This book is a collection of papers published by the author and his colleagues on waterjet technology while working at Flow Industries, Inc. and OMAX Corp., Washington DC, USA. It represents the author’s nearly 30 years of R&D experience and contribution in advancing waterjet/fluidjet technology.
Waterjet is an extremely complex flow phenomenon—a supersonic, turbulent, compressible, and three-phase flow involving fluid–fluid, fluid–solid, and solid–solid interactions in both confined (highly wearable) and unconfined environments. It spans from gravity-dominated flow to capillary-dominated microfluidics. Such complexity is beyond any analytic solution and numerical simulation. This book is a collection of papers published by the author and his colleagues on waterjet technology while working at Flow Industries, Inc. and OMAX Corp., Washington DC, USA. It represents the author’s nearly 30 years of R&D experience and contribution in advancing waterjet/fluidjet technology. The book comprises 32 chapters grouped in 10 topical parts. It presents physical experiments showcasing novel methods as R&D tools and uses high-resolution photographs and micrographs extensively to help visualize details of fine features such as surface roughness and edge qualities of machined parts. It demonstrates how quantified visualization records and sensor measurements can be applied for further in-depth investigation. The book highlights the development and commercialization of micro abrasive waterjet technology under the support of a two-phase National Science Foundation Small Business Innovative Research grant and the subsequent naming of the innovation as a finalist of the 2016 R&D 100 Awards and receiving the 2016 Tibbitts Award from the U.S. Small Business Administration.
Part 1
1. Measurements of Water-Droplets and Abrasive Speeds in an Ultrahigh-Pressure Waterjets and Abrasive-Waterjets
2. Near-Net Shaping of Optical Surfaces with UHP Abrasive Suspension Jets
3. Evaluation of Nozzle Health States for AWJ Machining
4. A Vanishing Abrasive Cryogenic Jet for Airframe Depainting
5. Enhancement of Ultrahigh-Pressure Technology with LN2 Cryogenic Jets Part 2 6. CFD and Physical Modeling of UHP AWJ Drilling
7. Hole Drilling with Abrasive Fluidjets Part 3 8. Collateral Damage by Stagnation Pressure Buildup during Abrasive-Fluidjet Piercing
9. Machining Honeycomb Composites with Abrasive-Waterjets
10. Piercing in Delicate Materials with Abrasive-Waterjets
11. Applications of Abrasive-Fluidjets for Precision Machining of Composites Part 4 12. Waterjet Technology for Machining Fine Features Pertaining to Micromachining
13. Micro Abrasive-Waterjet Technology
14. Novel Processes for Improving Precision of Abrasive Waterjet Machining
15. Versatile Micro Abrasive Waterjet Technology for Machining Nanomaterials Part 5 16. Roles of Abrasives in AWJ Meso-Micro Machining
17. Roles of Taper Compensation in AWJ Ultra-Precision Machining
18. Precision Machining of Advanced Materials with Waterjets Part 6 19. Application of Abrasive-Waterjet for 3D Machining
20. Advanced Waterjet Technology for Machining Curved and Layered Structures
21. Advanced Abrasive Waterjet for Multimode Machining Part 7 22. Abrasive-Waterjet Technology for Biomedical Applications
23. Low-Cost Manufacturing of Flow Channels with Multi-Nozzle Abrasive-Waterjets: A Feasibility Investigation
24. Applications of Abrasive-Waterjets for Machining Fatigue-Critical Aerospace Aluminum Parts
25. Fatigue Performance Enhancement of AWJ-Machined Aircraft Aluminum with Dry-Grit Blasting
26. Machining of Aircraft Titanium with Abrasive-Waterjets for Fatigue Critical Applications Part 8 27. Economic and Technical Efficiency of High Performance Abrasive Waterjet Cutting
28. "7M" Advantage of Abrasive Waterjet for Machining Advanced Materials Part 9 29. Performance Comparison on Meso-Micro Machining of Waterjet, Lasers, EDM, and CNC Milling
30. Performance Comparison of Subtractive and Additive Machine Tools for Meso-Micro Machining Part 10 31. Review of Accomplishments in Abrasive-Waterjet Technology from Macro to Micro Machining: Part 1
32. Review of Accomplishments in Abrasive-Waterjet Technology from Macro to Micro Machining: Part 2
Peter H.-T. Liu earned his doctorate from Colorado State University, USA, in 1972 and boasts a distinguished 50-year career in experimental fluid dynamics and waterjet technology. He joined Flow Research/Flow Industries, Inc. in 1973 and spearheaded his R&D efforts in experimental fluid dynamics, focusing on qualitative and quantitative flow visualization for both laboratory and field investigations. Research topics spanned from naval hydrodynamics, turbulence in homogeneous and stratified fluids, transport of pollution in complex terrain, to wake studies of wind turbines and aircraft. Under the mentorship of Dr John H. Olsen, he transitioned his research focus in 1995 to waterjet technology, leading to significant advancements and successful commercialization in waterjet micromachining. Dr Lius extensive experience uniquely prepared him to tackle waterjet challenges, fostering collaborations with universities and research institutes, resulting in his numerous publications. Despite retiring from OMAX/Hypertherm in March 2022, he continues his R&D endeavors, currently focusing on precision micromachining, and is working on a second book detailing the history of waterjets.
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