Publication Date
2020
Document Type
Dissertation/Thesis
First Advisor
Salehinia, Iman
Degree Name
M.S. (Master of Science)
Legacy Department
Department of Mechanical Engineering
Abstract
The scratching behavior of a Nb/NbC ceramic-metal (cermet) nanolaminate is studied to investigate the tribological properties using molecular dynamics. Many atomistic studies have reviewed the tribological properties of nanolaminates but are limited to only either metal-metal or ceramic-ceramic nanolaminates. This study aims to address how varying parameters such as metal-ceramic thickness ratio, indenter size, and scratching depth affect the tribological properties of cermet nanolaminate under a scratching load. Furthermore, the underlying deformation mechanisms are explored. To study the effect of the metal-ceramic ratio on Nb/NbC nanolaminate, molecular dynamics simulations are performed on different models varying the metal-ceramic ratio. The number of pile-up atoms, normal load, scratching load, and friction coefficients are calculated. Results show the scratching behaviors of Nb/NbC multilayers are significantly affected by the metal-ceramic thickness ratio at shallow penetration depth. The atomic pile-up (material removal) is larger for lower metal-ceramic thickness ratio, and the scratching load is lowest for larger metal-ceramic thickness ratios, resulting in a lower friction coefficient. But the metal-ceramic thickness ratios have less effect on the tribological properties of cermet when the indenter size is increased as a larger plastic volume is formed in each layer. However, the frictional properties show the opposite behavior at a deeper penetration depth. The highest frictional properties have been reported for a lower metal-ceramic ratio because of a significant increase in the normal load.
Recommended Citation
Uddin, Md Mesbah, "Studying The Scratching Behavior of Nb/nbc Nanolaminate Using Molecular Dynamics atomistic Simulations" (2020). Graduate Research Theses & Dissertations. 7741.
https://huskiecommons.lib.niu.edu/allgraduate-thesesdissertations/7741
Extent
70 pages
Language
eng
Publisher
Northern Illinois University
Rights Statement
In Copyright
Rights Statement 2
NIU theses are protected by copyright. They may be viewed from Huskie Commons for any purpose, but reproduction or distribution in any format is prohibited without the written permission of the authors.
Media Type
Text
