A Real-Time Visual Investigation on Microscopic Progressive Fatigue Deterioration of Granite Under Cyclic Loading

Fan, L.F.; Qiu, B.; Gao, Ju; Du, Xiuli

doi:10.1007/s00603-023-03326-y

Cited by 13 publications

(2 citation statements)

References 47 publications

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“…Thermal stress is generated because of thermal expansion mismatches between adjacent minerals. Once the thermal stress reaches the criteria, propagation of initial cracks and generation of new cracks occur to reduce the mechanical properties of rocks [17][18][19][20]. Thermal stress is generated in microwave-heated rocks, which are strongly influenced by theirmineral texture.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Microwave-Induced Damage in Granite Aggregates Influenced by Mineral Texture

Yuan,

Zhao

2024

Buildings

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The use of microwave energy to recycle high-quality coarse aggregates from waste concrete or assist hard rock breakage in underground building engineering is promising. Controlling or promoting the damage of coarse aggregates, i.e., hard rocks, under microwave irradiation is a crucial issue faced by these techniques. Understanding the damage mechanisms of hard rocks exposed to microwaves is thus urgent. Fracture toughness is a significant mechanical parameter of rocks that reflects their ability to resist crack propagation and damage evolution. In this study, the fracture toughness degradation of microwave-heated granite was investigated by combining experimental investigations and numerical simulations. A three-point-bending (TPB) experiment was conducted on granite specimens after microwave irradiation. A coupled electromagnetic–thermal–mechanical model considering the actual mineral texture of the granite specimen was established. The evolution of the temperature gradient and stress field near the initial notch tip were investigated. The results suggest that the microwave-induced maximum temperature gradient and stress in granite are at the plagioclase–quartz (Pl–Qtz) interfaces or inside the Pl near the boundary. The region of cracking initiation was defined as the damage zone, which could be obtained by comparing the microwave-induced thermal stress with the critical value. The fracture toughness degradation, which corresponds to the evolution of the damage zones, can be divided into two stages. A relatively rapid decrease in fracture toughness in the first stage is primarily caused by the spread of the scattered damage zones along the Pl–Qtz interfaces; subsequently, a gentler fracture toughness degradation results mainly from the extension of the previous damage zones.

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Section: Introductionmentioning

confidence: 99%

Analysis of Microwave-Induced Damage in Granite Aggregates Influenced by Mineral Texture

Yuan,

Zhao

2024

Buildings

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“…Fan, utilizing real-time CT scanning technology, analyzed the mesoscopic damage evolution features of granite under cyclic load. It was discovered that rock porosity remained unaffected when subjected to cyclic stress lower than 46.04% of its uniaxial compressive strength [10]. Erarslan examined the response characteristics of rock fracture resistance to cyclic load, observing a maximum reduction in static fracture toughness (KIC) by 27% under sinusoidal cyclic load [11].…”

Section: Introductionmentioning

confidence: 99%

Simulation Analysis of the Influence of Amplitude on Deformation and Fracture Characteristics of Hard Rock under Ultrasonic Vibration Load

Zhang,

Wang,

Niu

et al. 2023

Processes

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The utilization of auxiliary tools employing ultrasonic high-frequency vibration to enhance rock breaking efficiency holds significant potential for application in underground hard rock excavation engineering. To investigate the failure mechanism of rocks under high frequency ultrasonic vibration load, this study employs particle flow software PFC2D for numerical simulation. By incorporating boundary conditions from actual ultrasonic vibration rock breaking experiments and utilizing a parallel bond model to construct the rock, we analyze the deformation, damage, fracture, and energy evolution process of hard rocks subjected to vibrational loads. The results demonstrate that the maximum displacement in hard rocks increases nearly linearly with vibrations until reaching 5.0199 × 10−3 m, after which it plateaus. Additionally, macroscopic fissures formed during rock failure exhibit an X-shaped pattern. Furthermore, based on our model, we examine the impact of amplitude variation on hard rocks with an equal number of cycles (5,000,000 cycles). Under ultrasonic vibration loads, amplitude influences the total input energy within the rock system. While increasing amplitude does not alter maximum deformation in rocks, it enhances fragmentation degree, fracture degree and energy dissipation coefficient—thereby improving rock breaking efficiency.

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Study on Fracture Surface Damage and Fluid Flow Characteristics of Hot Dry Rock with Different Failure Modes under Repeated Thermal Shock

Deng,

Zhao,

et al. 2023

Rock Mech Rock Eng

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A Real-Time Visual Investigation on Microscopic Progressive Fatigue Deterioration of Granite Under Cyclic Loading

Cited by 13 publications

References 47 publications

Analysis of Microwave-Induced Damage in Granite Aggregates Influenced by Mineral Texture

Analysis of Microwave-Induced Damage in Granite Aggregates Influenced by Mineral Texture

Simulation Analysis of the Influence of Amplitude on Deformation and Fracture Characteristics of Hard Rock under Ultrasonic Vibration Load

Study on Fracture Surface Damage and Fluid Flow Characteristics of Hot Dry Rock with Different Failure Modes under Repeated Thermal Shock

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