Articles via Databases
Articles via Journals
Online Catalog
E-books
Research & Information Literacy
Interlibrary loan
Theses & Dissertations
Collections
Policies
Services
About / Contact Us
Administration
Littman Architecture Library
This site will be removed in January 2019, please change your bookmarks.
This page will redirect to https://digitalcommons.njit.edu/dissertations/1150 in 5 seconds

The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Investigation of waterjet-workpiece interaction
Author: Li, Hung-Yuan
View Online: njit-etd1992-001
(xvi, 179 pages ~ 10.4 MB pdf)
Department: Department of Mechanical and Industrial Engineering
Degree: Doctor of Philosophy
Program: Mechanical Engineering
Document Type: Dissertation
Advisory Committee: Geskin, E. S. (Committee chair)
Sodhi, R. S. (Committee member)
Harnoy, Avraham (Committee member)
Levy, Nouri (Committee member)
Gordon, Eugene I. (Committee member)
Date: 1992-05
Keywords: Water jet cutting.
Availability: Unrestricted
Abstract:

The objective of this research is to develop new knowledge related to the fundamental physical phenomena of waterjet machining of ductile materials, and to use this knowledge to construct a numerical analysis model. The resulting knowledge will enable enhancement of waterjet cutting efficiency.

Experimental study of fundamental mechanisms and the acquisition of the data detailing micro and macro scale phenomena which occur during the machining process is carried out. It is shown that the material damage mechanism associated with waterjet machining is erosion cavitation which initiates ultrasonic stress wave propagation in the workpiece. Fatigue, an important element in producing material erosion, is enhanced by this high frequency stress and reduces the material endurance limit. Experimental results validate the existence of these stress waves. The frequency is 3 MHz in the case studies.

The acquired information is used to construct a detailed description of the phenomena using finite element numerical modeling and continuum damage mechanics. Numerical results are in good agreement with the experimental results.

The resulting models may be used to optimize the jet generation and jet workpiece interaction with particular focus on the improvement of nozzle design, integration of kinetic, chemical, and thermal energies for material shaping, and use of high speed percussive jets. With these new technologies and techniques, enhancement of material machining will be feasible.


If you have any questions please contact the ETD Team, libetd@njit.edu.

 
ETD Information
Digital Commons @ NJIT
Theses and DIssertations
ETD Policies & Procedures
ETD FAQ's
ETD home

Request a Scan
NDLTD

NJIT's ETD project was given an ACRL/NJ Technology Innovation Honorable Mention Award in spring 2003