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学者姓名：王景甫
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Abstract ：
Structural defects in graphene are inevitable during the production process, which have remarkable impacts on the mechanical properties of graphene and further affect the properties of nanocomposite reinforced by graphene. In this work, a bottom-up multiscale approach is employed to investigate the nonlinear dynamics of defective graphene reinforced composite plates from the material properties of nanocomposites to the dynamic behavior of macro-composite plates. The molecular modeling and simulation are conducted by molecular dynamics (MD) to evaluate the effective mechanical properties of pristine graphene, vacancy defective graphene, Stone-Wales defective graphene, poly (methyl methacrylate) (PMMA) and graphene/PMMA composites reinforced by different graphene configurations at the nano-scale. Meanwhile, the fracture mechanism and interfacial interaction energy between graphene and PMMA matrix during the deformation process are examined to explore the enhancement mechanism of nanocomposites. The efficiency parameters are derived by incorporating the MD results and the extended Halpin-Tsai micromechanics model to capture the heterogeneity of nanocomposite at the nano-scale as well as the continuum scale, and then the effective material properties considering the effect of defect, temperature and pressure are substituted into the nonlinear dynamics of functionally graded graphene reinforced composite (FG-GRC) plates at the macro-scale. The governing equations of motion for FG-GRC plates under the aerodynamic pressure are derived based on the third-order shear deformation theory, von-Karman nonlinear strain-displacement relation and Hamilton's principle. The aerodynamic pressure acting on the surface of the plate consists of two parts, one is the static pressure, and the other is the disturbed air flow. Furthermore, Galerkin method and the fourth-order Runge-Kutta method are exploited to discrete and solve the governing equations of motion. The bifurcation, time history and phase diagrams of FG-GRC plates are obtained to analyze the dynamic characteristics of the plates. This study reveals the nonlinear dynamic characteristics of graphene/PMMA composite plate, which contributes to the prediction of dynamic response of composite structure in the aerospace field.
Keyword ：
Aerodynamic Aerodynamic Efficiency parameter Efficiency parameter Multiscale modeling Multiscale modeling Nonlinear dynamics Nonlinear dynamics Molecular dynamics Molecular dynamics
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| GB/T 7714 | Wang, J. F. , Li, X. L. , Shi, S. Q. et al. Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure [J]. | NONLINEAR DYNAMICS , 2023 , 111 (13) : 11851-11884 . |
| MLA | Wang, J. F. et al. "Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure" . | NONLINEAR DYNAMICS 111 . 13 (2023) : 11851-11884 . |
| APA | Wang, J. F. , Li, X. L. , Shi, S. Q. , Guo, X. Y. . Multiscale nonlinear dynamics analysis of defective graphene reinforced PMMA composite plates under aerodynamic pressure . | NONLINEAR DYNAMICS , 2023 , 111 (13) , 11851-11884 . |
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Abstract ：
Extinction limits and flame microstructures of CH4 versus air (N-2/O-2) counterflow diffusion flames with additional CO2 to oxidizer stream under various pressure conditions were numerically investigated by a proposed decoupled strategy. The chemical and thermal effects of CO2 addition were isolated from the synergistic effect on extinction limits and flame microstructures. The results show that the extinction limits were decreased due to the CO2 addition and extended caused by the enhanced pressure, respectively. The changes of flame microstructures from far away from extinction to near extinction mainly are reflected in a narrower combustion zone and thinner flame thickness, while there is no visible displacement of the flame front location. Quantitative analyses manifest the thermal effect of CO2 addition on extinction limit is greater than chemical effect, and elevated pressure can enhance both thermal and chemical effects. An interesting phenomenon occurred between the thermal and chemical effects resulting from increasing CO2 mole fraction in an oxidizer on extinction limit; the former monotonically increase along with CO2 mole fraction, while the latter represents a kind of approximate quadratic-parabola tend along with CO2 mole fraction. The distributions of the production and consumption rate of hydroxyl (OH) radicals were presented to clarify the contribution of the kinetic term in the asymptotic solution to the extinction limits with increasing CO2 molar fraction and various pressures.
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Li, Jianrong et al. A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures [J]. | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
| MLA | Chen, Ying et al. "A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures" . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH 2023 (2023) . |
| APA | Chen, Ying , Wang, Jingfu , Li, Jianrong , Zhang, Jian . A Numerical Study of CO2 Decoupled Effects on Extinction Limit and Flame Microstructure in CH4/Air Counterflow Diffusion Flame with Various Pressures . | INTERNATIONAL JOURNAL OF ENERGY RESEARCH , 2023 , 2023 . |
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Abstract ：
Delamination is one of the failure modes of functionally graded materials (FGM), resulting in the critical change of vibration characteristics. The Chebyshev polynomials are commonly used as admissible functions to improve the computational efficiency of numerical algorithms and avoid the occurrence of ill-conditioned problems. This paper extends the Chebyshev-Ritz method to the free vibration analysis of delaminated FGM plates, in which the material variation through the plate thickness follows the exponential-law distribution. A plane crack that is considered to be perpendicular to the thickness direction penetrates through the width direction. Based on the region approach, the analysis of FGM plates with a mid-plane delamination is divided into four sub-regions. The kinetic energy and potential energy of each sub-region are derived by the thin plate theory and von Karman nonlinear strain-displacement relation. The modal functions of the displacement fields of FGM plates can be constructed in accordance with the displacement continuity conditions of the delamination interface and the boundary conditions of such plates. The effects of asymmetric material distribution, delamination length ratio, Young's modulus ratio, and boundary support on the vibration behavior of FGM plates are investigated. This semi-analytical study provides a reasonable theoretical basis for the behavior prediction and delamination identification of composite structures.
Keyword ：
FGM plate FGM plate Delamination Delamination Chebyshev polynomials Chebyshev polynomials vibration vibration
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| GB/T 7714 | Wang, J. F. , Cao, G. , Song, Z. W. et al. Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method [J]. | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2023 , 23 (16N18) . |
| MLA | Wang, J. F. et al. "Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method" . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS 23 . 16N18 (2023) . |
| APA | Wang, J. F. , Cao, G. , Song, Z. W. , Lai, S. K. . Dynamic Analysis of FGM Plates with Variable Delamination Parameters by the Chebyshev-Ritz Method . | INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS , 2023 , 23 (16N18) . |
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Abstract ：
Owing to the excellent mechanical properties, polymethyl methacrylate (PMMA)/carbon nanotube (CNT) composite has been increasingly adopted in the aerospace field, which is usually subjected to various temperature conditions and supersonic aerodynamic loads. Using a molecular dynamics (MD)-based multiscale simulation, the nonlinear forced vibration of PMMA/CNT composite plate is investigated under coupled temperature and aerodynamic load conditions. The longitudinal, transverse and shear moduli of PMMA/single-walled CNT (SWCNT) nanocomposite obtained from MD simulation at different temperature and pressure levels are substituted into the extended rule of mixtures to establish the constitutive equations of PMMA/CNT composite plate. Meanwhile, Poisson's ratio and thermal expansion coefficient of nanocomposite are used in the constitutive equations. Based on the third-order shear deformation theory, von Karman nonlinear strain-displacement relation and Hamilton's principle, the partial differential equation of composite plate is derived, which is reduced into a set of coupled ordinary differential equations by applying Galerkin method and is solved using the fourth-order Runge-Kutta method. The bifurcation diagrams, phase portraits, time histories and Poincare maps of composite plate are obtained under the complex loads including transverse harmonic excitation and aerodynamic pressure, which are applied to analyze the dynamic characteristics of system. This study reveals the nonlinear dynamic characteristics of PMMA/CNT composite plate, which contributes to the prediction of long-term performance of composite materials in aerospace field.
Keyword ：
Nonlinear dynamics Nonlinear dynamics Efficiency parameter Efficiency parameter Aerodynamic Aerodynamic Composite structure Composite structure Multiscale simulation Multiscale simulation
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| GB/T 7714 | Wang, J. F. , Shi, S. Q. , Liu, Y. Z. et al. Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates [J]. | NONLINEAR DYNAMICS , 2022 , 109 (3) : 1517-1550 . |
| MLA | Wang, J. F. et al. "Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates" . | NONLINEAR DYNAMICS 109 . 3 (2022) : 1517-1550 . |
| APA | Wang, J. F. , Shi, S. Q. , Liu, Y. Z. , Yang, J. P. , Tam, Lik-ho . Multiscale simulation of temperature- and pressure-dependent nonlinear dynamics of PMMA/CNT composite plates . | NONLINEAR DYNAMICS , 2022 , 109 (3) , 1517-1550 . |
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Abstract ：
Purpose In this paper, the nonlinear vibration behavior of functionally graded carbon nanotube reinforced composite (FG-CNTRC) plates is investigated by meshless method. Methods The efficiency parameters, which clearly affect the mechanical properties of the composite materials, are characterized by polynomial expressions for different CNT contents, and applied as the inputs in the vibration analysis of plate structure. Four distributions of CNTs along the thickness of composite plate are considered, namely, the uniform distribution (UD), FG-O, FG-X and FG-V. Based on the classical plate theory and von Karman strain-displacement relation, the governing equations of motion are derived by the virtual displacement principle. Based on the reproducing kernel particle method (RKPM), the discrete governing equations for the vibration of the FG-CNTRC plates are derived. The linearized updated mode (LUM) method is adopted to solve the iteration process of governing equations. Results Numerical results are employed to investigate the effects of boundary condition, aspect ratio, volume fraction and arrangement of CNT on the nonlinear vibration characteristics of composite plates.
Keyword ：
Reproducing kernel particle method Reproducing kernel particle method Efficiency parameter Efficiency parameter Carbon nanotube Carbon nanotube Nonlinear vibration Nonlinear vibration Functionally graded material Functionally graded material
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| GB/T 7714 | Zhang, W. , He, L. J. , Wang, J. F. . Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes [J]. | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2022 , 10 (4) : 1253-1264 . |
| MLA | Zhang, W. et al. "Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes" . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES 10 . 4 (2022) : 1253-1264 . |
| APA | Zhang, W. , He, L. J. , Wang, J. F. . Content-Dependent Nonlinear Vibration of Composite Plates Reinforced with Carbon Nanotubes . | JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES , 2022 , 10 (4) , 1253-1264 . |
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Abstract ：
The volume fraction of the carbon nanotube (CNT) plays a key role in ensuring the performance of the CNT reinforced polymer composite, especially under the severe vibration, which leads to the resonance and failure of the composite structure. In this paper, a bottom-up multiscale method is adopted to study the effect of the CNT volume fractions on the nonlinear vibration of the poly (methyl methacrylate) (PMMA)/CNT composite. According to the molecular simulation, the longitudinal, transverse and shear moduli of the PMMA/CNT nanocomposites are found to increase with the increasing CNT volume fractions. Substituting the simulated moduli into the extended rule of mixtures (EROM), the efficiency parameters of the PMMA/CNT composite with various CNT volume fractions are derived based on a homogenization approach. The derived efficiency parameters are used in the functionally graded (FG)-based EROM to obtain the expressions of the longitudinal, transverse and shear moduli of the macroscopic composite plate, so as to obtain the constitutive equation for the nonlinear vibrations of the FG-based PMMA/CNT composite plate. The subsequent meshless simulation results demonstrate that the natural frequencies of the FG-based composite plate increase with the increasing volume fractions, whereas the ratios of the nonlinear to linear frequencies decrease. Using the bottom-up multiscale analysis, the macroscopic vibration responses are analyzed for the PMMA/CNT composites with the CNT volume fractions up to 9.0%, which provides a paradigm of the design of the PMMA/CNT composite by considering the CNT volume fraction effect.
Keyword ：
Meshless simulation Meshless simulation Molecular dynamics Molecular dynamics CNT composite CNT composite Nonlinear vibration Nonlinear vibration CNT volume fraction CNT volume fraction PMMA PMMA
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| GB/T 7714 | Wang, J. F. , Yang, J. P. , Tam, L-H et al. Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation [J]. | THIN-WALLED STRUCTURES , 2022 , 170 . |
| MLA | Wang, J. F. et al. "Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation" . | THIN-WALLED STRUCTURES 170 (2022) . |
| APA | Wang, J. F. , Yang, J. P. , Tam, L-H , Zhang, W. . Effect of CNT volume fractions on nonlinear vibrations of PMMA/CNT composite plates: A multiscale simulation . | THIN-WALLED STRUCTURES , 2022 , 170 . |
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Abstract ：
To study the laminar premixed flame characteristics of methane under an O-2/CO2 atmosphere in high pressure, a new simplified chemical mechanism (44 steps and 19 species) was extracted from the GRI-Mech 3.0 mechanism. The sensitivity coefficient analysis method is used to retain the elementary reactions that have great influence on the target parameters and remove other secondary elementary reactions. Meanwhile, the closeness of the simplified mechanism initially obtained was verified. The results of the laminar burning velocities, the distribution of the main species, and the ignition delay time were compared between the two mechanisms for the premixed flame and the ignition process. Overall, the simplified mechanisms performed fairly well over a wide range of pressure, equivalence ratio, and fuel mixture composition.
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Li, Conghao et al. Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure [J]. | ACS OMEGA , 2021 , 6 (29) : 18569-18575 . |
| MLA | Chen, Ying et al. "Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure" . | ACS OMEGA 6 . 29 (2021) : 18569-18575 . |
| APA | Chen, Ying , Wang, Jingfu , Li, Conghao , Zhang, Xiaolei . Development and Verification of the New Simplified Mechanism for CH4/O-2/CO2 Laminar Premixed Flame under High Pressure . | ACS OMEGA , 2021 , 6 (29) , 18569-18575 . |
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Abstract ：
Ammonia (NH3) is not only expected to be used as a hydrogen energy carrier but also expected to become a carbon-free fuel. Methane (CH4) can be used as a combustion enhancer for improving the combustion intensity of NH3. In addition, it is important to understand the flame characteristics of NH3-air at elevated pressures and temperatures. The laminar flame speed of NH3-CH4-air is numerically investigated, where the mole fraction of CH4 ranges from 0 to 50% in binary fuels and the pressure and initial temperature are up to 10 atm and 1000 K, respectively. The calculated value from the Okafor mechanism is in excellent agreement with experimental data. The CH4 in the fuel affects the flame speed by changing the main species of free radicals in the flame; the high pressure not only increases the rate-limiting reaction rate in the flame but also reduces the amount of H, O, and OH radicals in the flame, so as to restrain the propagation of the flame. At a higher initial temperature, the faster flame speed is mainly due to the higher adiabatic flame temperature. The laminar flame speed correlation equation has a consistent trend with the simulation results, though with a slight underestimation at higher pressures and temperatures. It is a more effective way to calculate the laminar flame speeds of NH3-air for a given pressure and temperature.
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| GB/T 7714 | Zhang Xiaolei , Wang Jingfu , Chen Ying et al. Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture. [J]. | ACS omega , 2021 , 6 (18) : 11857-11868 . |
| MLA | Zhang Xiaolei et al. "Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture." . | ACS omega 6 . 18 (2021) : 11857-11868 . |
| APA | Zhang Xiaolei , Wang Jingfu , Chen Ying , Li Conghao . Effect of CH4, Pressure, and Initial Temperature on the Laminar Flame Speed of an NH3-Air Mixture. . | ACS omega , 2021 , 6 (18) , 11857-11868 . |
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Abstract ：
The effects (chemical, thermal, transport, and radiative) of CO2 added to the fuel side and oxidizer side on the flame temperature and the position of the flame front in a one-dimensional laminar counterflow diffusion flame of methane/N-2/O-2 were studied. Overall CO2 resulted in a decrease in flame temperature whether on the fuel side or on the oxidizer side, with the negative effect being more obvious on the latter side. The prominent effects of CO2 on the flame temperature were derived from its thermal properties on the fuel side and its radiative properties on the oxidizer side. The results also highlighted the differences in the four effects of CO2 on the position of the flame front on different sides. In addition, an analysis of OH and H radicals and the heat release rate of the main reactions illustrated how CO2 affects the flame temperature.
Keyword ：
CH4 counterflow diffusion flame CH4 counterflow diffusion flame flame front flame front temperature temperature CO2 dilution CO2 dilution
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei et al. The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame [J]. | MOLECULES , 2021 , 26 (10) . |
| MLA | Chen, Ying et al. "The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame" . | MOLECULES 26 . 10 (2021) . |
| APA | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei , Li, Conghao . The Effects of CO2 Additional on Flame Characteristics in the CH4/N-2/O-2 Counterflow Diffusion Flame . | MOLECULES , 2021 , 26 (10) . |
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Abstract ：
A comprehensive numerical investigation of the uncoupled chemical, thermal, and transport effects of CO2 on the temperature of CH4/O-2 counterflow diffusion flame under high pressure up to 5 atm was conducted. Three pairs of artificial species were introduced to distinguish the chemical effect, thermal effect, and the transport effect of CO2 on the flame temperature. The numerical results showed that both the chemical effect and the thermal effect of the CO2 dilution in the oxidizer side can decrease the flame temperature significantly, while the transport effect of CO2 can only slightly increase the flame temperature and can even be ignored. The reduction value of the temperature caused by the chemical effect of CO2 grows linearly, while that caused by the thermal effect increases exponentially. The RPchem and RPthermal are defined to explain the temperature reduction percentage due to the chemical effect and the thermal effect of CO2 in the total temperature reduction caused by CO2 dilution, respectively. The RPchem decreases with the increase of the pressure, the strain rate, and the CO2 dilution ratio, while the RPthermal thermal behaves in the opposite manner. In the above conditions, the chemical effect plays a dominant role on the flame temperature reduction.
Keyword ：
thermal effect thermal effect counterflow flame counterflow flame methane methane chemical effect chemical effect CO2 dilution CO2 dilution
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| GB/T 7714 | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei et al. Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure [J]. | APPLIED SCIENCES-BASEL , 2021 , 11 (4) . |
| MLA | Chen, Ying et al. "Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure" . | APPLIED SCIENCES-BASEL 11 . 4 (2021) . |
| APA | Chen, Ying , Wang, Jingfu , Zhang, Xiaolei , Li, Conghao . Comparisons of the Uncoupled Effects of CO2 on the CH4/O-2 Counterflow Diffusion Flame under High Pressure . | APPLIED SCIENCES-BASEL , 2021 , 11 (4) . |
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