scholarly journals Effect of Garnet Characteristics on Abrasive Waterjet Cutting of Hard Granite Rock

2019 ◽  
Vol 2019 ◽  
pp. 1-12 ◽  
Author(s):  
Tae-Min Oh ◽  
Gun-Wook Joo ◽  
Yohan Cha ◽  
Gye-Chun Cho
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Rock Cutting ◽  
Cutting Performance ◽  
Abrasive Waterjet ◽  
Test Results ◽  
Abrasive Particles ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting

Abrasive waterjet cutting technology has come back into use in the field of rock excavation (such as for tunneling) due to the need for precision construction with low vibration. Because the abrasive particles play an important role in efficient erosion during the cutting process, the abrasive characteristics strongly affect the rock cutting performance. In this study, rock cutting tests were performed with five different coarse (40 mesh) garnets to explore the effect of the abrasive feed rate, physical properties, and particle size distribution on rock cutting performance. In addition, garnet particle disintegration was investigated with garnet characteristics for the abrasive waterjet. The test results indicate that the particle size distribution, garnet purity, specific gravity, and hardness are the most important parameters for rock cutting performance. This study offers better understanding of coarse garnet performance and efficiency according to the garnet characteristics. This should provide assistance in selection of the garnet needed to achieve the desired performance for hard rock cutting.

Factors Influencing the Particle Size Distribution in an Abrasive Waterjet

1991 ◽  
Vol 113 (4) ◽  
pp. 402-411 ◽  
Author(s):  
T. J. Labus ◽  
K. F. Neusen ◽  
D. G. Alberts ◽  
T. J. Gores
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Cutting Speed ◽  
Target Material ◽  
Abrasive Waterjet ◽  
Sieve Analysis ◽  
Size Distributions ◽  
Mixing Process ◽  
Jet Mixing

A basic investigation of the factors which influence the abrasive jet mixing process was conducted. Particle size analysis was performed on abrasive samples for the “as-received” condition, at the exit of the mixing tube, and after cutting a target material. Grit size distributions were obtained through sieve analysis for both water and air collectors. Two different mixing chamber geometries were evaluated, as well as the effects of pressure, abrasive feed rate, cutting speed, and target material properties on particle size distributions. An analysis of the particle size distribution shows that the main particle breakdown is from 180 microns directly to 63 microns or less, for a nominal 80 grit garnet. This selective breakdown occurs during the cutting process, but not during the mixing process.

Influence of particle size distribution, test time, and moisture content on sandy stratum LCPC abrasivity test results

2020 ◽  
Vol 80 (1) ◽  
pp. 611-625 ◽  
Author(s):  
Zhengyang Sun ◽  
Zhiyong Yang ◽  
Yusheng Jiang ◽  
Hongji Gao ◽  
Kuanda Fang ◽  
...  
Keyword(s):  
Particle Size ◽  
Moisture Content ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Test Time ◽  
Test Results

scholarly journals Experimental Investigation into Internal Erosion Potential for Granular Filters

2016 ◽  
Author(s):  
Jahanzaib Israr ◽  
Buddhima Indraratna ◽  
Cholachat Rujikiatkamjorn
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Relative Density ◽  
Size Distribution ◽  
Large Body ◽  
Internal Erosion ◽  
Published Data ◽  
Test Results ◽  
Wide Range ◽  
Partial Success

Internal erosion is a phenomenon whereby the filtrates under the influence of significant seepage forces accompany the finer fraction from potential internally unstable filters (e.g. broadly- and gap-graded soil), occasionally rendering them ineffective. The filter assessment for internal erosion or instability potential is emphasized through particle size distribution based geometrical criteria ignoring the effect of compaction. In this study, the results of hydraulic gradient controlled internal erosion tests conducted over a wide range of compacted sand-gravel mixtures were used to analyse some of the available geometrical criteria, which interestingly showed partial success in assessing the filter’s internal erosion potential. It was revealed that the occurrence of internal erosion is a combined function of particle size distribution and the relative density of soils that had been ignored in many of the existing criteria. A comparison between the assessments obtained from some of the particle size based criteria and that from a constriction size based technique was reported for a large body of published data. It was observed that the latter criterion, which incorporates the effects of both particle size distribution and relative density of soils in tandem, could assess the reported test results with higher accuracy.

scholarly journals Reuse of abrasive particles in abrasive waterjet cutting

Mechanik ◽  
2017 ◽  
Vol 90 (1) ◽  
pp. 62-63
Author(s):  
Daniel Krajcarz ◽  
Sławomir Spadło
Keyword(s):  
Aluminium Alloy ◽  
Surface Quality ◽  
Geometrical Structure ◽  
Abrasive Waterjet ◽  
Experimental Investigations ◽  
Abrasive Particles ◽  
Waterjet Cutting ◽  
Abrasive Grains ◽  
Abrasive Waterjet Cutting ◽  
Cutting Surface

Presented is the possibility of reuse abrasive grains in abrasive waterjet cutting. The disintegration particles of garnet # 80 used to create a new abrasive garnet, corresponding to the fresh garnet # 120. In order to determine the ability of cutting recycling abrasive grains was carried out the aluminium alloy cutiing by using fresh and recycling garnet # 120. The experimental investigations of cutting surface quality focused on evaluation of surface geometrical structure.

scholarly journals Modeling Method and Experimental Study on the Random Distribution of Abrasive Particles in the Jet Cutting Process

2021 ◽  
Author(s):  
Long Feng ◽  
Qiang Zhang ◽  
MingChao Du ◽  
Chunyong Fan ◽  
Kun Zhang
Keyword(s):  
Random Distribution ◽  
Numerical Models ◽  
Abrasive Waterjet ◽  
Sph Method ◽  
Abrasive Particles ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting ◽  
Simulation Results ◽  
Cutting Processes ◽  
The Impact

Abstract The distribution of abrasive particles in fluids is an important research topic in the study of abrasive waterjet cutting processes. However, it is impossible to obtain the accurate distribution law and influencing factors by performing only experiments; therefore, it is necessary to study abrasive waterjet cutting processes with the help of numerical models. The existing numerical models usually adopt the form of artificial settings for the distribution of abrasive particles in fluid. This method cannot accurately simulate the random distribution of particles. In this paper, the random algorithm method is used to simulate the impact azimuth and the random distribution of abrasive particles in water. The smoothed particle hydrodynamics (SPH) method is used to simulate the distribution of abrasive particles and the process of jet impingement. The influence of the particle distribution on the simulation results is studied. Comparisons show that the dent formed by the jet impinging on the target with random abrasive particles is similar to the dent from the actual cut, and the contour distribution of the dent is more uniform than that of the cut. The simulation results obtained by the SPH method are accurate.

A Comparative Study on the Basic Properties of FGD Gypsums

2011 ◽  
Vol 374-377 ◽  
pp. 1758-1763
Author(s):  
Ye Zhang ◽  
Peng Xuan Duan ◽  
Bao Sheng Jia ◽  
Fan Zhang
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Comparative Study ◽  
Size Distribution ◽  
Chemical Constituents ◽  
Test Results ◽  
Fgd Gypsum ◽  
Basic Properties

Compared with natural gypsum, the basic properties of FGD gypsum are studied based on the test results and then the influence of FGD gypsum’s chemical constituents, impurities and particle size distribution on its products is analyzed. The results indicate the impurities play an important role on the FGD gypsum behavior. Finally, the differences between FGD gypsum and natural gypsum are summarized.

A Focused Review on Enhancing the Abrasive Waterjet Cutting Performance by Using Controlled Nozzle Oscillation

2009 ◽  
Vol 404 ◽  
pp. 33-44 ◽  
Author(s):  
Jun Wang
Keyword(s):  
Process Parameters ◽  
Cutting Performance ◽  
Abrasive Waterjet ◽  
Depth Of Cut ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting ◽  
Engineering Materials ◽  
Awj Cutting ◽  
Cutting Modes ◽  
Selection Of

Increasing the performance of the abrasive waterjet (AWJ) cutting technology for engineering materials is the ultimate aim of research in this field. This paper presents a review on the studies using a controlled nozzle oscillation technique to increase the cutting performance of the AWJ cutting technology and the associated mechanisms primarily based on the work in the author’s laboratory. Primary attention is paid to the discussions of the depth of cut, the effect and selection of process parameters and the advantages by using this technique in both single- and multi-pass cutting modes.

scholarly journals Study On Abrasive Particle Impact Modeling And Cutting Mechanism

2021 ◽  
Author(s):  
Long Feng ◽  
Qiang Zhang ◽  
Mingchao Du ◽  
Wanshun Zang ◽  
Haixia Wang
Keyword(s):  
Numerical Model ◽  
Abrasive Particle ◽  
Local Deformation ◽  
Rigid Bodies ◽  
Abrasive Waterjet ◽  
Particle Impact ◽  
Abrasive Particles ◽  
Waterjet Cutting ◽  
Abrasive Waterjet Cutting ◽  
The Impact

Abstract Abrasive particles play a vital role in the impact on materials during abrasive waterjet cutting. To study the effect of particles on the cutting performance during abrasive waterjet cutting, the mostly irregular shape of the abrasive particles in the actual cutting process needs to be considered. In this paper, the particles are simplified as angular and circular particles. The method of Smoothed Particle Hydrodynamics (SPH) is used to simulate the process of particle impact targeting in abrasive jet cutting. Because the abrasive particle impact causes a large local deformation or removal of the surface of the target material, the traditional grid-based numerical method is not suitable for such problems; thus, the SPH method, which is suitable for the impact problem, is selected to establish the numerical model and solve it. In this paper, the fracture process of abrasive particles with different shapes of impact ductility and brittle target materials is studied by a numerical model. In the modeling process, abrasive particles are modeled as rigid bodies with material properties, the ductile materials is an aluminum alloy, the brittle material is quartz glass, which are simulated by changing the initial input conditions and particle shape, and the model is verified by experiments. The results show that the model successfully reproduces the collision process of particles during abrasive jet cutting, including the deformation mechanisms of plowing, fracture and crushing of the target.

scholarly journals Performance and Reuse of Steel Shot in Abrasive Waterjet Cutting of Granite

2021 ◽  
Author(s):  
Yohan Cha ◽  
Tae-Min Oh ◽  
Gun-Wook Joo ◽  
Gye-Chun Cho
Keyword(s):  
Particle Size ◽  
Industrial Waste ◽  
High Hardness ◽  
Rock Cutting ◽  
Cutting Performance ◽  
Abrasive Waterjet ◽  
Steel Shot ◽  
Abrasive Surface ◽  
The Cost ◽  
Recycled Steel

AbstractSteel shots are suitable for abrasive waterjet rock cutting and recycling because of the high hardness and magnetic properties of steel. This study evaluated the rock-cutting performance and recycling characteristics of steel shot waterjet. The rock-cutting responses of steel shot and garnet were compared at the same waterjet conditions. The used steel shot was collected and the particle-size changes were evaluated before reuse, and its cutting performance was re-evaluated. Overall, the steel shot waterjet yielded improvements in performance in the range of 30–50% compared with the garnet waterjet. Moreover, the recycled steel shot yielded a 50% reduction in cutting performance. Rust was observed on the surface of the used steel shot, the used steel shots were partially destroyed, and the debris on the abrasive surface needed to be removed by drying. The reusable steel shot left on the 80th sieve converged to 60% in each recycling run. The results of this study can be used to reduce the cost of abrasive waterjet and industrial waste.

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