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Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves EI SCIE Scopus
期刊论文 | 2018 , 37 (1) | JOURNAL OF NONDESTRUCTIVE EVALUATION
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Abstract :

This research develops a new technique for the measurement of interfacial fracture toughness of films/surface coatings using laser-induced ultrasonic waves. Using pulsed laser ablation on the bottom substrate surface, strong stress waves are generated leading to interfacial fractures and coating delamination. Simultaneously, a laser ultrasonic interferometer is used to measure the normal (out-of-plane) displacement of the top surface coating in order to detect coating delamination in a non-destructive manner. We can thus determine the critical laser energy for delamination, yielding the critical stress (that is, the interfacial strength). Subsequently, to examine the interfacial fracture toughness, additional pulsed laser irradiation is applied to a pre-delaminated specimen to show that the delamination area expands. This type of interfacial crack growth can be visualized using laser ultrasonic scanning. Furthermore, the calculation of elastic wave propagation was carried out using a finite-difference time-domain method) in order to accurately estimate the interfacial stress field. In this calculation, the stress distribution around the initial delamination is calculated to obtain the stress intensity factor. Based on the experimental and computational results, interfacial fracture toughness can be quantitatively evaluated. Since this technique relies on a two-laser system in a non-contact approach, it may be useful for a quantitative evaluation of adhesion/bonding quality (including both interfacial fracture strength and toughness) in various environments.

Keyword :

Surface coating Interfacial fracture toughness Delamination Pulsed-laser-induced ultrasonic wave

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GB/T 7714 Watanabe, Yousuke , Yonezu, Akio , Chen, Xi . Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves [J]. | JOURNAL OF NONDESTRUCTIVE EVALUATION , 2018 , 37 (1) .
MLA Watanabe, Yousuke 等. "Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves" . | JOURNAL OF NONDESTRUCTIVE EVALUATION 37 . 1 (2018) .
APA Watanabe, Yousuke , Yonezu, Akio , Chen, Xi . Measurement of Interfacial Fracture Toughness of Surface Coatings Using Pulsed-Laser-Induced Ultrasonic Waves . | JOURNAL OF NONDESTRUCTIVE EVALUATION , 2018 , 37 (1) .
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Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces SCIE Scopus
期刊论文 | 2018 , 73 (1) , 57-67 | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
WoS CC Cited Count: 1
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Abstract :

As an increasing variety of composite materials with complex interfaces are emerging, we develop a theory to investigate composite beams and shed some light on new physical insights into composite beams with sinusoidal periodically varying interfaces. For the natural vibration of composite beams with continuous or periodically varying interfaces, the governing equation has been derived according to the generalised Hamiltonian principle. For composite beams having different boundary conditions, we transform the governing equations into integral equations and solve them by using the sinusoidal functions as test functions as well as the basis of the vibration modes. Due to the orthogonality of the sinusoidal functions, expansion coefficients in closed form can be found. Therefore, the proposed iterative schemes, with the help of the Rayleigh quotient and boundary functions, can quickly find the eigenvalues and free vibration modes. The obtained natural frequencies agree well with those obtained using the finite element method. In addition, the proposed method can be extended easily to laminated composite beams in more general cases or complex components and geometries in vibration engineering. The effects of different material properties of the upper and lower components and varying interface geometry function on the frequency of the composite beams are examined. According to our investigation, the natural frequency of a laminated beam with a continuous or periodically varying interface can be changed by altering the density or elastic modulus. We also show the responses of the frequencies of the components to the varying periodic interface.

Keyword :

Bernoulli-Euler Composite Beam Distinct Material Properties Natural Frequencies Iterative Scheme Boundary Functions

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GB/T 7714 Li, Botong , Liu, Chein-Shan , Zhu, Liangliang . Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces [J]. | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES , 2018 , 73 (1) : 57-67 .
MLA Li, Botong 等. "Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces" . | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES 73 . 1 (2018) : 57-67 .
APA Li, Botong , Liu, Chein-Shan , Zhu, Liangliang . Vibration Analysis of Composite Beams with Sinusoidal Periodically Varying Interfaces . | ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES , 2018 , 73 (1) , 57-67 .
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Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System SCIE Scopus
期刊论文 | 2018 , 8 (7) | APPLIED SCIENCES-BASEL
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Abstract :

Gaseous phase plays roles in a liquid/nanoporous system during application that adequate attention should be paid to the gaseous effects and the nanoscale gas-liquid interaction. In the present study, two glycerol/ZSM-5 zeolite systems with different amount of residual gas are compared by performing a series of experiments. Influences of loading rate, as well as system temperature on the gas-liquid interactions, are studied. Results show that vacuum degassing pretreatment is required to obtain a reversible and stable energy absorption system. Moreover, the influence of gas on a liquid/nanoporous system is found to mainly act on the liquid outflow. After the routine vacuum degassing pretreatment, the residual air that is left in the nanopores is around 0.9014 nm(-3) per unit specific pore volume, as presented in the current study. During compression, the existing gas left in the nanochannel tends to gather into the gas cluster, which further promotes the liquid outflow during unloading. However, excessively dissolved gas may reduce the driving force for liquid outflow by breaking the continuity of the liquid molecular chain in nanochannel. Consequently, small bubbles as a labile factor in the system must be excluded for the steady use of the system. This work sheds some light on the effect of the amount of residual gas on the liquid/nanoporous system and gives guidance on the pretreatment of the liquid/nanoporous material mixture before encapsulating.

Keyword :

liquid/nanoporous material system degassing pretreatment liquid outflow gas amount liquid-gas interaction

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GB/T 7714 Zhang, Yafei , Luo, Rui , Zhou, Qulan et al. Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System [J]. | APPLIED SCIENCES-BASEL , 2018 , 8 (7) .
MLA Zhang, Yafei et al. "Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System" . | APPLIED SCIENCES-BASEL 8 . 7 (2018) .
APA Zhang, Yafei , Luo, Rui , Zhou, Qulan , Chen, Xi , Dou, Yihua . Effect of Degassing on the Stability and Reversibility of Glycerol/ZSM-5 Zeolite System . | APPLIED SCIENCES-BASEL , 2018 , 8 (7) .
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Reply to 'On phonons and water flow enhancement in carbon nanotubes' SCIE PubMed
期刊论文 | 2017 , 12 (12) , 1108-1108 | NATURE NANOTECHNOLOGY | IF: 37.49
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GB/T 7714 Ma, Ming , Grey, Francois , Shen, Luming et al. Reply to 'On phonons and water flow enhancement in carbon nanotubes' [J]. | NATURE NANOTECHNOLOGY , 2017 , 12 (12) : 1108-1108 .
MLA Ma, Ming et al. "Reply to 'On phonons and water flow enhancement in carbon nanotubes'" . | NATURE NANOTECHNOLOGY 12 . 12 (2017) : 1108-1108 .
APA Ma, Ming , Grey, Francois , Shen, Luming , Urbakh, Michael , Wu, Shuai , Liu, Jefferson Zhe et al. Reply to 'On phonons and water flow enhancement in carbon nanotubes' . | NATURE NANOTECHNOLOGY , 2017 , 12 (12) , 1108-1108 .
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Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method EI SCIE Scopus
期刊论文 | 2017 , 105 , 90-101 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | IF: 3.891
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Abstract :

A particle-based meshless method, the moving particle semi-implicit (MPS) method, is employed in this study to simulate the process of liquid film breakup and atomization in a rotary atomizer. The computational framework incorporates a specially designed inlet flow model, a centrifugal force calculation, and a surface tension model to allow the simulation of the unsteady flow with extreme deformations. To improve efficiency, the searching algorithm of the MPS method is modified by eliminating redundant calculations. The computational framework is further utilized to systematically study the transition of the liquid from the bulk phase to a film, then to multiple belts, and finally to numerous droplets under the low pressure and flow rate conditions in the rotary atomization. Key mass transfer mechanisms underlying the atomization process are elucidated by a comprehensive analysis of the flow trajectories. The computational work is expected to improve the fundamental understanding of the rotary atomization process and facilitate future process optimization efforts. (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Moving particle semi-implicit method Mixture Computational efficiency Atomization Rotary atomizer

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GB/T 7714 Sun, Zhongguo , Chen, Xiao , Xi, Guang et al. Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 : 90-101 .
MLA Sun, Zhongguo et al. "Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 105 (2017) : 90-101 .
APA Sun, Zhongguo , Chen, Xiao , Xi, Guang , Liu, Ling , Chen, Xi . Mass transfer mechanisms of rotary atomization: A numerical study using the moving particle semi-implicit method . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2017 , 105 , 90-101 .
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Collective dynamics of cancer cells confined in a confluent monolayer of normal cells EI SCIE PubMed Scopus
期刊论文 | 2017 , 52 , 140-147 | JOURNAL OF BIOMECHANICS | IF: 2.431
WoS CC Cited Count: 5
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Tumorigenesis often involves specific changes in cell motility and intercellular adhesion. Understanding the collective cancer cell behavior associated with these specific changes could facilitate the detection of malignant characteristics during tumor growth and invasion. In this study, a cellular vertex model is developed to investigate the collective dynamics of a disk-like aggregate of cancer cells confined in a confluent monolayer of normal cells. The effects of intercellular adhesion and cell motility on tumor progression are examined. It is found that the stresses in both the cancer cells and the normal cells increase with tumor growth, resulting in a crowded environment and enhanced cell apoptosis. The intercellular adhesion between cancer cells and normal cells is revealed to promote tumor growth and invasion. The tumor invasion dynamics hinges on the motility of cancer cells. The cancer cells could orchestrate into different collective migration modes, e.g., directional migration and rotational oscillations, dictated by the competition between cell persistence and local coordination. Phase diagrams are established to reveal the competitive mechanisms. This work highlights the role of mechanics in regulating tumor growth and invasion. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Collective cellular dynamics Cell motility Cancer invasion Tumor growth

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GB/T 7714 Lin, Shao-Zhen , Li, Bo , Xu, Guang-Kui et al. Collective dynamics of cancer cells confined in a confluent monolayer of normal cells [J]. | JOURNAL OF BIOMECHANICS , 2017 , 52 : 140-147 .
MLA Lin, Shao-Zhen et al. "Collective dynamics of cancer cells confined in a confluent monolayer of normal cells" . | JOURNAL OF BIOMECHANICS 52 (2017) : 140-147 .
APA Lin, Shao-Zhen , Li, Bo , Xu, Guang-Kui , Feng, Xi-Qiao . Collective dynamics of cancer cells confined in a confluent monolayer of normal cells . | JOURNAL OF BIOMECHANICS , 2017 , 52 , 140-147 .
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Crashworthiness Analysis of Electric Vehicle With Energy-Absorbing Battery Modules EI SCIE Scopus
期刊论文 | 2017 , 139 (2) | JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME | IF: 0.828
WoS CC Cited Count: 1
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As a clean energy technology, the development of electric vehicles (EVs) is challenged by lightweight design, battery safety, and range. In this study, our simulations indicate that using a flexible structure of battery module has the potential to overcome the limitations in battery-powered EVs, contributing to a new design. Specifically, we focus on optimizing the structure of vehicle battery packs, aiming to improve the crashworthiness of EVs through frontal crash simulations. In addition, by considering battery packs as energy-absorption components, it is found that occupant compartment acceleration (OCA) is greatly reduced at an optimal working pressure of 4 MPa for battery module.

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GB/T 7714 Hao, Feng , Lu, Xiao , Qiao, Yu et al. Crashworthiness Analysis of Electric Vehicle With Energy-Absorbing Battery Modules [J]. | JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME , 2017 , 139 (2) .
MLA Hao, Feng et al. "Crashworthiness Analysis of Electric Vehicle With Energy-Absorbing Battery Modules" . | JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME 139 . 2 (2017) .
APA Hao, Feng , Lu, Xiao , Qiao, Yu , Chen, Xi . Crashworthiness Analysis of Electric Vehicle With Energy-Absorbing Battery Modules . | JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY-TRANSACTIONS OF THE ASME , 2017 , 139 (2) .
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Molecular dynamics simulation on explosive boiling of liquid argon film on copper nanochannels EI SCIE Scopus
期刊论文 | 2017 , 113 , 208-214 | APPLIED THERMAL ENGINEERING | IF: 3.771
WoS CC Cited Count: 3
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Phase change from liquid to vapor of the working fluid has been widely used in thermal control for microelectronic devices. In this study, the effects of nanochannels on the explosive phase transition of ultrathin liquid argon film on the copper substrate in confined space are investigated through molecular dynamics simulation. The results show that nanochannels significantly facilitate the thermal energy transfer from solid copper surface to the liquid argon which leads to a much more violent explosive boiling than the plain surface. Liquid argon atoms adjacent to the solid surface are instantly overheated and consequently a cluster of liquid argon detaches from the surface once the explosive boiling occurs. The temperature of the liquid argon when it separates from the solid surface increases with respect to the increasing nanochannel heights, while the time for the system to reach equilibrium decreases distinctly. Furthermore, though continuous heat transfers to the liquid argon, a non-vaporized layer always exists near the bottom surface of the solid copper base with a stable number density of about 0.025 1/A(3). (C) 2016 Elsevier Ltd. All rights reserved.

Keyword :

Liquid argon Molecular dynamics simulation Nanochannels Explosive boiling Phase transition

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GB/T 7714 Zhang, Shiwei , Hao, Feng , Chen, Haimu et al. Molecular dynamics simulation on explosive boiling of liquid argon film on copper nanochannels [J]. | APPLIED THERMAL ENGINEERING , 2017 , 113 : 208-214 .
MLA Zhang, Shiwei et al. "Molecular dynamics simulation on explosive boiling of liquid argon film on copper nanochannels" . | APPLIED THERMAL ENGINEERING 113 (2017) : 208-214 .
APA Zhang, Shiwei , Hao, Feng , Chen, Haimu , Yuan, Wei , Tang, Yong , Chen, Xi . Molecular dynamics simulation on explosive boiling of liquid argon film on copper nanochannels . | APPLIED THERMAL ENGINEERING , 2017 , 113 , 208-214 .
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Helical buckling of wires embedded in a soft matrix under axial compression EI Scopus CSSCI-E
期刊论文 | 2017 , 17 , 71-76 | Extreme Mechanics Letters
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Wires embedded in an infinite soft matrix may buckle into a three-dimensional helical mode upon compression. Based on minimization of potential energy, we present a theoretical analysis of three-dimensional helical buckling of wires embedded in matrix. The buckling spacing and amplitudes are deduced, which are further verified by parallel FEM simulations. It is suggested that, the buckled profile is almost perfectly circular in the axial direction; with increasing compression, the buckling spacing decreases almost linearly, while the amplitude scales with the 1/2 power of the compressive strain. Besides the transition strain from 2D mode to 3D helical mode decreases with the Young's modulus of the wire, and approaches to ∼1.25% when the modulus is high enough. This study may shed some lights on the buckling behaviors of wires embedded in matrix and provide some useful instructions of manufacturing complex structures. © 2017 Elsevier Ltd

Keyword :

Axial direction Buckling behaviors Compressive strain Helical buckling Helical modes Manufacturing complex Postbuckling behavior Theoretical analysis

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GB/T 7714 Chen, Youlong , Liao, Xiangbiao , Liu, Yilun et al. Helical buckling of wires embedded in a soft matrix under axial compression [J]. | Extreme Mechanics Letters , 2017 , 17 : 71-76 .
MLA Chen, Youlong et al. "Helical buckling of wires embedded in a soft matrix under axial compression" . | Extreme Mechanics Letters 17 (2017) : 71-76 .
APA Chen, Youlong , Liao, Xiangbiao , Liu, Yilun , Chen, Xi . Helical buckling of wires embedded in a soft matrix under axial compression . | Extreme Mechanics Letters , 2017 , 17 , 71-76 .
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alpha-MnO2 Nanowires/Graphene Composites with High Electrocatalytic Activity for Mg-Air Fuel Cell EI SCIE Scopus
期刊论文 | 2016 , 219 , 492-501 | ELECTROCHIMICA ACTA | IF: 4.798
WoS CC Cited Count: 11
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This paper reports the preparation of alpha-MnO2 NWs/graphene composites as the cathode catalyst for magnesium-air fuel cell and its excellent electrochemistry performance. The composites are synthesized by self-assembly of alpha-MnO2 nan alpha-MnO2 NWs/graphene was synthesized and studied in Mg-air fuel cell. alpha-MnO2 NWs/graphene was synthesized and studied in Mg-air fuel cell. owires (NWs) on the surface of graphene via a simple hydrothermal method. The alpha-MnO2 NWs/graphene composites showed a higher electrochemical activity than the commercial MnO2. The oxygen reduction peak of the alpha-MnO2 NWs/ graphene composites catalyst is tested in a 0.1 M KOH solution at -0.252 V, which is more positive than the commercial MnO2 (-0.287 V). The ORR limit current density for 28% alpha-MnO2 NWs/graphene composite is approximately 2.74 mA/cm(2), which is similar to that of the 20% Pt/C(2.79 mA/cm(2)) in the same conditions. Based on the Koutecky-Levich plot, the ORR mechanism of the composite involves a one-step, quasi-4-electron pathway. In addition, magnesium-air fuel cell with alpha-MnO2 NWs/graphene as catalyst possesses higher current density (140 mA/cm(2)) and power density (96 mW/cm(2)) compared to the commercial MnO2. This study proves that the cost-effective alpha-MnO2 NWs/ graphene with higher power generation ability make it possible for the substitute of the noble metals catalyst in the Mg-air fuel cell. (C) 2016 Published by Elsevier Ltd.

Keyword :

alpha-MnO2 Graphene Mg-air fuel cell ORR Nanowires

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GB/T 7714 Jiang, Min , He, Hao , Huang, Chen et al. alpha-MnO2 Nanowires/Graphene Composites with High Electrocatalytic Activity for Mg-Air Fuel Cell [J]. | ELECTROCHIMICA ACTA , 2016 , 219 : 492-501 .
MLA Jiang, Min et al. "alpha-MnO2 Nanowires/Graphene Composites with High Electrocatalytic Activity for Mg-Air Fuel Cell" . | ELECTROCHIMICA ACTA 219 (2016) : 492-501 .
APA Jiang, Min , He, Hao , Huang, Chen , Liu, Bo , Yi, Wen-Jun , Chao, Zi-Sheng . alpha-MnO2 Nanowires/Graphene Composites with High Electrocatalytic Activity for Mg-Air Fuel Cell . | ELECTROCHIMICA ACTA , 2016 , 219 , 492-501 .
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