Atomistic behavior of nanoporous carbon nanotube-aluminum composite under compressive loading

Suk, Myung Eun

doi:10.1088/2053-1591/ab6092

Cited by 7 publications

(6 citation statements)

References 41 publications

(65 reference statements)

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“…The MD results were in good agreement with the experimental results regarding the elastic constants, surface energies, migration energies, stacking fault energies, and vacancy formation [ 30 ]. Notably, the elastic modulus obtained from the MD was 61.43 GPa [ 13 ], which is in close agreement with the experimentally obtained elastic modulus of 60.2–69.5 GPa [ 31 , 32 ].…”

Section: Methodssupporting

confidence: 83%

“…From the stress field in the matrix phase, there exists an interphase region where the stress field around the CNT is higher [ 13 ]. Therefore, the rule of mixtures can be modified by introducing the Young’s modulus of the interphase region.…”

Section: Resultsmentioning

confidence: 99%

“…For the annular interphase geometry [ 13 ] embedded in square representative volume elements (RVE), the volume of the interphase region is as follows:

where

is the ratio of the thickness of the interphase area to the CNT radius,

. Therefore, the Young’s modulus of the matrix phase can be expressed as a function of the CNT volume fraction as follows:

where

is the CNT volume fraction, and

.…”

Section: Resultsmentioning

confidence: 99%

“…The compressive [ 13 , 14 ] and tensile behaviors [ 15 ] of CNT-Al have been studied using MD simulations. The increase in Young’s modulus was observed in accordance with the experimental study.…”

Section: Introductionmentioning

confidence: 99%

“…The Ni coating of CNT further increased the Young’s modulus of CNT-Al MMCs by improving the interfacial bonding between Al and CNT [ 16 ]. The effects of the temperature [ 17 ], CNT radius [ 15 ], and volumetric contents [ 13 ] on the mechanical properties were studied using MD simulations.…”

Section: Introductionmentioning

confidence: 99%

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Effect of the Nanotube Radius and the Volume Fraction on the Mechanical Properties of Carbon Nanotube-Reinforced Aluminum Metal Matrix Composites

Suk

2021

Molecules

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By using the advantages of carbon nanotubes (CNTs), such as their excellent mechanical properties and low density, CNT-reinforced metal matrix composites (MMCs) are expected to overcome the limitations of conventional metal materials, i.e., their high density and low ductility. To understand the behavior of composite materials, it is necessary to observe the behavior at the molecular level and to understand the effect of various factors, such as the radius and content of CNTs. Therefore, in this study, the effect of the CNT radius and content on the mechanical properties of CNT-Al composites was observed using a series of molecular dynamics simulations, particularly focusing on MMCs with a high CNT content and large CNT diameter. The mechanical properties, such as the strength and stiffness, were increased with an increasing CNT radius. As the CNT content increased, the strength and stiffness increased; however, the fracture strain was not affected. The behavior of double-walled carbon nanotubes (DWNTs) and single-walled carbon nanotubes (SWNTs) was compared through the decomposition of the stress–strain curve and observations of the atomic stress field. The fracture strain increased significantly for SWNT-Al as the tensile force was applied in the axial direction of the armchair CNTs. In the case of DWNTs, an early failure was initiated at the inner CNTs. In addition, the change in the elastic modulus according to the CNT content was predicted using the modified rule of mixture. This study is expected to be useful for the design and development of high-performance MMCs reinforced by CNTs.

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Section: Methodssupporting

confidence: 83%

Section: Resultsmentioning

confidence: 99%

“…For the annular interphase geometry [ 13 ] embedded in square representative volume elements (RVE), the volume of the interphase region is as follows:

where

is the ratio of the thickness of the interphase area to the CNT radius,

. Therefore, the Young’s modulus of the matrix phase can be expressed as a function of the CNT volume fraction as follows:

where

is the CNT volume fraction, and

.…”

Section: Resultsmentioning

confidence: 99%