4.7 Article

Investigation of crack propagation behavior on shales with different inclination based on ultra-fast time resolution method

Related references

Note: Only part of the references are listed.
Article Materials Science, Multidisciplinary

Research on dynamic failure mechanism of three-point bending beam with joint

Yaodong Xue et al.

Summary: The mechanical failure mechanism of rock masses containing internal joints under impact loading was studied using a combination of experimental and numerical methods. A dynamic failure mechanism model was proposed based on the research results, which is of great significance for understanding the failure process of rocks containing joints and for engineering applications.

MECHANICS OF ADVANCED MATERIALS AND STRUCTURES (2023)

Article Mechanics

The mode I fracture toughness alternation and crack propagation behavior evolution due to long-term Sc-CO2 saturation

Zijie Xu et al.

Summary: This study investigates the effects of supercritical carbon dioxide (Sc-CO2) on the fracture behavior of shale. The results show that after Sc-CO2 saturation, the fracture toughness, elastic modulus, and absorbed energy of shale decrease. High-speed camera images and scanning electron microscopy reveal changes in fracture mechanisms and surface roughness of shale after saturation. The generation of pore and cracks is identified as the main reason for the decrease in shale resistance to fracture. Additionally, saturated shale specimens require less energy to initiate and propagate cracks, with a main fracture mode of transgranular cracks.

ENGINEERING FRACTURE MECHANICS (2022)

Article Engineering, Mechanical

Experimental evaluation of the transient propagation fracture properties of rocks under dynamic mode I loading: An insight from digital image correlation

Youzhen Li et al.

Summary: Accurate measurement of dynamic fracture properties is crucial for the safety and stability of engineering applications. This study proposes an improved method to accurately calculate the transient kinetic energy and transient propagation fracture toughness of NSCB specimens under dynamic mode I loading, without specific assumptions. The results show a three-stage evolution of transient propagation velocity during the process of rock fracture, and a gradual increase in transient fracture energy. Loading rate dependence is observed in initiation fracture toughness, propagation fracture toughness, propagation velocity, and fracture energy.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2022)

Article Multidisciplinary Sciences

An ultrafast time-resolution method based on picosecond pulsed laser for determining rock fracture toughness at multipoint during the crack propagation

Mingyuan Zhang et al.

Summary: This study utilizes an innovative ultrafast time-resolution method based on a picosecond pulsed laser to investigate the mode-I crack propagation characteristics of fractured rock. The experimental results reveal repeated crack initiation, arrest, and re-initiation in the mode-I fracture process of the rock specimens. Moreover, the fracture rates of the specimens vary at different stages of the fracture process.

SCIENTIFIC REPORTS (2022)

Article Engineering, Mechanical

Numerical simulation of mesomechanical properties of limestone containing dissolved hole and persistent joint

Shuai Liu et al.

Summary: In this study, numerical models were used to analyze the mechanical properties and failure behavior of limestone rock mass with circular holes and persistent joints. The results showed that the presence of circular holes and persistent joints can decrease the compressive strength and elastic modulus of the rock samples. Additionally, the steep dip angles of the persistent joints have a significant control effect on the mechanical properties of the rock samples. The initiation cracks under uniaxial compression mainly occur in the persistent joints and rock blocks, with the crack initiation stress in the persistent joint being smaller than in the corresponding rock block.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2022)

Article Engineering, Geological

Failure Characteristics and Failure Process Investigation of Fine-Grained Sandstone under Impact Load by Ultrahigh Speed DIC and SEM Techniques

Guangyong Wang et al.

Summary: Using ultra-high-speed photography and digital image correlation technology, the dynamic failure characteristics and crack propagation process of fine-grained sandstone were investigated. The relationship between the mechanical properties and failure law of sandstone and strain rate from a micro perspective was studied using scanning electron microscopy. The results reveal that with an increase in strain rate, the failure process of the rock specimen shortens, and the time between critical moments becomes shorter. Moreover, the first crack on the rock surface initiates from the direction of the transmission rod, and the second crack penetrates the specimen first.

INTERNATIONAL JOURNAL OF GEOMECHANICS (2022)

Article Mining & Mineral Processing

Dynamic mechanical properties and wave propagation of composite rock-mortar specimens based on SHPB tests

Zhenyu Han et al.

Summary: Filled inclusions in rock discontinuities have a significant impact on the mechanical characteristics and stability of rock engineering. Experimental results show that the interlayer strength influences wave propagation and fracture processes. Increasing interlayer stiffness leads to higher transmission coefficient, strength, closure, and stiffness. The cement mortar layer acts as a buffer, while a weaker interlayer causes slabbing near the rock-mortar interface.

INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY (2022)

Article Geosciences, Multidisciplinary

Experimental investigation on the spatio-temporal-energy evolution pattern of limestone fracture using acoustic emission monitoring

Chunlai Wang et al.

Summary: The spatio-temporal-energy evolution characteristics of strong acoustic emission events on the crack surface during the process of a complete limestone rupture were investigated. The study demonstrated the generation, expansion, and interpenetration of microcracks in rock samples. The results showed that the spatial distribution of strong acoustic emission events could effectively represent the process of internal deformation and rock fracture. The proposed cumulative energy formula for acoustic emission events quantitatively described the process of rock crack development.

JOURNAL OF APPLIED GEOPHYSICS (2022)

Article Engineering, Mechanical

Experimental study on crack propagation and failure mode of fissured shale under uniaxial compression

Xiong Zhang et al.

Summary: Analyzing the crack propagation and failure mode of shale reservoirs is essential for hydraulic fracturing. In this study, uniaxial compression tests were conducted to examine the crack initiation and propagation of shale with double fissures of different inclination angles. The results showed that as the inclination angle of fissures increased, the peak strength and strain of shale increased, the initiation stress increased, and tensile-shear failure became the dominant failure mode.

THEORETICAL AND APPLIED FRACTURE MECHANICS (2022)

Article Mechanics

Evaluation of the fracture mechanisms and criteria of bedding shale based on three-point bending experiment

Yingjie Li et al.

Summary: The study discovered that shale exhibited three stages of strain field during three-point bending, with strain localization being a key phase of crack evolution. Additionally, as loading increased, cracks in shale specimens transformed into mixed-mode cracks. The new fracture criterion (GMTS-SB) was effective in predicting crack propagation and fracture resistance in bedding shale.

ENGINEERING FRACTURE MECHANICS (2021)

Article Mechanics

Research on the anisotropic fracture behavior and the corresponding fracture surface roughness of shale

Cunbao Li et al.

Summary: Studying the anisotropic fracture behavior of shale is crucial for evaluating the development of a stimulated reservoir volume. The fracture toughness decreases with increasing bedding dip angle, reaching maximum and minimum values at 0 degrees and 90 degrees, respectively, with a ratio of 1.60. The crack propagates along the bedding plane when the dip angle is higher than 45 degrees.

ENGINEERING FRACTURE MECHANICS (2021)

Article Multidisciplinary Sciences

In-situ observation of trapped carriers in organic metal halide perovskite films with ultra-fast temporal and ultra-high energetic resolutions

Kanishka Kobbekaduwa et al.

Summary: In this study, ultrafast photocurrent spectroscopy was used to observe the dynamics of trapped carriers in organic methyl ammonium lead halide perovskite thin films in real time. The results revealed a phonon-assisted tunneling mechanism and hopping transport mechanism, providing insights into trap dynamics in high defect-tolerant perovskites. The study also established a foundation for understanding trap states with ultra-fast temporal and ultra-high energetic resolution.

NATURE COMMUNICATIONS (2021)

Article Energy & Fuels

Experimental study on the feasibility of microwave heating fracturing for enhanced shale gas recovery

Tianyu Chen et al.

Summary: The study explores the responses of Longmaxi shale to different microwave stimulation methods and paths, finding that a complex thermally-induced fracture network can gradually form under intermittent microwave irradiation, leading to changes in various petrophysical parameters of the shale.

JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING (2021)

Article Mechanics

Experimental and numerical investigation on shale fracture behavior with different bedding properties

Bo Lei et al.

Summary: Research on the crack evolution mechanism and fracture behavior of bedding shale is important for shale gas exploitation. Mechanical properties, particularly the anisotropy of shale, significantly affect hydraulic fracture initiation and propagation. The study found that the mechanical properties of weak bedding planes have a significant impact on fracture behavior, and fractal method can quantitatively characterize the evolution of microcracks in bedding shale.

ENGINEERING FRACTURE MECHANICS (2021)

Article Engineering, Geological

Experimental Study on the Anisotropic Mechanical Properties of Oil Shales Under Real-Time High-Temperature Conditions

Guoying Wang et al.

Summary: This study investigated the anisotropic mechanical and acoustic emission characteristics of oil shale from room temperature to 600 degrees C using a real-time high-temperature uniaxial rock testing machine and an acoustic emission test system. The results showed that the elastic modulus and compressive strength of oil shale exhibit a trend of first decreasing and then increasing with temperature, reaching minimum values at 400 degrees C. The critical temperature for the mechanical parameters of oil shale perpendicular and parallel to bedding direction are 400, 100, and 400 degrees C, respectively.

ROCK MECHANICS AND ROCK ENGINEERING (2021)

Article Engineering, Geological

Stress-Energy Mechanism for Rock Failure Evolution Based on Damage Mechanics in Hard Rock

Chunlai Wang et al.

ROCK MECHANICS AND ROCK ENGINEERING (2020)

Article Engineering, Geological

Investigation on the Failure Characteristics and Fracture Classification of Shale Under Brazilian Test Conditions

Gan Feng et al.

ROCK MECHANICS AND ROCK ENGINEERING (2020)

Article Mechanics

Strain burst vulnerability criterion based on energy-release rate

Selahattin Akdag et al.

ENGINEERING FRACTURE MECHANICS (2020)

Article Energy & Fuels

The effect of shale bedding on supercritical CO2 jet fracturing: A experimental study

Can Cai et al.

JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING (2020)

Article Engineering, Geological

Effects of strain rate on fracture toughness and energy release rate of gas shales

Bankim Mahanta et al.

ENGINEERING GEOLOGY (2017)

Review Engineering, Geological

High-Speed Photography and Digital Optical Measurement Techniques for Geomaterials: Fundamentals and Applications

H. Z. Xing et al.

ROCK MECHANICS AND ROCK ENGINEERING (2017)

Review Mechanics

Mechanics of Hydraulic Fractures

Emmanuel Detournay

ANNUAL REVIEW OF FLUID MECHANICS, VOL 48 (2016)

Review Geosciences, Multidisciplinary

Natural fractures in shale: A review and new observations

Julia F. W. Gale et al.

AAPG BULLETIN (2014)

Article Engineering, Geological

Three-point bending test investigation of the fracture behavior of siltstone after thermal treatment

Jian-ping Zuo et al.

INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES (2014)

Article Engineering, Geological

ISRM-Suggested Method for Determining the Mode I Static Fracture Toughness Using Semi-Circular Bend Specimen

M. D. Kuruppu et al.

ROCK MECHANICS AND ROCK ENGINEERING (2014)