Experimental Mechanics

, Volume 28, Issue 2, pp 159–169

Visualization of the abrasive-waterjet cutting process

Authors

  • Mohamed Hashish
    • Flow Research, Inc.
Article

DOI: 10.1007/BF02317567

Cite this article as:
Hashish, M. Experimental Mechanics (1988) 28: 159. doi:10.1007/BF02317567

Abstract

Cutting with abrasive waterjets was visualized in three types of materials: Lexan, Lucite and glass. Movie cameras were used at speeds of 64 and 1000 frames/s to record sequences of the jet penetration in these materials. It was found that the cutting process consists of two basic modes of erosion. The first, known as the cutting-wear mode, occurs at relatively shallow angles of impact. This mode results in a steady-state jet-solid interface. The other mode, the deformation-wear mode, occurs at large angles of impact and results in an unsteady penetration zone. The relative contribution of each of these two modes or mechanisms to material removal depends on the process parameters. The cutting process is cyclic in nature when the deformation-wear mechanism is partially or totally contributing to cutting. Qualitative and quantitative results of these visualization experiments suggest a mechanistic model for the penetration process. The results of this work may also be expanded to explain other ‘stream-like’ cutting-tool processes, such as laser and flame cutting.

List of Symbols

d j

jet diameter

d m

mixing-tube diameter

d n

waterjet-orifice diameter

f

camera speed in frames per second

h

depth of cut

\(\dot h\)

penetration rate

h c

depth of cut due to cutting wear

h d

depth of cut due to deformation wear

h f

depth of uncut portion due to jet deflection at the exit

\(\dot m\)

particle-mass-flow rate

N

number of passes

n f

number of frames over which depthh is achieved

P

waterjet pressure

P c

critical threshold pressure

t

time

u

traverse rate

X o

entry length after which jet reaches maximum depth

θ c

angle between jet-velocity vector and traversevelocity vector

θ e

jet-deflection angle at entry edge

θ f

interface angle at depthh f

θ o

initial angle of jet-solid interface

Copyright information

© Society for Experimental Mechanics, Inc. 1988