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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 Fully Coupled Chemomechanical Formulation With Chemical Reaction Implemented by Finite Element Method SCIE
期刊论文 | 2019 , 86 (1) | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
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Abstract :

Based on the irreversible thermodynamics, a fully coupled chemomechanical model, i.e., the reaction-diffusion-stress model, is proposed and implemented numerically into the finite element method (FEM) with user-defined element (UEL) subroutines in ABAQUS. Compositional stress and growth stress are induced by the diffusion and chemical reactions in the solid, and in turn, both the diffusion and chemical reactions are stress-dependent. By providing specialization of the chemical reaction and free energy function, the specialized constitutive equations are introduced, which are highly coupled and nonlinear. The FE formulations are derived from the standard Galerkin approach and implemented via UEL subroutines in ABAQUS. Several illustrative numerical simulation examples are shown. The results demonstrate the validity and capability of the UEL subroutines, and show the interactions among mechanical deformation, diffusion, and chemical reaction.

Keyword :

reaction-diffusion-stress coupling chemomechanical model stress-assist chemical reaction finite element method

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GB/T 7714 Chen, Jianyong , Wang, Hailong , Liew, K. M. et al. A Fully Coupled Chemomechanical Formulation With Chemical Reaction Implemented by Finite Element Method [J]. | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2019 , 86 (1) .
MLA Chen, Jianyong et al. "A Fully Coupled Chemomechanical Formulation With Chemical Reaction Implemented by Finite Element Method" . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME 86 . 1 (2019) .
APA Chen, Jianyong , Wang, Hailong , Liew, K. M. , Shen, Shengping . A Fully Coupled Chemomechanical Formulation With Chemical Reaction Implemented by Finite Element Method . | JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME , 2019 , 86 (1) .
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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 :

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

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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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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 SCOPUS 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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Wave Propagation in Flexoelectric Microstructured Solids EI SCIE Scopus
期刊论文 | 2018 , 130 (2) , 197-210 | JOURNAL OF ELASTICITY
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Wave propagation in elastic dielectrics with flexoelectricity, micro-inertia and strain gradient elasticity is investigated in this paper. Dispersion phenomenon, which does not exist in classical elastic dielectric theory, is observed in the flexoelectric microstructured solids. Analytical solutions for the phase velocity , group velocity and their ratio are calculated for the case of harmonic decomposition. The magnitudes of the phase velocity and group velocity changed with the increasing of the wave number, while they are constant in the classical elastic dielectric theory. It is shown that the flexoelectricity, micro-inertia and microstructural effects are significant to predict the real behavior of longitudinal wave propagating in flexoelectric microstructured solids. Microstructural effects are not sufficient for dealing with realistic dispersion curves in flexoelectric solids, the micro-inertia and flexoelectricity are needed to obtain a physically acceptable value of the phase and group velocities.

Keyword :

Flexoelectricity Micro-inertia Microstructure effects Wave propagation

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GB/T 7714 Hu, Taotao , Yang, Wenjun , Liang, Xu et al. Wave Propagation in Flexoelectric Microstructured Solids [J]. | JOURNAL OF ELASTICITY , 2018 , 130 (2) : 197-210 .
MLA Hu, Taotao et al. "Wave Propagation in Flexoelectric Microstructured Solids" . | JOURNAL OF ELASTICITY 130 . 2 (2018) : 197-210 .
APA Hu, Taotao , Yang, Wenjun , Liang, Xu , Shen, Shengping . Wave Propagation in Flexoelectric Microstructured Solids . | JOURNAL OF ELASTICITY , 2018 , 130 (2) , 197-210 .
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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: 4 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 :

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

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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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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
SCOPUS Cited Count: 1
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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 :

flexoelectricity mixed finite elements nanostructure 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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Shear response of grain boundary bicrystals with a stacking fault tetrahedron EI SCIE Scopus
期刊论文 | 2018 , 147 , 137-144 | COMPUTATIONAL MATERIALS SCIENCE
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

Stacking fault tetrahedrons (SFTs) are commonly seen in the polycrystalline and nanocrystalline materials due to the heavy plastic deformation, quenching and irradiation. In this study, we present the transformation of SFT near four Cu symmetric tilt grain boundaries (GBs) under shear. Atomistic structures involved in GB deformation and SFT configuration evolutions during the shear are analyzed. Our results show that the presence of SFT has small influence on critical stress corresponding to the incipient plasticity of GB bicrystal. Because GB deformation such as migration, sliding and structure evolvement occur at a smaller external shear stress not large enough to activate the destroy of SFT, and SFT near four GBs transforms only when interacting with partial dislocation or GB. Besides, the presence of an SFT does not substantially change the deformation modes of these four GBs. Of one particular case is GB deforming in the complex mechanism due to atom-shuffling, partial dislocation nucleation and local GB dissociations. Significant stress concentration arises around GB due to SFT, which may change the nucleation site of partial dislocations. (C) 2018 Elsevier B.V. All rights reserved.

Keyword :

Bicrystal Deformation modes Grain boundary Stacking fault tetrahedron

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GB/T 7714 Wu, Lianping , Yu, Wenshan , Hu, Shuling et al. Shear response of grain boundary bicrystals with a stacking fault tetrahedron [J]. | COMPUTATIONAL MATERIALS SCIENCE , 2018 , 147 : 137-144 .
MLA Wu, Lianping et al. "Shear response of grain boundary bicrystals with a stacking fault tetrahedron" . | COMPUTATIONAL MATERIALS SCIENCE 147 (2018) : 137-144 .
APA Wu, Lianping , Yu, Wenshan , Hu, Shuling , Shen, Shengping . Shear response of grain boundary bicrystals with a stacking fault tetrahedron . | COMPUTATIONAL MATERIALS SCIENCE , 2018 , 147 , 137-144 .
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On band structures of layered phononic crystals with flexoelectricity EI SCIE Scopus
期刊论文 | 2018 , 88 (5) , 629-644 | ARCHIVE OF APPLIED MECHANICS
SCOPUS Cited Count: 1
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Abstract :

Flexoelectricity becomes remarkable in nanoscale dielectrics where strong strain gradients are expected. The effect of flexoelectricity on elastic plane waves propagating in nanoscale layered phononic crystals is discussed in the current work. The fundamental governing equations and boundary conditions are derived from the virtual work principle. Detailed calculations are performed for nanoscale two-layered and three-layered phononic crystals using the transfer matrix method. Numerical results indicate that phononic crystals possess frequency pass bands and stop bands. For nanoscale layered phononic crystals, flexoelectricity increases the middle frequency regardless of the thickness ratio, whereas the flexoelectric effect on the bandwidth depends on the thickness ratio, which implies that there is an optimal thickness ratio to maximize the bandwidth. In addition, the middle frequency and bandwidth decrease with an increase in the unit cell thickness if the thickness ratio is fixed. Hence, considering the flexoelectric effect on band structures of nanoscale phononic crystals may provide guidance in manipulating elastic wave propagation and facilitate potential applications in phononic crystal devices.

Keyword :

Band structure Flexoelectricity Phononic crystal Transfer matrix

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GB/T 7714 Yang, Wenjun , Hu, Taotao , Liang, Xu et al. On band structures of layered phononic crystals with flexoelectricity [J]. | ARCHIVE OF APPLIED MECHANICS , 2018 , 88 (5) : 629-644 .
MLA Yang, Wenjun et al. "On band structures of layered phononic crystals with flexoelectricity" . | ARCHIVE OF APPLIED MECHANICS 88 . 5 (2018) : 629-644 .
APA Yang, Wenjun , Hu, Taotao , Liang, Xu , Shen, Shengping . On band structures of layered phononic crystals with flexoelectricity . | ARCHIVE OF APPLIED MECHANICS , 2018 , 88 (5) , 629-644 .
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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
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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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 :

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

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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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