A microscopic study on kerfs in rocks subjected to abrasive waterjet cutting

Arab, Paola Bruno; Celestino, Tarcísio Barreto

doi:10.1016/j.wear.2020.203210

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…Diamond grinding wheel precision machining requires the use of artificially synthesized diamond particles, which have rapid wear and high costs [4][5][6]. Abrasive water jet (AWJ) is a machining technique that is noncontact, offers no heat-affected zone, and produces no harmful waste [7][8][9]. Therefore, for machining tungsten steel, it can be considered a more economical, effective, and environmentally friendly approach.…”

Section: Introductionmentioning

confidence: 99%

Effect of initial temperature on cutting speed in liquid nitrogen assisted abrasive suspension jet machining of tungsten steel

Qiang,

Teng,

Fei

et al. 2024

Preprint

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Liquid nitrogen assisted abrasive suspension jet (LN2-ASJ) is a combined machining method of cooling before cutting, which can greatly improve the efficiency of ASJ machining tungsten steel (hard alloy). The reduction in machining temperature changes the mechanical properties of the material, thereby affecting the fracture mode and failure speed. This paper focused on YG8/YG20 tungsten steel, analyzed its failure process at low temperatures, established a mathematical model for cutting speed, elucidated the effect of initial temperature on cutting speed, and conducted LN2-ASJ cutting experiments. The results showed that ductile fracture always occurs at the initial kerf. As the kerf depth increases, tungsten steel may begin to undergo brittle fracture, with the occurrence coordinates of brittle fracture depending on the initial temperature. The cutting speed in the brittle fracture area (18.88-21.21mm/s) is approximately 8 times that in the ductile fracture area (2.39-3.87mm/s), with the optimal cutting performance achieved when the initial temperature is controlled at -80°C. Compared to room temperature, LN2-ASJ increased the average cutting speed of YG8 by 32% (from 3.71mm/s to 4.90mm/s) and that of YG20 by 37% (from 3.95mm/s to 5.43mm/s).

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Section: Introductionmentioning

confidence: 99%

Effect of initial temperature on cutting speed in liquid nitrogen assisted abrasive suspension jet machining of tungsten steel

Qiang,

Teng,

Fei

et al. 2024

Preprint

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“…Hlavacova et al 7 investigated the effect of abrasive density and hardness on rock cutting efficiency. Paola et al 8 investigated the microscopic damage mechanisms of AWJ used to destroy rock surfaces. Liu et al 9 studied the damage characteristics of concrete specimens impacted by AWJ.…”

Section: Introductionmentioning

confidence: 99%

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Liu

Ling

et al. 2023

Structural Concrete

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As time passes, a significant number of reinforced concrete (RC) constructions will require maintenance and transformation. RC repair and renovation often require localized crushing and removal of the distressed area. Abrasive water jet (AWJ) crushing RC has significant advantages in terms of safety, environmental protection, and quality. However, AWJ works with high specific energy consumption and the effective crushing range of the jets is small, and the key to solving these problems lies in an in‐depth study of the general destructive law and cracking mechanism of RC materials under the action of high‐speed liquid impact. Therefore, this thesis focuses on the above key scientific issues, combining mechanical impact tests, smooth particle hydrodynamics numerical simulation methods and computer tomography scans techniques to carry out systematic research. Through the study, it is found that: The fracture characteristics of RC are mainly reflected in crushing pits and cracks, which will produce macrocracks extending along the reinforcement on the side of RC. AWJ impacting RC is mainly divided into three stages: crater formation, upper concrete fragmentation, and concrete damage development in the reinforcement impact area. During the whole impact process, the shear stress, compressive stress and tensile stress of the reinforcement will change continuously with the increase of the impact time of the AWJ.

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“…Generally, the quality control of AWJM is done using performance indicators such as surface roughness Ra , cutting depth CD, Kerf width KW, Kerf angle KA, depth of striation free surface d and surface waviness Wa depending on the parameters of AWJM which are jet pressure P , standoff-distance SOD, abrasive flow rate AFR, the nature of the abrasive, the size of the abrasive grains, the traverse speed of the nozzle TS, the diameter of the nozzle, and the nozzle incidence angle and the mechanical properties of the marble (porosity, Shore hardness, Bohme surface abrasion resistance, uniaxial compressive strength (UCS) and density). 15–29…”

Section: Introductionmentioning

confidence: 99%

Linear regression and artificial neural network models for predicting abrasive water jet marble drilling quality

Hammouda

Ghienne

Dion

et al. 2022

Advances in Mechanical Engineering

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Marble is a fragile and heterogeneous material whose properties vary depending on the nature and origin of the marble. Therefore, the marble machining process requires the skills and know-how of the stone cutter to manually configure the machining parameters for each piece of marble. This study addresses the enhancement of quality achieved by marble drilling processes in the industry. The objective of this work is to drill marble with high quality performance and avoid fracturing the material. This article focuses on the process of drilling white Carrara marble with an abrasive water jet. This unconventional tool significantly reduces unwanted damage resulting from the drilling process (fractures, spalling) compared to the conventional drilling process (rotating abrasive tools). The effect of waterjet cutting parameters, namely jet pressure, stand-off distance, nozzle traverse speed, abrasive flow rate, and hole diameter on drilling tolerances is studied. Five defects in the drilling process are modeled in this work: surface roughness, hole circularity, hole cylindricity, hole location error, and hole taper, using analysis of variance of linear regression models and an artificial neural network width high accuracy. These models could be of great interest to stone cutters to configure marble machining parameters and improve marble manufacturing quality.

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A microscopic study on kerfs in rocks subjected to abrasive waterjet cutting

Cited by 15 publications

References 24 publications

Effect of initial temperature on cutting speed in liquid nitrogen assisted abrasive suspension jet machining of tungsten steel

Effect of initial temperature on cutting speed in liquid nitrogen assisted abrasive suspension jet machining of tungsten steel

Breaking mechanism and damage evolution rule of abrasive water jet impacting reinforced concrete

Linear regression and artificial neural network models for predicting abrasive water jet marble drilling quality

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