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DYNAMICS OF WING CRACKS AND NANOSCALE DAMAGE IN SILICA GLASS
by
Zhen Lu
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
(MATERIAL SCIENCE)
December 2007
Copyright 2007 Zhen Lu
Object Description
| Title | Dynamics of wing cracks and nanoscale damage in silica glass |
| Author | Lu, Zhen |
| Author email | zhenl@usc.edu |
| Degree | Doctor of Philosophy |
| Document type | Dissertation |
| Degree program | Materials Science |
| School | Viterbi School of Engineering |
| Date defended/completed | 2007-08-27 |
| Date submitted | 2007 |
| Restricted until | Unrestricted |
| Date published | 2007-10-09 |
| Advisor (committee chair) | Kalia, Rajiv |
| Advisor (committee member) |
Vashishta, Priya Madhukar, Anupam Nakano, Aiichiro Mansfeld, Florian B. |
| Abstract | Multimillion atom molecular-dynamics (MD) simulations were performed to investigate dynamic fracture in silica glasses. Simulations identified the atomistic mechanisms for the nucleation, growth, and healing of wing cracks in a confined precracked glass. Under dynamic compression, frictional sliding of pre-crack surfaces nucleates nanovoids which evolve into nanocrack columns at the pre-crack tip. Nanocrack columns merge to form a wing crack, which grows via coalescence with nanovoids in the direction of maximum compression. The main growth mechanism of the wing crack is shown to be damage induced by the disorder intrinsic to the amorphous structure. Lateral confinement arrests the growth and partially heals the wing crack. Growth and arrest of the wing crack occur repeatedly, as observed in dynamic compression experiments on brittle solids under lateral confinement. |
| Keyword | cracks; silica; glass; fracture; simulation |
| 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-m854 |
| Rights | Lu, Zhen |
| 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-Lu-20071009 |
| Archival file | uscthesesreloadpub_Volume26/etd-Lu-20071009.pdf |
Description
| Title | Page 1 |
| Full text | DYNAMICS OF WING CRACKS AND NANOSCALE DAMAGE IN SILICA GLASS by Zhen Lu 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 (MATERIAL SCIENCE) December 2007 Copyright 2007 Zhen Lu |
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