increasing strain rate. The energy consumption ratio of an unruptured specimen increases faster than a fragmented specimen.(5)Fragment sizes at each mesh decrease with an increasing incident energy; that is, fragmentation becomes finer as incident energy increases.

Data Availability

All data generated or analyzed during this study are included in this published article.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Acknowledgments

This study was supported by the National Natural Science Foundation of China (Grant no. 41877272), the Fundamental Research Funds for the Central Universities of Central South University (Grant no. 2020zzts716), and the Fundamental Research Funds for the Central Universities of Southeast University (Grant no. 2242020R10023).

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Copyright © 2020 Fengqiang Gong et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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