ORCID Profile
0000-0002-7137-4507
Current Organisation
La Trobe University
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Publisher: Elsevier BV
Date: 02-2009
Publisher: Elsevier BV
Date: 05-2014
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 07-2017
Publisher: Elsevier BV
Date: 06-2019
Publisher: Elsevier BV
Date: 10-2009
Publisher: Elsevier BV
Date: 07-2015
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 2011
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 11-2014
Publisher: Springer Science and Business Media LLC
Date: 13-10-2013
Publisher: Elsevier BV
Date: 09-2009
Publisher: Department of Polymer Engineering, Scientific Society of Mechanical Engineering
Date: 2014
Publisher: Elsevier BV
Date: 12-2017
Publisher: The Royal Society
Date: 10-2017
DOI: 10.1098/RSOS.170778
Abstract: It is generally recognized that dimethylformamide (DMF) and ethanol are good media to uniformly disperse graphene, and therefore have been used widely in the preparation of epoxy/graphene nanocomposites. However, as a solvent to disperse graphene, dichlorobenzene (DCB) has not been fully realized by the polymer community. Owing to high values of the dispersion component ( δ d ) of the Hildebrand solubility parameter, DCB is considered as a suitable solvent for homogeneous graphene dispersion. Therefore, epoxy/graphene nanocomposites have been prepared for the first time with DCB as a dispersant DMF and ethanol have been chosen as the reference. The colloidal stability, mechanical properties, thermogravimetric analysis, dynamic mechanical analysis and scanning electron microscopic images of nanocomposites have been obtained. The results show that with the use of DCB, the tensile strength of graphene has been improved from 64.46 to 69.32 MPa, and its flexural strength has been increased from 97.17 to 104.77 MPa. DCB is found to be more effective than DMF and ethanol for making stable and homogeneous graphene dispersion and composites.
Publisher: Elsevier BV
Date: 05-2021
Publisher: Elsevier BV
Date: 09-2016
Publisher: Springer Science and Business Media LLC
Date: 22-09-2010
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 11-2012
Publisher: Elsevier BV
Date: 12-2014
Publisher: MDPI AG
Date: 25-05-2022
DOI: 10.3390/MATH10111822
Abstract: Analytical paradigms have limited conventional form-finding methods of tensegrities therefore, an innovative approach is urgently needed. This paper proposes a new form-finding method based on state-of-the-art deep learning techniques. One of the statical paradigms, a force density method, is substituted for trained deep neural networks to obtain necessary information of tensegrities. It is based on the differential evolution algorithm, where the eigenvalue decomposition process of the force density matrix and the process of the equilibrium matrix are not needed to find the feasible sets of nodal coordinates. Three well-known tensegrity ex les including a 2D two-strut, a 3D-truncated tetrahedron and an icosahedron tensegrity are presented for numerical verifications. The cases of the ReLU and Leaky ReLU activation functions show better results than those of the ELU and SELU. Moreover, the results of the proposed method are in good agreement with the analytical super-stable lines. Three ex les show that the proposed method exhibits more uniform final shapes of tensegrity, and much faster convergence history than those of the conventional one.
Publisher: Elsevier BV
Date: 04-2014
Publisher: Elsevier BV
Date: 10-2010
Publisher: Elsevier BV
Date: 06-2023
Publisher: SAGE Publications
Date: 07-02-2014
Abstract: A nonlocal sinusoidal plate model for micro/nanoscale plates is developed based on Eringen’s nonlocal elasticity theory and sinusoidal shear deformation plate theory. The small-scale effect is considered in the former theory while the transverse shear deformation effect is included in the latter theory. The proposed model accounts for sinusoidal variations of transverse shear strains through the thickness of the plate, and satisfies the stress-free boundary conditions on the plate surfaces, thus a shear correction factor is not required. Equations of motion and boundary conditions are derived from Hamilton’s principle. Analytical solutions for bending, buckling, and vibration of simply supported plates are presented, and the obtained results are compared with the existing solutions. The effects of small scale and shear deformation on the responses of the micro/nanoscale plates are investigated.
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 11-2009
Publisher: Informa UK Limited
Date: 26-12-2020
Publisher: World Scientific Pub Co Pte Lt
Date: 22-10-2018
DOI: 10.1142/S0219455418501304
Abstract: In this paper, the Ritz-based solutions are developed for the bending, buckling and vibration behaviors of laminated composite beams with arbitrary lay-ups. A quasi-3D theory, which accounts for a higher-order variation of both the axial and transverse displacements, is used to capture the effects of both shear and normal deformations on the behaviors of composite beams. Numerical results for various boundary conditions are presented and compared with existing ones available in the literature. Besides, the effects of fiber angle, span-to-height ratio, material anisotropy and Poisson’s ratio on the displacements, stresses, natural frequencies and buckling loads of the composite beams are investigated.
Publisher: Elsevier BV
Date: 03-2024
Publisher: Springer Science and Business Media LLC
Date: 18-10-2012
Publisher: Elsevier BV
Date: 12-2018
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 09-2012
Publisher: SAGE Publications
Date: 29-04-2015
Abstract: This paper presents an analytical solution for vibration and buckling of functionally graded (FG) sandwich beams using various quasi-3D theories, which consider effects of both shear and normal deformation. Sandwich beams with FG skins–homogeneous core and homogeneous skins–FG core are considered. By using the Hamilton’s principle, governing equations of motion are derived. An analytical solution is presented, and the obtained results by various quasi-3D theories are compared with each other and with the available solutions in the literature. The effects of normal strain, power-law indexes, skin–core–skin thickness and slenderness ratios on vibration and buckling behaviour of sandwich beams are investigated.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Informa UK Limited
Date: 20-12-2021
Publisher: Elsevier BV
Date: 07-2021
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 2015
Publisher: Elsevier BV
Date: 09-2007
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 2021
Publisher: Springer Singapore
Date: 2018
Publisher: Elsevier BV
Date: 03-2021
Publisher: Elsevier BV
Date: 2015
Publisher: Informa UK Limited
Date: 14-09-2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5RA13897C
Abstract: Graphene, a 2D fullerene, is a unique material because of its exceptional set of properties. This review has been focused on the processing methods and mechanical, electrical, thermal, and fire retardant properties of epoxy/graphene nanocomposites.
Publisher: SAGE Publications
Date: 18-12-2013
Abstract: An improved transverse shear stiffness for vibration and buckling analysis of functionally graded sandwich plates based on the first-order shear deformation theory is proposed in this paper. The transverse shear stress obtained from the in-plane stress and equilibrium equation allows to analytically derive an improved transverse shear stiffness and associated shear correction factor of the functionally graded sandwich plate. Sandwich plates with functionally graded faces and both homogeneous hardcore and softcore are considered. The material property is assumed to be isotropic at each point and vary through the plate thickness according to a power-law distribution of the volume fraction of the constituents. Equations of motion and boundary conditions are derived from Hamilton’s principle. The Navier-type solutions are obtained for simply supported boundary conditions, and exact formulae are proposed and compared with the existing solutions to verify the validity of the developed model. Numerical results are obtained for simply supported functionally graded sandwich plates made of three sets of material combinations of metal and ceramic, Al/Al 2 O 3 , Al/SiC and Al/WC to investigate the effects of the power-law index, thickness ratio of layer, material contrast on the shear correction factors, natural frequencies and critical buckling loads as well as load–frequency curves.
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 07-2012
Publisher: Elsevier BV
Date: 10-2018
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 2010
Publisher: SAGE Publications
Date: 12-10-2021
DOI: 10.1177/10775463211048272
Abstract: Several models within the framework of continuum mechanics have been proposed over the years to solve the free vibration problem of micro beams. Foremost amongst these are those based on non-local elasticity, classical couple stress, gradient elasticity and modified couple stress theories. Many of these models retain the basic features of the Bernoulli–Euler or Timoshenko–Ehrenfest theories, but they introduce one or more material scale length parameters to tackle the problem. The work described in this paper deals with the free vibration problems of micro beams based on the dynamic stiffness method, through the implementation of the modified couple stress theory in conjunction with the Timoshenko–Ehrenfest theory. The main advantage of the modified couple stress theory is that unlike other models, it uses only one material length scale parameter to account for the smallness of the structure. The current research is accomplished first by solving the governing differential equations of motion of a Timoshenko–Ehrenfest micro beam in free vibration in closed analytical form. The dynamic stiffness matrix of the beam is then formulated by relating the litudes of the forces to those of the corresponding displacements at the ends of the beam. The theory is applied using the Wittrick–Williams algorithm as solution technique to investigate the free vibration characteristics of Timoshenko–Ehrenfest micro beams. Natural frequencies and mode shapes of several ex les are presented, and the effects of the length scale parameter on the free vibration characteristics of Timoshenko–Ehrenfest micro beams are demonstrated.
Publisher: Elsevier BV
Date: 03-2010
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 05-2016
Publisher: Elsevier BV
Date: 12-2016
Publisher: Elsevier BV
Date: 03-2013
Publisher: Elsevier BV
Date: 06-2008
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 02-2012
Publisher: Springer Science and Business Media LLC
Date: 05-03-2010
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 2013
Publisher: SAGE Publications
Date: 29-08-2012
Abstract: Batches of multi-walled carbon nanotubes having an average length of 2091 nm were aggressively tip-ultrasonicated to produce shortened carbon nanotubes having average lengths of 1689 nm, 1332 nm, 992 nm and 503 nm. Raman spectroscopic analysis confirmed that the shortened carbon nanotubes retained their crystallinity after the shortening process. Carbon nanotubes were then dispersed in the epoxy matrix using high-shear mixing technique (calendering). The mechanical properties were measured for the cured epoxy–0.1 wt% carbon nanotube nanocomposites having carbon nanotubes of different lengths. It was found that the nanocomposites containing long carbon nanotubes (2091 nm and 1689 nm) possess higher tensile strength, elastic modulus, fracture strain and fracture toughness as compared to nanocomposites containing short carbon nanotubes (1332 nm, 992 nm and 503 nm).
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 12-2020
Publisher: World Scientific Pub Co Pte Lt
Date: 04-2020
DOI: 10.1142/S0219455420300037
Abstract: Structural steel frames exhibit significantly geometric and material nonlinearities which can be captured using the second-order inelastic analysis, also known as advanced analysis. Current specifications of most modern steel design codes, e.g. American code AISC360, European code EC3, Chinese code GB50017 and Australian code AS4100 permit the use of advanced analysis methods for the direct design of steel structures to avoid tedious member capacity checks. In the past three decades, a huge number of advanced analysis and modeling methods have been developed to predict the behavior of steel and composite frames. This paper presents a comprehensive review of their developments, which focus on beam-column elements with close attention to the way to capture geometric and material nonlinearity effects. A brief outline of analysis methods and analysis tools for frames was presented in the initial part of the paper. This was followed by a discussion on the development of displacement-based, force-based and mixed beam elements with distributed plasticity and concentrated plasticity models. The modeling of frames subjected to fire and explosion was also discussed. Finally, a review of the beam-column models for composite structures including concrete-filled steel tubular (CFST) columns, composite beams and composite frames was presented.
Publisher: Elsevier BV
Date: 02-2013
Publisher: Elsevier BV
Date: 07-2022
Publisher: Informa UK Limited
Date: 25-01-2021
Publisher: Elsevier BV
Date: 05-2012
Publisher: Hindawi Limited
Date: 2015
DOI: 10.1155/2015/561742
Abstract: The use of graphene nanocomposites in advanced applications has attracted much attention in recent years. However, in order to substitute traditional epoxy reinforcements with graphene, there are still some issues like dispersion, homogenization, and reaggregation. In this paper, graphene bundles dispersed in two-component epoxy system by bath sonication, dispersion state, and reaggregation behavior of graphene in this system have been studied. Light transmittance in ultraviolet-visible spectroscopy has been used to quantify the reaggregation by a series of controlled experiments. After 18 mins sonication of 0.005 wt% graphene dispersion at 20°C, the light transmittance decreased from 68.92% to 54.88% in liquid epoxy and decreased from 72.80% to 46.42% in hardener while increasing the temperature from 20°C to 60°C, the light transmittance in liquid epoxy decreased from 65.96% to 53.21% after 6 mins sonication. With the incorporation of 0.3 wt% graphene, the tensile strength of nanocomposites increased from 57.2 MPa to 64.4 MPa and the storage modulus increased from 1.66 GPa to 2.16 GPa. The results showed that the dispersion state depends on the function of sonication time and temperature, and graphene has a significant reinforcement effect on epoxy.
Publisher: Springer Science and Business Media LLC
Date: 17-07-2013
Publisher: Elsevier BV
Date: 09-2012
Publisher: SAGE Publications
Date: 10-04-2018
Abstract: Recently, graphene has attracted extensive research interests due to its superior mechanical, electrical and thermal performance. Small loadings of graphene can increase the properties of epoxy significantly. However, because of the large surface area of graphene, it is a challenge to disperse graphene in liquid epoxy. Strong van der Waals force causes reaggregation of graphene in the matrix. As commonly used surfactants, sodium dodecyl sulphate and gum arabic have been used a lot to de-bundle graphene, however, their dispersing efficiencies for graphene in epoxy matrix is unknown. Therefore, to evaluate their dispersing efficiencies, epoxy/graphene nanocomposites had been made and mechanical properties, dynamic mechanical analysis, thermal gravimetric analysis and scanning electron microscopy tests of nanocomposites had been conducted. The results show that the properties of nanocomposites had been enhanced largely after using sodium dodecyl sulphate and gum arabic. Sodium dodecyl sulphate shows higher dispersing effectiveness than gum arabic.
Publisher: Elsevier BV
Date: 07-2008
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 02-2010
Publisher: Elsevier BV
Date: 09-2009
Publisher: Elsevier BV
Date: 03-2014
Publisher: American Society of Civil Engineers
Date: 17-06-2014
Publisher: MDPI AG
Date: 27-05-2017
DOI: 10.3390/POLYM9060193
Abstract: DMF is one the most commonly-used solvents for preparing graphene nanocomposites. Various processing variables for DMF are being used for the preparation of epoxy/graphene nanocomposites. Whilst the emphasis of all of these reported studies are on the improvements in mechanical, and other properties, of the epoxy/graphene nanocomposites, there is no study investigating how DMF affects the processing and how it is associated with the final properties of the nanocomposites. In this work, different dosages of DMF have been used to prepare nanocomposites. Mechanical testing, X-ray diffraction (XRD), dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), and scanning electron microscopy (SEM) have been used to analyze the effectiveness of DMF dosage on the properties of processed nanocomposites. Larger dosages of DMF are not always ideal for dispersing graphene as it promotes reaggregation of graphene during the processing.
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier BV
Date: 08-2007
Publisher: Elsevier BV
Date: 11-2023
Publisher: Elsevier BV
Date: 2017
Publisher: Elsevier BV
Date: 08-2009
Publisher: Elsevier BV
Date: 12-2017
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Thuc Vo.