Fabrication and characterization of functionally graded synthetic graphite/phenolic nanocomposites

Bafekrpour, Ehsan; Simon, George P.; Habsuda, Jana; Naebe, Minoo; Yang, Chunhui; Fox, Bronwyn

doi:10.1016/j.msea.2012.02.097

Cited by 51 publications

(28 citation statements)

References 41 publications

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“…(17), (20) and (22) into Eq. (15) and setting the coefficients of qu, qw and d(qw/ qw) to zero, the following Euler-Lagrange equation can be obtained:…”

Section: Euler-bernoulli Beam Theory (Ebt)mentioning

confidence: 99%

“…Furthermore, different fabrication processes of nanoscale functionally graded material have been focused by the several researchers [18,19]. The design and fabrication of stepwise functionally graded synthetic nanocomposites using combined powder stacking and compression molding techniques were studied by Bafekrpour et al [20]. They concluded that the electrical and thermal properties of nanocomposites could be manipulated by changing the gradient patterns.…”

Section: Introductionmentioning

confidence: 99%

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In-plane thermal loading effects on vibrational characteristics of functionally graded nanobeams

2015

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In the present study, the effect of in-plane thermal loading on vibrational behaviour of functionally graded (FG) nanobeams are carried out by presenting both Navier type solution and differential transform method. Classical and first order shear deformation beam theories are adopted to count for the effect of shear deformations. Thermo-mechanical properties of FG nanobeam are supposed to vary smoothly throughout the thickness based on powerlaw model and material properties are assumed to be temperature-dependent. Eringen's nonlocal elasticity theory is exploited to describe the size dependency of FG nanobeam. Using Hamilton's principle, the nonlocal equations of motion together with corresponding boundary conditions are obtained for the free vibration analysis of FG nanobeams based on Euler-Bernoulli and Timoshenko beam theories. According to the numerical results, it is revealed that the proposed modeling and semi analytical approach can provide accurate frequency results of the FG nanobeams as compared to analytical results and also some cases in the literature. In following a parametric study is accompanied to examine the effects of the several parameters such as temperature change, gradient indexes, small scale parameter, mode number and boundary conditions on the natural frequencies of the temperature-dependent FG nanobeams in detail. It is explicitly shown that the vibration behaviour of a FG nanobeam are significantly influenced by these effects. Numerical results are presented to serve as benchmarks for future analyses of FG nanobeams.

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“…(17), (20) and (22) into Eq. (15) and setting the coefficients of qu, qw and d(qw/ qw) to zero, the following Euler-Lagrange equation can be obtained:…”

Section: Euler-bernoulli Beam Theory (Ebt)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

In-plane thermal loading effects on vibrational characteristics of functionally graded nanobeams

2015

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“…FGN-4 had a reverse compositional change compared to FGN-3. More details of sample designs can be found in our previous publications [35,37].…”

Section: Functionally Graded Nanocomposite Beam Designmentioning

confidence: 99%

“…Nanofiller-reinforced FGMs have recently received growing attention as forthcoming advanced materials with novel properties and functions. We have recently reported the fabrication of functionally-graded synthetic graphite/phenolic composites with a significant improvement in thermo-mechanical and viscoelastic properties [35,36]. We also showed that the temperature gradient field and transient time of functionally-graded composites are highly influenced by the compositional gradients [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Functionally graded carbon nanofiber/phenolic nanocomposites and their mechanical properties

Bafekrpour

Yang

Natali

et al. 2013

Composites Part A: Applied Science and Manufacturing

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“…Heterogeneous spatial distribution of two or more components along the thickness of the product may have better performance characteristics such as thermal stress relaxation, adhesive property and mechanical properties as compared to the same material in homogeneous compositional state and this gives scientists a wide range of possibilities to manipulate the properties of these materials depending on requirements and future applications [4]. For example, Bafekrpour et al [5] realized a heterogeneous distribution of graphite in phenolic matrix 232 Non-uniform dispersion of toughening agents and its influence on the mechanical properties of polypropylene Z. Li, C. M. Liu, H. L. Liu, K. Wang, Q. Fu using powder stacking and compression molding techniques. The authors reported that the nanocomposites with the highest graphite content layer on the top and bottom surfaces and the lowest in the center, showed the highest improvement of thermomechanical properties and creep recovery among all filler distribution conditions.…”

Section: Introductionmentioning

confidence: 99%

Non-uniform dispersion of toughening agents and its influence on the mechanical properties of polypropylene

Li¹,

Liu²,

Liu³

et al. 2014

Express Polym. Lett.

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Abstract. To achieve excellent properties of polymer blends and composites, good dispersion and uniform distribution of second component or filler in the matrix are often required. However, more and more evidences reveal that uniform distribution is not always the best. To further prove this idea, in this work, we purposely designed and prepared different samples of isotactic polypropylene (iPP)/elastomer or iPP/!-nucleating agent with uniform and non-uniform distribution of the modifiers via stacking the blending sheets in different sequence. It was found that for a given amount of toughening agent, the impact strength of polymer blends with non-uniform distribution of elastomer or !-nucleating agent could be much higher than its uniformly dispersed counterpart, while the tensile strength and tensile modulus remain relatively constant. The instrumented impact test confirmed that among the samples with different layered structures, the absorbed energy during crack initiation differs little from each other. Whereas absorbed energy during crack propagation process shows the same trend as final impact strength, making it the controlling parameter during the impact process. When cracks are initiated at higher toughening agents content side, the relatively smooth fracture surfaces near the crack edge area proved that they absorb small energy and the adjacent inner part showed obviously plastic deformation, corresponding to higher energy absorption. Our work demonstrates again that design and control of the hierarchical structure of polymer articles is vital for high performance properties and non-uniform distribution of filler could be much better than the uniform distribution.

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Fabrication and characterization of functionally graded synthetic graphite/phenolic nanocomposites

Cited by 51 publications

References 41 publications

In-plane thermal loading effects on vibrational characteristics of functionally graded nanobeams

In-plane thermal loading effects on vibrational characteristics of functionally graded nanobeams

Functionally graded carbon nanofiber/phenolic nanocomposites and their mechanical properties

Non-uniform dispersion of toughening agents and its influence on the mechanical properties of polypropylene

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