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学者姓名:申胜平

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Temperature dependence of flexoelectric coefficient for bulk polymer polyvinylidene fluoride SCIE
期刊论文 | 2019 , 52 (7) | JOURNAL OF PHYSICS D-APPLIED PHYSICS
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Abstract :

The flexoelectric effect refers to linear coupling between the electric polarization in response to an elastic strain gradient. Despite the extensive study of the flexoelectric effect in ceramics and polymers, knowledge of the temperature dependence of the flexoelectric effect is still lacking. In this work, we experimentally investigate the temperature dependence of the flexoelectric coefficient of bulk polyvinylidene fluoride (PVDF) and analyze the variation of the dielectric constant and flexoelectric coefficient with increasing the temperature. The flexoelectric coefficient for bulk PVDF is found to be increased by similar to 69% when the temperature varied from 20 degrees C to 70 degrees C. Additionally, a giant flexocoupling coefficient for bulk PVDF is obtained based on the experimental values of the flexoelectric coefficient and dielectric constant. This demonstrates the promising application of polymer polyvinyl fluoride in the field of sensing, energy harvesting, and among others.

Keyword :

flexoelectric effect temperature dependence polyvinylidene fluoride

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GB/T 7714 Lu, Jianfeng , Liang, Xu , Yu, Wenshan et al. Temperature dependence of flexoelectric coefficient for bulk polymer polyvinylidene fluoride [J]. | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (7) .
MLA Lu, Jianfeng et al. "Temperature dependence of flexoelectric coefficient for bulk polymer polyvinylidene fluoride" . | JOURNAL OF PHYSICS D-APPLIED PHYSICS 52 . 7 (2019) .
APA Lu, Jianfeng , Liang, Xu , Yu, Wenshan , Hu, Shuling , Shen, Shengping . Temperature dependence of flexoelectric coefficient for bulk polymer polyvinylidene fluoride . | JOURNAL OF PHYSICS D-APPLIED PHYSICS , 2019 , 52 (7) .
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A Three-Dimensional Mixed Finite Element for Flexoelectricity EI SCIE Scopus
期刊论文 | 2018 , 85 (3) | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
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Abstract :

Flexoelectric effect is a universal and size-dependent electromechanical coupling between the strain gradient and electric field. The mathematical framework for flexoelectricity, which involves higher-order gradients of field quantities, is difficult to handle using traditional finite element method (FEM). Thus, it is important to develop an effective numerical method for flexoelectricity. In this paper, we develop a three-dimensional (3D) mixed finite element considering both flexoelectricity and strain gradient elasticity. To validate the developed element, we simulate the electromechanical behavior of a flexoelectric spherical shell subjected to inner pressure and compare the numerical results to analytical results. Their excellent agreement shows the reliability of the proposed FEM. The developed finite element is also used to simulate the electromechanical behavior of a nanometer-sized flexoelectric truncated pyramid. By decreasing the sample size, we observed the increase of its effective piezoelectricity. However, due to the effects of strain gradient elasticity and the influence of flexoelectricity on stiffness, the dependency of effective piezoelectricity on the sample size is not trivial. Numerical results indicate that, when the sample size is smaller than a certain value, the increase of effective piezoelectricity slows down. This finding also shows the importance of a numerical tool for the study of flexoelectric problems.

Keyword :

nanostructure flexoelectricity mixed finite elements strain gradient effect

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GB/T 7714 Deng, Feng , Deng, Qian , Shen, Shengping . A Three-Dimensional Mixed Finite Element for Flexoelectricity [J]. | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2018 , 85 (3) .
MLA Deng, Feng et al. "A Three-Dimensional Mixed Finite Element for Flexoelectricity" . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 85 . 3 (2018) .
APA Deng, Feng , Deng, Qian , Shen, Shengping . A Three-Dimensional Mixed Finite Element for Flexoelectricity . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2018 , 85 (3) .
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High-temperature short-range compressive responses and contact effect of ultrahigh porosity 3D random fibrous materials EI SCIE Scopus
期刊论文 | 2018 , 101 (10) , 4509-4518 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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Abstract :

Through experiments and finite element modeling (FEM) of contacting fibers, we study the compressive responses of a 3-dimensional (3D) random fibrous (RF) material of ultrahigh porosity (89%) in the through-the-thickness (TTT) and in-plane (IP) directions from 299 (room temperature) to 1273K. The experimental results indicate that localized failure and overall compressive deformation dominate the deformation process of RF materials loaded in the TTT direction at low and high temperatures, respectively. On the other hand, only localized failure is observed in the IP direction upon loading. Based on its morphological characteristics, a FE model that considers contact between the fibers is developed to simulate the compressive responses of the tested 3D RF material. In this model, the contact mechanism between the fibers is simulated based on a user-defined nonlinear spring element. The simulated strength and elastic modulus agree well with the observations from the compressive experiments.

Keyword :

finite element modeling random fibrous materials high temperatures compressive experiment contact spring

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GB/T 7714 Li, Datao , Yu, Wenshan , Xia, Wei et al. High-temperature short-range compressive responses and contact effect of ultrahigh porosity 3D random fibrous materials [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (10) : 4509-4518 .
MLA Li, Datao et al. "High-temperature short-range compressive responses and contact effect of ultrahigh porosity 3D random fibrous materials" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 101 . 10 (2018) : 4509-4518 .
APA Li, Datao , Yu, Wenshan , Xia, Wei , Fang, Qinzhi , Shen, Shengping . High-temperature short-range compressive responses and contact effect of ultrahigh porosity 3D random fibrous materials . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (10) , 4509-4518 .
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Coupled chemomechanical theory with strain gradient and surface effects EI SCIE Scopus
期刊论文 | 2018 , 229 (1) , 133-147 | ACTA MECHANICA
WoS CC Cited Count: 2
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Abstract :

Coupled chemomechanical problems have been demonstrated to exist in many engineering fields. In this paper, we constructed a coupled chemomechanical model in which strain gradient effect and surface/interface effect are considered. Based on the thermodynamical laws, evolving equations in the body and at the interface are derived. The governing equations and boundary conditions are obtained from the chemical Gibbs function variational principle based on irreversible thermodynamics. The boundary conditions are thus quite clear, particularly chemical and diffusion conditions at the interface. In the end, a numerical example is given to illustrate a moving sharp interface when chemical reaction is going on. When the strain gradient effect is taken into account, the abrupt change of radial strain at the interface in classical results is replaced by a moderate transition. As for radial and tangential stresses, they have a larger absolute value in the interfacial zone with gradient effect considered.

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GB/T 7714 Liu, Wenyuan , Shen, Shengping . Coupled chemomechanical theory with strain gradient and surface effects [J]. | ACTA MECHANICA , 2018 , 229 (1) : 133-147 .
MLA Liu, Wenyuan et al. "Coupled chemomechanical theory with strain gradient and surface effects" . | ACTA MECHANICA 229 . 1 (2018) : 133-147 .
APA Liu, Wenyuan , Shen, Shengping . Coupled chemomechanical theory with strain gradient and surface effects . | ACTA MECHANICA , 2018 , 229 (1) , 133-147 .
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Probing flexoelectricity via a split Hopkinson pressure bar experiment EI SCIE Scopus
期刊论文 | 2018 , 112 (24) | APPLIED PHYSICS LETTERS
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Flexoelectricity is thought of as a universal property of all dielectric materials that couples polarization with the inhomogeneous deformation. However, at the macroscale, this coupling is usually very weak and the direct observation of flexoelectricity always suffers from a low signal-to-noise ratio (SNR). At the micron or submicron scale, both the flexoelectric effect and some surface effects may get pronounced simultaneously. To separate the flexoelectric effect from those surface effects and accurately measure the bulk flexoelectric coefficients are challenging. In this paper, we propose a high SNR method for measuring the bulk flexoelectric coefficient 11 of millimeter-sized samples through split Hopkinson pressure bar (SHPB) experiments. Our experimental results show that for a normal impact speed (17 m/s) of the striker bar, the induced voltage difference is as high as 70 mV, which can be easily measured without using signal amplifiers. In most of previous works on measuring flexoelectric coefficients, strain gradients are introduced through the design of samples' shape such as thin beams, thin films, truncated cones and pyramids. In a different way, the proposed SHPB based approach introduces time varied strains to the system and then converts time gradients of strains into their spatial gradients through elastic waves. As a promising way of measuring bulk flexoelectric coefficients, this approach produces high SNR flexoelectric signals, reduces interferences from surface effects, and avoids difficulties in fabricating nanostructures. Published by AIP Publishing.

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GB/T 7714 Hu, Taotao , Deng, Qian , Shen, Shengping . Probing flexoelectricity via a split Hopkinson pressure bar experiment [J]. | APPLIED PHYSICS LETTERS , 2018 , 112 (24) .
MLA Hu, Taotao et al. "Probing flexoelectricity via a split Hopkinson pressure bar experiment" . | APPLIED PHYSICS LETTERS 112 . 24 (2018) .
APA Hu, Taotao , Deng, Qian , Shen, Shengping . Probing flexoelectricity via a split Hopkinson pressure bar experiment . | APPLIED PHYSICS LETTERS , 2018 , 112 (24) .
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Investigations on fracture toughness and fracture surface energy of 3D random fibrous materials at elevated temperatures EI SCIE Scopus
期刊论文 | 2018 , 190 , 288-298 | ENGINEERING FRACTURE MECHANICS
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

In this study, model. fracture toughness of three-dimensional random fibrous (3D RF) materials with a porosity of 83% is investigated from room temperature to 1273 K by performing experiments with compact tension (CT) specimens in the through-the-thickness (TTT) and in-plane (IP) directions. The experiments show that the fracture toughness in the TTT and IP directions increases from 0.0842 to 0.1162 MPa.m(1/2) and 0.4292-0.6767 MPa.m(1/2), respectively, with increasing temperature until a critical temperature (1073 K and 1223 K, respectively) is reached, following which the fracture toughness decreases from 0.1162 to 0.0819 MPa.m(1/2) and from 0.6767 to 0.6170 MPa.m(1/2), respectively. The significant changes at elevated temperatures are directly attributed to the viscous flow of the crack tip. In addition, a viscous flow contribution to the fracture surface energy of the 3D RF material is identified at high temperatures. The curves of the fracture surface energy versus temperature data for the TTT and IP directions can be partitioned into sections by fitting with experimental observations. Based on the two fitted curves, we calculate the activation energy of the viscous flow in the TTT and IP directions as 220.3 kJ/mol and 892.2 kJ/mol, respectively. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Viscous flow Random fibrous materials (RF materials) Fracture toughness Fracture surface energy Elevatedtemperatures

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GB/T 7714 Li, Datao , Yu, Wenshan , Xia, Wei et al. Investigations on fracture toughness and fracture surface energy of 3D random fibrous materials at elevated temperatures [J]. | ENGINEERING FRACTURE MECHANICS , 2018 , 190 : 288-298 .
MLA Li, Datao et al. "Investigations on fracture toughness and fracture surface energy of 3D random fibrous materials at elevated temperatures" . | ENGINEERING FRACTURE MECHANICS 190 (2018) : 288-298 .
APA Li, Datao , Yu, Wenshan , Xia, Wei , Fang, Qinzhi , Shen, Shengping . Investigations on fracture toughness and fracture surface energy of 3D random fibrous materials at elevated temperatures . | ENGINEERING FRACTURE MECHANICS , 2018 , 190 , 288-298 .
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An ABAQUS implementation of electrochemomechanical theory for mixed ionic electronic conductors EI SCIE Scopus
期刊论文 | 2018 , 319 , 34-45 | SOLID STATE IONICS
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Based on the coupled constitutive and governing equations, this paper presents a finite element approach in mixed ionic electronic conductors (MIECs) to study the electrochemomechanical coupling behavior accounting for mechanical deformation, ionic diffusion and electric performance. The numerical implementation with UEL (user-defined element) subroutines in commercial software ABAQUS is made and verified in comparison with some previous results. To investigate the performance of MIECs, this paper considers the influence of mechanical boundary conditions and some parameters, i.e., coefficients of compositional expansion (CCE), the applied voltage, the diffusion coefficients and the dielectric constant. The developed finite element method allows one to assess and design the MIECs.

Keyword :

Mixed ionic electronic conductors (MIECs) Finite element method Electrochemomechanical coupling

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GB/T 7714 Chen, Jianyong , Yu, Pengfei , Wang, Hailong et al. An ABAQUS implementation of electrochemomechanical theory for mixed ionic electronic conductors [J]. | SOLID STATE IONICS , 2018 , 319 : 34-45 .
MLA Chen, Jianyong et al. "An ABAQUS implementation of electrochemomechanical theory for mixed ionic electronic conductors" . | SOLID STATE IONICS 319 (2018) : 34-45 .
APA Chen, Jianyong , Yu, Pengfei , Wang, Hailong , Liew, K. M. , Shen, Shengping . An ABAQUS implementation of electrochemomechanical theory for mixed ionic electronic conductors . | SOLID STATE IONICS , 2018 , 319 , 34-45 .
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Path-independent integrals in electrochemomechanical systems with flexoelectricity EI SCIE Scopus
期刊论文 | 2018 , 147 , 20-28 | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
SCOPUS Cited Count: 2
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Abstract :

Recently, a larger flexoelectric-like response in a bending semiconductor was found by Narvaez et al. This fact indicates that the electrochemical processes have a great influence on flexoelectricity. Thus, study on the coupling between the electrochemical process and the flexoelectric effect is crucial. In this paper, the classical Noether theorem is applied to the dissipative electrochemomechanical processes with consideration of the flexoelectric effect and the strain gradient. The necessary and sufficient conditions for obtaining the symmetry transformation are derived. Several conservation integrals, including J- and L-integrals, are obtained. Then, the relation of the J- and L-integrals with the energy release rate is verified. We also show that J-integral here can reduce to the result in previous work. Finally, a Mode III crack problem taking the flexoelectric effect into account is discussed to show the path-independence of the J-integral. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Dissipative mechanical-electrochemical coupling processes Flexoelectricity Noether theorem Conservation integrals

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GB/T 7714 Yu, Pengfei , Chen, Jianyong , Wang, Hailong et al. Path-independent integrals in electrochemomechanical systems with flexoelectricity [J]. | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2018 , 147 : 20-28 .
MLA Yu, Pengfei et al. "Path-independent integrals in electrochemomechanical systems with flexoelectricity" . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES 147 (2018) : 20-28 .
APA Yu, Pengfei , Chen, Jianyong , Wang, Hailong , Liang, Xu , Shen, Shengping . Path-independent integrals in electrochemomechanical systems with flexoelectricity . | INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES , 2018 , 147 , 20-28 .
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Temperature-dependent fracture strength and the effect of oxidation for ZrB2-SiC ceramics EI SCIE Scopus
期刊论文 | 2018 , 38 (4) , 1112-1117 | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
WoS CC Cited Count: 3 SCOPUS Cited Count: 4
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Abstract :

Using the stress distribution of the body containing a spherical inclusion, the stress intensity factor at the tip of the annular flaw emanating from the inclusion is formulized. Since the thermal expansion coefficient of matrix and inclusion is not matched, the residual stress is also taken into account. Introducing into the proposed temperature-dependent fracture surface energy or fracture toughness, the temperature-dependent fracture strength for ZrB2-SiC is obtained. The influence of oxidation on the fracture strength is also discussed and the analysis reveals that the oxidation has significant effect on the fracture strength under some circumstances. The calculated results are compared with the experimental data and they have very good consistency.

Keyword :

Oxidation ZrB2-SiC ceramics Fracture strength Temperature-dependent Fracture surface energy

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GB/T 7714 Wang, Hailong , Chen, Jianyong , Yu, Pengfei et al. Temperature-dependent fracture strength and the effect of oxidation for ZrB2-SiC ceramics [J]. | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (4) : 1112-1117 .
MLA Wang, Hailong et al. "Temperature-dependent fracture strength and the effect of oxidation for ZrB2-SiC ceramics" . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY 38 . 4 (2018) : 1112-1117 .
APA Wang, Hailong , Chen, Jianyong , Yu, Pengfei , Shen, Shengping . Temperature-dependent fracture strength and the effect of oxidation for ZrB2-SiC ceramics . | JOURNAL OF THE EUROPEAN CERAMIC SOCIETY , 2018 , 38 (4) , 1112-1117 .
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Chemomechanical analysis for interfacial reactions between gamma-TiAl alloy and glass-ceramic coating in micro/nano scale EI SCIE Scopus
期刊论文 | 2018 , 101 (12) , 5675-5683 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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To simulate interfacial reactions process and deformation in gamma-TiAl and glass-ceramic coating system at high temperature, we developed a coupled chemomechanical model with chemical reactions, diffusion, and mechanical deformation incorporated. Tensile radial and circumferential stresses develop in interfacial zone and coatings as the interfacial reactions occur. Tensile radial stress could tear coatings off alloys while the tensile circumferential stress could result in crack initiation and propagation, even spalling of coatings. The bulk radial stress can be markedly reduced by taking the surface effect into account. Consequently, tensile radial stress vanishes in alloy-coating system on nano scale.

Keyword :

diffusion chemomechanics interfacial chemical reactions surface effect

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GB/T 7714 Liu, Wenyuan , Yu, Wenshan , Shen, Shengping . Chemomechanical analysis for interfacial reactions between gamma-TiAl alloy and glass-ceramic coating in micro/nano scale [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (12) : 5675-5683 .
MLA Liu, Wenyuan et al. "Chemomechanical analysis for interfacial reactions between gamma-TiAl alloy and glass-ceramic coating in micro/nano scale" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 101 . 12 (2018) : 5675-5683 .
APA Liu, Wenyuan , Yu, Wenshan , Shen, Shengping . Chemomechanical analysis for interfacial reactions between gamma-TiAl alloy and glass-ceramic coating in micro/nano scale . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (12) , 5675-5683 .
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