The Loading Rate Effect on the Fracture Toughness of Marble Using Semicircular Bend Specimens

Gong, Fengqiang; Wang, Yunliang; Wang, Shanyong

doi:10.1155/2020/8876099

Cited by 4 publications

(3 citation statements)

References 44 publications

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“…Dai et al [30] expanded the application of the cracked chevron notched Brazilian disc (CCNBD) method to dynamic rock fracture testing in order to determine the initial fracture toughness under dynamic loading conditions. Gong et al [31] utilized an INSTRON testing machine and an enhanced SHPB testing system to conduct a series of dynamic fracture tests on semicircular bend (SCB) marble specimens, proposing a continuous model for the dynamic increase factor of fracture toughness that quantitatively expresses the relationship between loading rate and rock's dynamic fracture toughness. Li et al [32] conducted a numerical investigation on the dynamic fracture behavior of notched semicircular bend (NSCB) rock specimens with varying notch dip angles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Wu,

Du,

Wang

et al. 2024

Advances in Civil Engineering

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The structural stability of engineering rock mass under dynamic disturbance is directly associated with the fracture mechanics properties in engineering practice. Fully understanding the rock’s fracture mechanical behavior and crack evolution caused by stress concentration at the crack tip in engineering rock mass under dynamic load can offer useful insight into the rock’s dynamic fracture mechanism. A dynamic test using split-Hopkinson pressure bar (SHPB) test system was performed on a single prefabricated fissure sandstone centrally cracked Brazilian disk (CCBD) specimens. Based on the theory of fracture mechanics and one-dimensional stress wave theory, the dynamic crack initiation criterion of CCBD specimen is proposed, and the regression model of sandstone’s dynamic fracture toughness under the coupling effect of fissure angle and strain rate is established by using response surface methodology (RSM). The influence of strain rate and fissure angle on stress wave characteristics, dynamic tensile mechanical behavior, and fracture mechanics characteristic was investigated in this study. The findings demonstrate that: (1) The fissure angle plays a pivotal role in determining the failure mode of sandstone. As the fissure angle increases, three distinct failure modes emerge in the sandstone specimens, while variations in strain rate have minimal impact on the fracture mode of these specimens. (2) Alterations in the fissure angle result in changes to the waveform of transmitted waves. When the fissure angle is below 30°, the transmitted wave exhibits “double peak” characteristics; when it exceeds 30°, a “single peak” waveform is observed. This phenomenon can be attributed to diffraction principles governing incident waves. (3) When the impact pressure is 0.2 MPa, the peak load initially exhibits an increase followed by a decrease, with the peak load reaching its maximum at a fracture angle of 60°; when the impact pressures are 0.3 and 0.5 MPa, there exists a negative correlation between the peak load and the fissure angle. (4) The influence of strain rate on sandstone’s fracture resistance is predominant, with alterations in fissure angle exerting an auxiliary effect on this property. The research results can provide a theoretical and experimental basis for dynamic disaster prevention in urban underground space.

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Section: Introductionmentioning

confidence: 99%

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Wu,

Du,

Wang

et al. 2024

Advances in Civil Engineering

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“…The effect of loading rate on rock mechanical behavior has taken some attention from the scientific community [11][12][13][14][15]. Zhao et al [16] studied the effect of loading rate on coal strength by three-dimensional reconstruction modelling technology and proposed an empirical relationship between coal strength and loading rate.…”

Section: Introductionmentioning

confidence: 99%

Loading Rate and Bedding Plane Coupled Effect Study on Coal Failure under Uniaxial Compression: Acoustic Emissions and Energy Dissipation Analysis

et al. 2022

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The mechanical behavior of coal is significantly influenced by the loading rate and bedding plane. In this paper, the uniaxial compression tests at different loading rates were conducted on coal specimens with vertical bedding (CSVB) and coal specimens with parallel bedding (CSPB), which were prepared by the coal with bursting liability from the Ordos deep mining areas, China. The results show that the uniaxial compressive strengths of CSVB and CSPB are positively correlated with the loading rate. The peak values of acoustic emission (AE) counts and accumulated absolute AE energy of CSVB and CSPB increase with the loading rate, and the AE parameters of CSVB are larger than those of CSPB. The variation rules of input energy density and elastic energy density are similar for CSVB and CSPB, but the variation rules of dissipated energy density in stage IV are different. As the axial load increases, the energy storage rate and energy dissipation rate of both coal specimen types increase and decrease, respectively. The bedding planes of coal and the loading conditions in the field should be fully considered when identifying the bursting liability of coal and forecasting coal burst. This study can provide a reference for coal burst warning and prevention under similar geological conditions in Ordos deep mining areas.

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“…Finally, the correlation between damage variable and dynamic peak stress was established. Additionally, a larger number of impact tests were carried out to investigate the mechanical properties of post heated rock with dynamic loads exerted by the splitting Hopkinson pressure bar (SHPB) system, which had been considered an invaluable device providing dynamic loading on various materials [10][11][12][13]. Yao et al [14] carried out dynamic impact tests on Longyou sandstone specimens subjected to temperatures with various strain rates, and test results illustrated that loading rate presented positive effect on dynamic tensile strength, while the high temperature showed negative effect.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Damage Characteristic and Constitutive Model of Deep Sandstone under Coupled High Temperature and Impact Loads

Zhang

Yang

2021

Geofluids

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To investigate the coupling damage characteristics of rock after high-temperature treatment under impact load, dynamic uniaxial compression tests for deep sandstone specimen under laboratory conditions varying with high temperature (i.e., 25°C, 100°C, 300°C, 500°C, 700°C, and 900°C) and strain rate (i.e., 170 s-1, 205 s-1, and 240 s-1) were performed using splitting Hopkinson pressure bar (SHPB) system. Coupling damage variable of deep sandstone was deduced based on the Lemaitre equivalent strain theory. Moreover, the damage parameters of deep sandstone were systematically determined according to the test data, and the effects of high temperature and strain rate on damage growth curves were investigated. Finally, a dynamic compound damage constitutive model, which could consider the coupling damage, was established and verified to describe the dynamic mechanical characteristic of deep sandstone. Theoretical and experimental results indicated that the simulated stress-strain curves matched the test data well and the proposed coupling damage constitutive model could reflect the high temperature-induced weakening and strain rate strengthening effect.

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The Loading Rate Effect on the Fracture Toughness of Marble Using Semicircular Bend Specimens

Cited by 4 publications

References 44 publications

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Experimental Study on Dynamic Tensile Mechanical Behavior and Fracture Mechanical Characteristics of Sandstone with a Single Prefabricated Fissure

Loading Rate and Bedding Plane Coupled Effect Study on Coal Failure under Uniaxial Compression: Acoustic Emissions and Energy Dissipation Analysis

Investigation on Damage Characteristic and Constitutive Model of Deep Sandstone under Coupled High Temperature and Impact Loads

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