Manufacturing Science

1

UNIVERSITY OF WASHINGTON COLLEGE of ENGINEERING
Department of Mechanical Engineering
Manufacturing Science Technology Laboratory
ADVANCED MATERIALS PROCESSING ULTRA HIGH
PRESSURE WATERJET APPLICATIONS
PI Professor M. Ramulu, Graduate Students Alex
Chillman, Inkwon Hwang
Abrasive Waterjet Cutting
Waterjet Surface Preparation

• Areas of focus
• Abrasive waterjet machining of
• metallic materials
• AWJ Machining of Composites
• Jet dynamics
• Abrasive waterjet process parameters
• Jet / Material Interactions

• Areas of focus
• Investigations of Surface Preparation Processes
  with waterjets at
• pressures up to 600 Mpa
• Jet / Material Interactions
• Inter-relationship between Waterjet Peening,
  Material Removal,
• and Surface Texturing during waterjet surface
  preparation process.
• Effects of Nozzle geometries
• Coating / Material Removal

Inputs (Jet / Material Properties)
8 Passes Each 125 Passes
125 Passes
Material Analysis of Titanium Alloy Ti-6Al-4V
Exposed to Elevated Temperatures
Abrasive Waterjet Cutting Effects on the Fiber
Matrix Interface in Carbon Composites
µm
Surface Profile
Surface Texturing
surface area at height
Surface Characteristics
Sub-surface Modifications
A 10 mm/s increase in nozzle traverse rate led to
a far smoother surface.
Profile Height Distribution varies drastically
for case of 21.2 mm/s
Abrasive Waterjet Drilling Effects
Sub-surface modifications / material hardening
are taking place due to jet impact.
SEM images show erosion occurs in pockets at
traverse rates above 31.7 mm/s