Advanced nanoindentation simulations for carbon nanotube reinforced nanocomposites

Ahmed, Khondaker Sakil; Ibrahim, Ibriju; Keng, Ang Kok

doi:10.1016/j.heliyon.2020.e04575

Cited by 7 publications

(8 citation statements)

References 59 publications

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“…It may be due to buckling of SWCNT during the loading phase because of high diameter to thickness ratio of the tubes. 75 The figure also shows that the curve for CNT thickness 0.068 nm is very close to that of the pure Aluminium one. Here the maximum contact force at an interference of 0.78 nm is 0.0161 mN which is nearly same as that obtained for pure Al (0.0159 mN).…”

Section: Fe Analysis Resultssupporting

confidence: 61%

“…The objective of this section is to graphically present the validation of the present method by comparing numerical results (contact force vs indentation depth) produced by the present method against results published in established literature. 75,77 Two different comparisons are performed for the present model – the first one compares the contact force versus interference plot in case of loading and unloading of an Aluminium block by a sharp tip, 75 while the second one compares the results of an indentation analysis performed on a CNT-based nanocomposite. 75 Appropriate adjustments are made to the present model in order to make it equivalent to the systems analysed in the two above-mentioned papers.…”

Section: Resultsmentioning

confidence: 99%

“…75 Appropriate adjustments are made to the present model in order to make it equivalent to the systems analysed in the two above-mentioned papers. 75,77…”

Section: Resultsmentioning

confidence: 99%

“…On the other hand, the nodes placed on the x -axis are restricted from moving in the vertical direction ( y -direction). 75 The von Mises yield criterion is adopted to determine the onset of post-elastic behaviour, which is modelled as bilinear isotropic hardening. Initially, the indenter is moved towards the nanocomposite substrate up to an indentation depth of 0.78 nm then slowly withdrawn from the substrate.…”

Section: Finite Element Modelmentioning

confidence: 99%

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Finite element based indentation contact analysis of SWCNT nano-composite

Bhadra

Jana

Mitra

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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The focus of the present study is to simulate the indentation type contact behaviour of single walled carbon nanotube (SWCNT) based nanocomposite. The contact system consists of a deformable Aluminium matrix, reinforced with a group of SWCNTs, and a conical indenter which is assumed as rigid. Downward and upward displacement is imparted on the conical indenter in order to simulate the loading and unloading phases of the contact. The model has been developed using APDL code on the ANSYS platform. Adequacy and validity of the model has been established by comparison with results from already published papers available in literature and the matching between the two sets of results is found to be excellent. In terms of results, contact forces, contact area, contact pressure and deformation behaviour are extracted from the analysis with varying wall thickness of CNTs. Detailed analysis of the obtained results has been carried out and it is found that sink in and pile up (in one particular scenario) behaviour is exhibited. It is also found that due to high deformation of the tubes at high indentation depth, there is material flow towards the axis of symmetry and creation of small elastic zones in the matrix material.

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Section: Fe Analysis Resultssupporting

confidence: 61%

Section: Resultsmentioning

confidence: 99%

“…75 Appropriate adjustments are made to the present model in order to make it equivalent to the systems analysed in the two above-mentioned papers. 75,77…”

Section: Resultsmentioning

confidence: 99%

Section: Finite Element Modelmentioning

confidence: 99%

See 2 more Smart Citations

Finite element based indentation contact analysis of SWCNT nano-composite

Bhadra

Jana

Mitra

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Numerical simulation studies of the mechanical properties of carbon nanotubes (CNTs) [1][2][3][4][5][6][7][8][9][10][11] and nanocomposites reinforced with CNTs [12][13][14][15][16][17][18] have attracted significant attention from the research community. Due to the extraordinary properties of CNTs [19][20][21][22][23][24][25][26], such as high stiffness, high strength, high thermal conductivity and low weight, they have a significant number of potential applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Morphology and Structure of MWCNTs on Metal Matrix Nanocomposites

Carneiro

Simões

2020

Materials

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The effect of using different carbon nanotubes (CNTs) on the production of nanocomposites was evaluated in this work. The investigated CNTs were multi-walled carbon nanotubes (MWCNTs) with different morphologies and structures. The main objective was to relate the results reported by numerical simulation with the results obtained experimentally in order to validate these methodologies. A detailed characterization of CNTs was carried out to establish the different main characteristics, such as inner and outer diameters, defects, structure and the number of walls. Metal matrix nanocomposites were produced using the powder metallurgy route. The experimental results show that the morphology and structure of MWCNTs have a significant effect on the dispersion process for nanocomposite production. Straight CNTs with a larger diameter and with few defects allow for the production of nanocomposites with uniform dispersion and strong interface bonding, leading to a higher hardness value. In addition, the CNT introduction into a metal matrix induces a change in the deformation behavior that plays an important role in the strengthening mechanisms. Although some aspects are not considered in the molecular dynamic (MD) simulation, such as the CNT random orientation and CNT agglomeration, some comparative relationships can be performed in order to validate some methodologies. While the structure and morphology of the CNTs have a significant influence on the dispersion process, the influence of the diameter and the functionalization treatment on the properties of the nanocomposites is also identified. The experimental results show that the decrease in the diameter of the CNTs and the use of functionalized CNTs also contribute to the obtention of lower mechanical properties of the nanocomposites, as is pointed out in the results of MD carried out in nanocomposites.

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