(PDF) The Mechanical Properties of Granite under
The new technique of using ultrasonic vibration to break hard rock is still in the experimental stage, but it has significant potential for improving the efficiency of hard rock crushing.This paper takes the representative hard rock (granite) as the research object, takes the rock microstructure as the starting point, adopts the orthogonal test Study on Granite Crushing Law under Ultrasonic Multi
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The use of power ultrasound in mining ScienceDirect
The uses of power ultrasound are addressed in three aspects: (1) determination of the stress state of rock mass for safety reasons and to plan mining The state of the art for the machining of stone uses geometrically undefined cutting edges. This paper focuses on the geometrically defined cutting of Hybrid cutting of granite by use of ultrasonic assistance
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Ultrasonic Spectrum Analysis of Granite Damage
Based on the self-developed dry-coupled small-size ultrasonic monitoring technology, this paper explored the acoustic spectral characteristics of the whole process of rock damage evolution in multiple Ultrasonic vibration is a new type of rock crushing method that has received widespread attention in recent years. It is a kind of ultra-high frequency cyclic Damage Evolution of Granite under Ultrasonic Vibration with
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Evaluating the effect of radio-frequency pre-treatment on granite rock
Current research studies have found that the mineral liberation process can be enhanced through the use of pulsed power, ultrasound pre-treatment and Ultrasonic high-frequency vibrational fracture technology can compensate for the deficiencies of traditional fracture methods and has promising applications in Mesoscopic Damage and Fracture Characteristics of Hard Rock
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Microcrack Growth Properties of Granite under Ultrasonic
1. Introduction Using ultrasonic vibration technology to break hard rock is a new method in the field of geological exploration [ 1 ]. Vibration can promote the In the construction of mountain tunnels, the increasing proportion of hard rock stratum enhances the difficulty of rock breaking by tunnel boring machine (TBM). As a type of cyclic load with ultrahigh Rock Crushing Analysis of TBM Disc Cutter
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The role of ultrasonic velocity and Schmidt hammer
The present work deals with the use of Ultrasonic Pulse Velocity and Schmidt Hammer Hardness test to predict the mechanical properties of weathered granite. Cylindrical specimens with the length to diameter ratio of two were prepared for this study and were characterized based on different weathering states.Ceramic rock slab is a kind of new material with the advantages of high hardness, wear resistance, and high-temperature resistance, and it is widely used in industry and households. However, problems such as easy chipping and serious tool wearing occurred in conventional grinding (CG). To overcome these challenges, this work Study on cutting performance of ceramic rock slab machined
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Article Experimental investigation on compressive
Ultrasonic Characteristic and Cracks Distribution of Granite Rock Irradiated by a Moving Laser Beam Lianfei Kuang 1,Lipeng Sun 1,Dongxu Yu 1,Yijiang Wang 1, *, Zhaoxiang Chu 1 and Jo Darkwa 2This chapter deals with the application of power ultrasound in the mining industry. It includes an overview of mining operations and four sections covering: the in-situ determination of rock mass stress condition by ultrasound for rock stability analysis, the use of power ultrasound to assist ore particle size reduction, application of power ultrasound Applications of power ultrasound in mining ScienceDirect
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Effect of cyclic loading on mechanical and ultrasonic
Rock bursts, coal bumps, and other disasters may occur due to the failure of rock masses in tunnels and mining excavations (Zuo et al. 2009; Shreedharan and Kulatilake 2016). Therefore, evalua-tions of strength and deformation behaviors of granite are significant for accurate stability estimations in rock engineer-Ultrasonic Testing or Ultrasonic Flaw Detection is a type of non-destructive Testing that employs high-frequency ultrasound waves to perform inspections and measurements. Ultrasonic inspection is often used to discover and evaluate flaws, measure dimensions, characterize materials, and more. Sound waves with a frequency greater than 20 kHz A Complete Guide To Ultrasonic Crack Detection Technique
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Research Article
e new technique of using ultrasonic vibration to break hard rock is still in the experimental stage, but it has significant potential behavior of the granite under ultrasonic vibration was observed. e results of this experiment indicate that the granite samples underwent elastic deformation, plastic deformation, and damage during thisUsing full-field infrared thermography, we visualize stress-induced temperature changes and validate stress images obtained from diffuse ultrasound. We demonstrate that the inversion with a good resolution can be achieved with only a limited number of receivers distributed around a single source, all located at the free surface of Monitoring Local Changes in Granite Rock Under Biaxial
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65,000-years of continuous grinding stone use at
Grinding stones and other ground implements are a fundamental component of the human technological panoply that first emerged in the Levant, Africa, and Europe from at least 780 ka ago 1,2,3,4,5,6Ultrasonic machining is the oscillatory motion of a tool that chips away material, like a jackhammer chipping away at a piece of concrete pavement, except much faster and not as measurable in its reciprocation. The Advanced Machining in Ancient Egypt Spirit
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Monitoring Local Changes in Granite Rock Under
Xie et al. also conducted a laboratory observation of stick-slip failure on 1.5 m granite fault by measuring temporal velocity changes with a 10 −6 relative resolution of diffuse ultrasound. The results of Using ultrasonic, Liu, Wang 16 conducted a study to evaluate coal's deformation in the presence of cyclic loads. Zhang, Zhao 17 demonstrated the capability of AE technology in uncovering thermal damage evolution of rock. These non-destructive testing methods are widely used to obtain valuable information about rock sample's Deformation behaviour, crack initiation and crack
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Research on Grinding Force of Ultrasonic Vibration-Assisted Grinding
C/SiC composite material is the best choice for important parts such as the hot-end structure of aerospace vehicles. Research and optimization of the cutting force of ultrasonic vibration-assisted grinding are of great significance when it comes to revealing the machining mechanism of C/SiC composites and realizing low-damage and efficient Rotary ultrasonic machining is a cost-effective and precise machining method for hard and brittle materials. Aiming at processing SiCp/Al composites, a rotary ultrasonic grinding spindle is proposed in the present study. Expressions were established to calculate the displacement, rotation angle, bending moment, and shear force of the Investigation of the longitudinal-flexural resonating spindle
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Mechanism and Experiment Study of Non-Contact Ultrasonic Assisted Grinding
Ultrasonic-assisted grinding processing can effectively reduce the surface roughness and enhance the processing efficiency in the processing of hard and brittle materials. However, the most common ultrasonic assisted grinding is a type of contact ultrasonic grinding where the grinding tool directly contacts the workpiece, which means The surface roughness of nano-composite ceramics machined by means of multi-frequency ultrasonic vibration grinding was investigated with the diamond grinding wheel dressed by elliptical vibration.Hybrid cutting of granite by use of ultrasonic assistance
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Microcrack Growth Properties of Granite under Ultrasonic
The failure of most rock materials is essentially a process of crack initiation and propagation. It is of great significance to study the microcrack growth characteristics of granite under ultrasonic high-frequency excitation for understanding the failure mechanism of rock under ultrasonic vibration. In this paper, the experimental and numerical As a type of ultra-high frequency loading, ultrasonic vibration is an effective way to break the rock at high rates. Exploring the influence of various factors on the loading effect is essential for its effective application to assist drilling. In this study, the damage evolution of granite under ultrasonic vibration with different amplitudes was investigated. Damage Evolution of Granite under Ultrasonic Vibration with
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