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ANALYSIS OF THE EXISTENCE OF LONG RANGE INTERNAL STRESSES IN
DEFORMED METALS
by
Michael Adam Delos-Reyes
A Dissertation Presented to the
FACULTY OF THE GRADUATE SCHOOL
UNIVERSITY OF SOUTHERN CALIFORNIA
In Partial Fulfillment of the
Requirements for the Degree
DOCTOR OF PHILOSOPHY
(MECHANICAL ENGINEERING)
August 2008
Copyright 2008 Michael Adam Delos-Reyes
Object Description
| Title | Analysis of the existence of long range internal stresses in deformed metals |
| Author | Delos-Reyes, Michael Adam |
| Author email | delosrm@aol.com |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Mechanical Engineering |
| School | Viterbi School of Engineering |
| Date defended/completed | 2008-05-01 |
| Date submitted | 2008 |
| Restricted until | Unrestricted |
| Date published | 2008-06-24 |
| Advisor (committee chair) | Kassner, Michael |
| Advisor (committee member) |
Dravinski, Marijan Nutt, Steve |
| Abstract | This thesis examines the existence of long range internal stresses (LRIS) in deformed metal single crystals. Asymmetry in strain broadened x-ray diffraction (XRD) line profiles is often given as evidence of the existence of LRIS. It is found that experimental evidence in the literature is unable to definitively separate whether measured asymmetry is due to LRIS or due to diffraction effects independent of LRIS. Single crystals of copper were monotonically deformed in order to produce representative samples with asymmetry. Synchrotron experiments were performed using differential aperture x-ray microscopy (DAXM) to make spatially resolved measurements of elastic strains within individual dislocation cells for the very first time. Broad distributions of elastic strains were found, and the relative strains between cell walls and cell interiors are in agreement with the existence of LRIS. Simulations of XRD found asymmetry due to dislocation dipoles and due to stacking faults. The configuration of defects is found to be important. These simulation results, using realistic dislocation densities, suggest that asymmetry in real materials is possible in cases where LRIS is absent. |
| Keyword | x-ray; long range internal stress; synchrotron; asymmetry |
| Language | English |
| Part of collection | University of Southern California dissertations and theses |
| Publisher (of the original version) | University of Southern California |
| Place of publication (of the original version) | Los Angeles, California |
| Publisher (of the digital version) | University of Southern California. Libraries |
| Type | texts |
| Legacy record ID | usctheses-m1289 |
| Rights | Delos-Reyes, Michael Adam |
| Repository name | Libraries, University of Southern California |
| Repository address | Los Angeles, California |
| Repository email | http://www.usc.edu/isd/libraries/services/ask_a_librarian/email/ |
| Filename | etd-DelosReyes-20080624 |
| Archival file | uscthesesreloadpub_Volume44/etd-DelosReyes-20080624.pdf |
Description
| Title | Page 1 |
| Full text | ANALYSIS OF THE EXISTENCE OF LONG RANGE INTERNAL STRESSES IN DEFORMED METALS by Michael Adam Delos-Reyes A Dissertation Presented to the FACULTY OF THE GRADUATE SCHOOL UNIVERSITY OF SOUTHERN CALIFORNIA In Partial Fulfillment of the Requirements for the Degree DOCTOR OF PHILOSOPHY (MECHANICAL ENGINEERING) August 2008 Copyright 2008 Michael Adam Delos-Reyes |
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