Evaluation of elastic properties of graphene nanoplatelet/epoxy nanocomposites

Mahmun, Amdadul; Kirtania, Sushen

doi:10.1016/j.matpr.2020.11.735

Cited by 13 publications

(5 citation statements)

References 11 publications

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“…The ν of 0.25 [ 67 ] was preconceived for the MWCNTs coating, 0.26 for TiO 2 [ 68 ], and 0.352 for Cu [ 69 ]. Assuming the MWCNTs/TiO 2 and MWCNTs_Cu coatings as unidirectional composite materials, the Halpin–Tsai (H-P) model was used to evaluate their ν, E [ 70 ], and H [ 71 ] values using the following relations:

where V r , ν r , E r , H r and V m , ν m , E m , H m are volume fraction, Poisson’s ratio, Young’s modulus, and hardness of the reinforcement and matrix, respectively. The volume fraction was calculated according to [ 71 ] and assuming densities of 2.10 g/cm 3 [ 72 ], 4.23 g/cm 3 [ 73 ], and 8.94 g/cm 3 [ 74 ] for MWCNTs, TiO 2 , and nanoCu, respectively.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti13Nb13Zr Alloy

et al. 2021

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Titanium implants are commonly used because of several advantages, but their surface modification is necessary to enhance bioactivity. Recently, their surface coatings were developed to induce local antibacterial properties. The aim of this research was to investigate and compare mechanical properties of three coatings: multi-wall carbon nanotubes (MWCNTs), bi-layer composed of an inner MWCNTs layer and an outer TiO2 layer, and dispersion coatings comprised of simultaneously deposited MWCNTs and nanoCu, each electrophoretically deposited on the Ti13Nb13Zr alloy. Optical microscopy, scanning electron microscopy, X-ray electron diffraction spectroscopy, and nanoindentation technique were applied to study topography, chemical composition, hardness, plastic and elastic properties. The results demonstrate that the addition of nanocopper or titanium dioxide to MWCNTs coating increases hardness, lowers Young’s modulus, improves plastic and elastic properties, wear resistance under deflection, and plastic deformation resistance. The results can be attributed to different properties, structure and geometry of applied particles, various deposition techniques, and the possible appearance of porous structures. These innovative coatings of simultaneously high strength and elasticity are promising to apply for deposition on long-term titanium implants.

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Section: Methodsmentioning

confidence: 99%

Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti13Nb13Zr Alloy

et al. 2021

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“…Table 3 shows the comparison of the elastic modulus for the Mg alloy and both effective elastic moduli of Ni electroplated, and Ni electroplated with HPC additive taken from the linear According to the nature of the composites, the rule of mixture can be suggested as an analytical model to evaluate the intrinsic elastic properties of the unidirectional composite materials [25]. Since the geometry and the size of the fiber are not effective parameters in the rule of mixture, it can be likewise applied to the sandwich structure [26,27].…”

Section: Resultsmentioning

confidence: 99%

Improving the mechanical strength of the Mg alloy with Ni electroplating

Kang

Kwak

2021

J Mech Sci Technol

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In this study, Ni electroplating is applied to the surface of the lightweight Mg alloy specimen to form a sandwich structure, and strengths improvement is quantitatively compared with the bare Mg alloy. Specifically, the mechanical properties of three specimens were compared one with another using mechanical tensile testing. Accordingly, two Ni electroplated specimens (Ni electroplated only and Ni electroplated with hydroxypropyl cellulose additive) were prepared and compared with the bare Mg alloy. As a result, both Ni electroplated specimens exhibit drastic improvement of the mechanical strength, which is attributed to the interaction between the sandwich structure covered with stiffer Ni material and grain refinement. Consequently, the rule of mixture was used to calculate the intrinsic elastic modulus of the Ni layer from the effective modulus. Finally, the calculated moduli were implemented using FEA (finite element analysis) and compared with the experimental results to examine their accuracy and validity.

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“…The new elastic modulus E GPl mat is calculated using the Halpin-Tsai homogenization model, 40 which is recommended to use over other analytical models. 41 This model is expressed as:…”

Section: Modeling Materials Properties Of Porous Gpls-reinforced Fgm ...mentioning

confidence: 99%

“…The new elastic modulus EmatGPl is calculated using the Halpin-Tsai homogenization model, 40 which is recommended to use over other analytical models. 41 This model is expressed as:where the parameters a GPl , b GPl and h GPl denote the average length, width and thickness of GPls, respectively. Note that the parameters η L and η T are not constant as in the case of isotropic matrix, but rather change with z because E mat = E mat ( z ).…”

Section: Modeling Materials Properties Of Porous Gpls-reinforced Fgm ...mentioning

confidence: 99%

Effects of graphene-platelets reinforcement on the free vibration, bending, and buckling of porous functionally-graded metal-ceramic plates

Hassaine,

Mahi

2023

Journal of Composite Materials

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This paper presents a first investigation of the mechanical behavior of porous functionally-graded material (FGM) plates reinforced with graphene platelets (GPls) nanomaterial. As a main purpose, we extend the research on GPls incorporation from single-component matrix materials to porous metal-ceramic FGMs. Four different through-thickness distributions of GPls and porosities were investigated. The effective elastic modulus of GPls-reinforced FGM was calculated using the Halpin-Tsai homogenization model, and the effect of porosities on elastic properties was considered by an exponential model that is more accurate than the common rule of mixture. A recent hyperbolic higher-order plate theory that satisfies the traction-free boundary conditions and a parabolic variation of shear stresses was used to model kinematics. The influence of various parameters was studied after method validation, and it was revealed that GPls not only can improve the stiffness and mechanical response of FGM plates, but can also eliminate the inherent transverse anisotropy of FGMs and uncouple the static response when dispersed in proper distribution pattern. This effect will result in zero mid-plane extension in bending conditions, in a similar behavior to isotropic plates.

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Evaluation of elastic properties of graphene nanoplatelet/epoxy nanocomposites

Cited by 13 publications

References 11 publications

Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti13Nb13Zr Alloy

Mechanical Behavior of Bi-Layer and Dispersion Coatings Composed of Several Nanostructures on Ti13Nb13Zr Alloy

Improving the mechanical strength of the Mg alloy with Ni electroplating

Effects of graphene-platelets reinforcement on the free vibration, bending, and buckling of porous functionally-graded metal-ceramic plates

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