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osu1308251828.pdf (14.61 MB)
ETD Abstract Container
Abstract Header
Molecular Dynamics Study of Crack Propagation Behavior and Mechanisms in Nickel
Author Info
Zhang, Jiaxi
Permalink:
http://rave.ohiolink.edu/etdc/view?acc_num=osu1308251828
Abstract Details
Year and Degree
2011, Master of Science, Ohio State University, Mechanical Engineering.
Abstract
How the microstructure of crystal affects the crack propagation process in ductile material is an important and open problem. Mechanisms, including emission of dislocations, nucleation of micro twin and creation of stacking faults, contribute to the plastic deformation near crack tip and affect the crack behavior. In this thesis, we developed a systematic approach to capture the evolvement of these mechanisms as well as the behavior of crack propagation at sub-micro level. We start from constructing a geometric based method in molecular dynamics (MD) to identify and quantify these deformation mechanisms. Then the parameters of mechanisms quantification obtained from MD simulation are connected with strain gradient plasticity theory, the size effect on dislocation density at crack tip are analyzed. Finally, we propose a method to calculate the plastic dissipation energy release rate.
Committee
Somnath Ghosh, Dr, (Advisor)
Daniel A. Mendelsohn, Dr, (Committee Member)
Pages
71 p.
Subject Headings
Mechanical Engineering
Keywords
molecular dynamics
;
ductile crack
;
dislocation
;
twin
;
energy release rate
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Citations
Zhang, J. (2011).
Molecular Dynamics Study of Crack Propagation Behavior and Mechanisms in Nickel
[Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308251828
APA Style (7th edition)
Zhang, Jiaxi.
Molecular Dynamics Study of Crack Propagation Behavior and Mechanisms in Nickel.
2011. Ohio State University, Master's thesis.
OhioLINK Electronic Theses and Dissertations Center
, http://rave.ohiolink.edu/etdc/view?acc_num=osu1308251828.
MLA Style (8th edition)
Zhang, Jiaxi. "Molecular Dynamics Study of Crack Propagation Behavior and Mechanisms in Nickel." Master's thesis, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308251828
Chicago Manual of Style (17th edition)
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Document number:
osu1308251828
Download Count:
2,734
Copyright Info
© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.