Abstract
It has been found that the impact performance of water jets can be changed by its properties, which include pressure, additive, and mode of jet. Thus, an abrasive water jet (AWJ) has been developed as a new method. However, there is little research on the effect of abrasive concentration on the impact performance of abrasive jets. Thus, the SPH method is used to establish an abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities. The results indicate that there is little effect of the abrasive concentration on the peak impact force under different compressive strengths and abrasive densities, while the mean impact force tends to increase linearly with the abrasive concentration. The internal energy of the concrete increases stepwise with the abrasive concentration under different compressive strengths and abrasive densities. The concentration of 10%∼20% is the rapid increasing stage. The crushing depth and damage efficiencies are all maximum at a concentration of 20% under different compressive strengths and abrasive densities. After the concrete was impacted by the water from the water jet, it is divided into rebounding particles and intrusive particles. The more the intrusive particles, the easier the concrete to be crushed and damaged.
Highlights
Water jet technology has been widely applied in machinery, civil construction, gas drainage, and cleaning operations, especially in mining and petroleum drilling [1]
For the study of the smooth particle hydrodynamics (SPH) method, most scholars have neglected the study of the interaction and distribution between water and abrasive particles after crushing. erefore, in this paper, the SPH method was used to establish the abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities
E water jet and abrasive were first established by a set of SPH particles. en, by extracting the series of SPH particle numbers, the established SPH particles were divided into a water particle group and an abrasive particle group according to the ratio of the abrasive to the water, and the abrasive particle group was randomly distributed in the water particle group, as shown in Figure 2. e set of SPH particles is shown in box, and the length is 12 mm. e width of the water jet is 1.2 mm. e velocity of the water jet is 280 m/s
Summary
Water jet technology has been widely applied in machinery, civil construction, gas drainage, and cleaning operations, especially in mining and petroleum drilling [1]. Domestic and foreign researchers have used this technology to conduct many numerical simulations on the process of abrasive water jet cutting and crushing materials. At is to say, the target material cannot be included in the established simulation model, and the impact performance of the abrasive jet cannot be studied. The splash process after water impacted the material and the discrete properties of the abrasive particles cannot be simulated To this end, researchers have begun to use the smooth particle hydrodynamics (SPH) method to simulate abrasive jets. Erefore, in this paper, the SPH method was used to establish the abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities For the study of the SPH method, most scholars have neglected the study of the interaction and distribution between water and abrasive particles after crushing. erefore, in this paper, the SPH method was used to establish the abrasive water jet crushing concrete model to study the effect of abrasive concentration on the impact force, concrete internal energy, abrasive particle distribution, crushing depth, and damage and crushing efficiencies under different concrete compressive strengths and abrasive densities
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