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Research Papers: Design and Analysis

Energy Based Modeling of Ultra High-Pressure Waterjet Surface Preparation Processes

[+] Author and Article Information
A. Chillman, M. Ramulu

 Department of Mechanical Engineering,University of Washington, Seattle, WA 98195

M. Hashish

 Flow International Corporation, Kent, WA 98032

J. Pressure Vessel Technol 133(6), 061205 (Oct 19, 2011) (6 pages) doi:10.1115/1.4004566 History: Received May 11, 2010; Accepted June 01, 2011; Published October 19, 2011; Online October 19, 2011

Ultra high-pressure waterjets (UHP-WJ) have been emerging as a viable method for surface texturing, cleaning, and peening of metallic materials. Previous experimental studies have suggested that removal of material can be related to the energy density of the waterjet impinging upon the workpiece, rather than the net energy. The net energy transferred to the workpiece is a function of four key process parameters, namely, (i) orifice diameter, (ii) orifice geometry, (iii) supply pressure, and (iv) traverse rate. The energy density also incorporates jet spreading as well as flow rate and impulse pressure distributions within the waterjet. In this paper, a novel representation of the power distribution within the waterjet is presented, as well as a relationship governing jet-material interaction. Empirical validation on a Ti-6Al-4V titanium alloy is presented, with good correlation noted between the predicted and experimental results.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Cross-sectional evaluation of Ti-6Al-4V sample using PS  = 600 MPa, u = 90 mm/s, and a 0.249 mm orifice highlighting surface upheaval

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Figure 2

Cross-sectional evaluation of Ti-6Al-4V sample using PS  = 600 MPa, u = 30 mm/s, and a 0.249 mm orifice highlighting side-jetting induced lateral microcracking

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Figure 3

(a) Optical view of a 600 MPa waterjet in air and (b) zones of the waterjet

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Figure 4

Pressure and flow distributions in the transition zone of a free standing waterjet

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Figure 5

Cross-sectional depiction of jet defining areas of interest

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Figure 6

Distributions of (a) impact pressure [13-14], (b) flow rate per unit area [13-14], and (c) power density within the jet for the transition zone

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Figure 7

Waterjet processing track highlighting centerline of kerf

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Figure 8

Normalized waterjet power density as a function of normalized radial position

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Figure 9

Centerline depth as a function of energy density for Ti-6Al-4V material

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Figure 10

Measured versus Predicted centerline depth for Ti-6Al-4V material

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