Experimental Mechanics

, Volume 28, Issue 2, pp 159–169

Visualization of the abrasive-waterjet cutting process

  • Mohamed Hashish
Article
  • 471 Downloads

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

dj

jet diameter

dm

mixing-tube diameter

dn

waterjet-orifice diameter

f

camera speed in frames per second

h

depth of cut

\(\dot h\)

penetration rate

hc

depth of cut due to cutting wear

hd

depth of cut due to deformation wear

hf

depth of uncut portion due to jet deflection at the exit

\(\dot m\)

particle-mass-flow rate

N

number of passes

nf

number of frames over which depthh is achieved

P

waterjet pressure

Pc

critical threshold pressure

t

time

u

traverse rate

Xo

entry length after which jet reaches maximum depth

θc

angle between jet-velocity vector and traversevelocity vector

θe

jet-deflection angle at entry edge

θf

interface angle at depthhf

θo

initial angle of jet-solid interface

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References

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Copyright information

© Society for Experimental Mechanics, Inc. 1988

Authors and Affiliations

  • Mohamed Hashish
    • 1
  1. 1.Flow Research, Inc.Kent

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