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Analysis of geometrical characteristics of CNT-Al composite using molecular dynamics and the modified rule of mixture (MROM)

Title
Analysis of geometrical characteristics of CNT-Al composite using molecular dynamics and the modified rule of mixture (MROM)
Other Titles
분자동역학 시뮬레이션을 이용한 탄소나노튜브 보강 알루미늄 복합재의 기계공학적 특성 분석
Author
Park, Dong Mun
Alternative Author(s)
박동문
Advisor(s)
윤길호
Issue Date
2019-02
Publisher
한양대학교
Degree
Master
Abstract
This research presents Molecular Dynamics (MD) simulations to characterize the tensile behaviors of aluminum (Al) composites reinforced with carbon nanotubes (CNTs). The positions, alignments and condensations of CNT inside aluminum composites are stochastic in real and they influence the tensile behaviors of the composites. Thus, it is important to quantize the strengths of the CNT-Al composites depending on the configurations of CNTs. For this, the angles of the CNTs are varied inside an aluminum composite to estimate the yield strengths of the composites using MD simulation. Compared with the strength of pure Al composite, the Young’s modulus of an aluminum composite increases about 20 GPa from 71.52 GPa to 92 GPa (Chiral vector (6,6), 0 degrees). However, with inclined carbon nanotubes, the strength is deteriorated due to the interface slip and the necking of Al block. Some deteriorations of yield stress and yield strain are observed due to premature failure of the CNT–Al composite due to local buckling. In addition, the longitudinal modulus of elasticity was simulated by the number of CNT walls and angle, and as a result, the elastic modulus increased as the number of walls of the nanotube increased, and the material properties of the CNT-Al composite became brittle. We also find out that the modified rule of mixture (MROM) can be used to characterize the effect of geometrical characteristics of SWCNT (Single Wall Carbon Nano Tube)-Al composite.
URI
https://repository.hanyang.ac.kr/handle/20.500.11754/99469http://hanyang.dcollection.net/common/orgView/200000434342
Appears in Collections:
GRADUATE SCHOOL[S](대학원) > MECHANICAL CONVERGENCE ENGINEERING(융합기계공학과) > Theses (Master)
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