A numerical and experimental study of oblique impact of ultra-high pressure abrasive water jet

Abstract

An investigation of the abrasive water jet with an emphasis on the oblique impact of abrasive particles on the target plate is performed. Ultra-high jet pressure necessitates a close examination of the phenomena featured by small spatial and temporal scales. The effect of oblique impact is assessed from both numerical and practical aspects. Numerical simulation, implemented using the commercial code LS-DYNA, allows a detailed inspection of transient stress wave propagation inside the target plate. And impact experiments facilitate a qualitative description of resultant footprints of oblique water jet. Different incident angles of abrasive particles are adopted and a comparison is thereby unfolded. The results indicate that rebound, embedding, and penetration of single abrasive particle are three representative final operation states. Adjacent to the abrasive particle, the response of the target plate to oblique impact is reflected by von Mises stress distribution and plate deformation as well. Oblique impact arouses non-symmetrical stress wave distributions and distinct unbalanced node displacements at the two sides of the abrasive particle. As for the target plate, global surface morphology is in accordance with predicted effects. The most favorable surface roughness is not associated with vertical impact, and it hinges upon the selection of standoff distance. Furthermore, variation of surface roughness with incident angle is not monotonous.

Effects of the geometry of impinging surface on the pressure oscillations of self-resonating pulsed waterjet

“…[1][2][3] A number of industrial and practical applications have made high-speed waterjet a significantly important technology being focused by many researchers. These applications include materials cutting, rock breaking, coating removal, and surface cleaning.…”

“…As a novel and non-conventional machining method, high-speed waterjet is experiencing a rapid development during the last few decades. [1][2][3] A number of industrial and practical applications have made high-speed waterjet a significantly important technology being focused by many researchers. These applications include materials cutting, rock breaking, coating removal, and surface cleaning.…”

A new calculation formula to describe the dynamic pressure of water jet peening with elliptical nozzle for high-efficiency treatment

“…When the water jet vertically acts on the surface of the object, the impact pressure changes with the distance to the nozzle and spreads from the jet center to the surrounding. [23][24][25][26][27][28] Therefore, it is the scientific basis and key to establish an accurate calculation formula to describe the impact pressure distribution of the elliptical nozzle in order to realize the highefficiency treatment of high pressure water jet in engineering application. Song et al 29 studied the influence of the orifice flow geometry on the trajectory of the jet liquid column through experiments.…”

Numerical simulation study on erosion mechanism of pre-mixed abrasive water jet

“…The technology of AWJ has been studied by many domestic and foreign scholars. 7,8 The process, in which the material is impacted by the abrasive particles, was simulated numerically through finite element method (FEM) by Anwar et al 9 The erosion process of pure water jet was studied in numerical simulation by K Maniadaki et al 10 The impact process of water jet on plastic material was studied in numerical simulation by L Ma et al 11 The influence of different nozzle diameters and water pressure, abrasive flow rate, and process conditions on cutting depth was studied based on neural network by DS Srinivasu and Ramesh Babu. 12 The optimal incident velocity and incident angle of AWJ were obtained through numerical simulation by Junkar et al 13 and W Jinghua et al 14 Based on the smoothed particle hydrodynamics (SPH) and FEM algorithm, Mu Chaomin, RongLifan et al 15 simulated the water jet cut rock materials and determined the optimal AWJ cutting parameters.…”