Dynamic Mechanical Properties and Failure Mode of Artificial Frozen Silty Clay Subject to One‐Dimensional Coupled Static and Dynamic Loads

Ma, Dongdong; Ma, Qinghai; Yao, Zhaoming; Yuan, Pu; Zhang, Rongrong

doi:10.1155/2019/4160804

Cited by 10 publications

(9 citation statements)

References 27 publications

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“…Procedure. SHPB equipment has been successfully used to investigate the dynamic behaviors of materials, such as rock [32,33], concrete [34,35], mortar [36], and frozen soil [37]. A split Hopkinson pressure bar with a diameter of 74 mm in the experiment is employed to investigate the dynamic mechanical behavior of readymixed concrete in uniaxial load and passive confining pressure states, as shown in Figure 2.…”

Section: Apparatus and Experimentsmentioning

confidence: 99%

SHPB Test and Microstructure Analysis on Ready‐Mixed Concrete in Uniaxial Load and Passive Confining Pressure States

Zhang

Duan

Yang

2019

Shock and Vibration

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Ready-mixed concrete has been used as a support in mine roadways, where the impact load of blasting excavation can cause damage to the concrete support of the roadway. However, limited studies are available on the effect of water content, storage period, and impact pressure on dynamic mechanical properties of ready-mixed concrete in uniaxial load and passive confining pressure states. To investigate the effect of water contents (0%, 1.0%, 1.5%, and 2.0% by mass of dry sand), storage periods (0 d, 3 d, 7 d, 15 d, 20 d, and 30 d), and impact pressures (0.6 MPa and 0.9 MPa) on dynamic mechanical properties of ready-mixed concrete in uniaxial load and passive confining pressure states, the dynamic compression test using split Hopkinson pressure bar (SHPB) has been carried out. In addition, the microscopic test based on the scanning electron microscope (SEM) is conducted to analyze the effect of water content and storage period on the microstructure of ready-mixed concrete. The experimental results show that under the conditions of uniaxial load and passive confining pressure, the dynamic compressive strength of ready-mixed concrete decreases with the increase of water content and storage period but increases with the increase of impact pressure. At the same impact pressure, the dynamic compressive strength in passive confining pressure state is larger than that in uniaxial load state. The dynamic stress-strain curves of ready-mixed concrete in uniaxial load and passive confining pressure states can be divided into three stages: elastic stage, plastic stage, and failure stage. The peak strain increases with increasing impact pressure, and the peak strain in passive confining pressure state is more than that in uniaxial load state. The degree of damage for ready-mixed concrete specimens increases with the increase of the storage period and water content; however, the damage of specimens in passive confining pressure state is less than that of specimens in uniaxial load state. Meanwhile, an analysis to the microstructural mechanism of water content and storage period inside of ready-mixed concrete has been performed.

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Section: Apparatus and Experimentsmentioning

confidence: 99%

SHPB Test and Microstructure Analysis on Ready‐Mixed Concrete in Uniaxial Load and Passive Confining Pressure States

Zhang

Duan

Yang

2019

Shock and Vibration

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“…e literature [18][19][20][21] studied the temperature effect, strain rate effect, the destruction process, and energy transfer characteristics of different types of soil under freezing. e law of dynamic mechanical parameters of a coal specimen changing from room temperature to a negative temperature was analyzed by Wang et al [22], and the coal-rock stress-strain curve characteristics subject to the low-temperature-impact loading coupling effect were discussed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study of Dynamic Mechanics Characteristics of Saturated Marble under Low Temperature

Yang

Wang

2021

Shock and Vibration

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The effect of low temperature on dynamic mechanical properties of low-temperature frozen marble at a high strain rate was studied by a dynamic impact test. The influence of temperature changes (25°C–40°C), especially negative temperature changes, on dynamic strength, peak strain, and failure mode of the marble was analyzed. Combined with the fracture morphology, the reasons for the deterioration of dynamic mechanical strength of water-saturated marble at lower negative temperatures were investigated. The experimental results show that the dynamic mechanical properties of marble are significantly affected by the change of freezing temperature. The dynamic strength firstly decreases and then increases with the decrease of temperature in the range of 25°C to −20°C, but the dynamic strength decreases sharply after −20°C. The peak strain increases first, then decreases, and then increases, and the inflection point temperature of the change is −5°C and −20°C, respectively, which is completely different from the static load test results of frozen rock at low temperature. According to fracture morphology analysis, water-ice phase transformation at −5°C leads to the nucleation and expansion of a large number of microcracks and micropores in marble, and the interaction between slip separation cracks and microstructures caused by shear deformation under impact separates the massive crystals inside the rock into microscopic crystals, thus reducing the bearing capacity and strength of marble. From −5°C to −20°C, the ice medium and marble matrix contract when cooled, and the microcracks and micropores caused by the phase transition gradually close during the contraction process, the integrity of the rock is restored, and the dynamic strength of the rock is increased. At −20°C, there is a great difference in the shrinkage rate of the marble matrix and the ice medium, and the internal microstructure increases. Meanwhile, the impact amplifies the brittleness of the rock at low temperatures, leading to a sharp decrease in the dynamic strength of the marble.

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“…Li et al [ 25 , 26 , 27 ] improved the traditional Hopkinson pressure bar and applied both axial static pressure and lateral confining pressure on the specimen simultaneously. The active confining-pressure technique has also been used to research the dynamic mechanical properties of rocks [ 28 , 29 , 30 ], glass beads [ 31 ], and artificial frozen silty clay [ 32 , 33 , 34 ]. Albertini et al [ 35 , 36 ] designed a 3D static and dynamic experimental device that could pre-load axial pressure on the specimen in three dimensions under 1D impact loading.…”

Section: Introductionmentioning

confidence: 99%

Development of a True-Biaxial Split Hopkinson Pressure Bar Device and Its Application

et al. 2021

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Although highly desirable, the experimental technology of the dynamic mechanical properties of materials under multiaxial impact loading is rarely explored. In this study, a true-biaxial split Hopkinson pressure bar device is developed to achieve the biaxial synchronous impact loading of a specimen. A symmetrical wedge-shaped, dual-wave bar is designed to decompose a single stress wave into two independent and symmetric stress waves that eventually form an orthogonal system and load the specimen synchronously. Furthermore, a combination of ground gaskets and lubricant is employed to eliminate the shear stress wave and separate the coupling of the shear and axial stress waves propagating in bars. Some confirmatory and applied tests are carried out, and the results show not only the feasibility of this modified device but also the dynamic mechanical characteristics of specimens under biaxial impact loading. This novel technique is readily implementable and also has good application potential in material mechanics testing.

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Dynamic Mechanical Properties and Failure Mode of Artificial Frozen Silty Clay Subject to One‐Dimensional Coupled Static and Dynamic Loads

Cited by 10 publications

References 27 publications

SHPB Test and Microstructure Analysis on Ready‐Mixed Concrete in Uniaxial Load and Passive Confining Pressure States

SHPB Test and Microstructure Analysis on Ready‐Mixed Concrete in Uniaxial Load and Passive Confining Pressure States

Experimental Study of Dynamic Mechanics Characteristics of Saturated Marble under Low Temperature

Development of a True-Biaxial Split Hopkinson Pressure Bar Device and Its Application

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