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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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Revisiting the structures and energies of silicon < 110 & rang; symmetric tilt grain boundaries SCIE
期刊论文 | 2019 , 34 (6) , 1021-1033 | JOURNAL OF MATERIALS RESEARCH
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Abstract :

Atomistic simulations of 18 silicon < 110> symmetric tilt grain boundaries are performed using Stillinger Weber, Tersoff, and the optimized Modified Embedded Atom Method potentials. We define a novel structural unit classification through dislocation core analysis to characterize the relaxed GB structures. GBs with the misorientation angle h ranging from 13.44 degrees to 70.53 degrees are solely composed of Lomer dislocation cores. For GBs with h less than but close to 70.53 degrees, GB ` step' appears and the equilibrated states with lowest GB energies can be attained only when such GB ` step' is located in the middle of each single periodic GB structure. For the misorientation angles in the range of 93.37 degrees <= h <= 148.41 degrees, GB structures become complicated since they contain multiple types of dislocation cores. This work not only facilitates the structural characterization of silicon < 110> STGBs, but also may provide new insights into mirco-structure design in multicrystalline silicon.

Keyword :

silicon dislocation structural units grain boundary

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GB/T 7714 Wang, Liang , Yu, Wenshan , Shen, Shengping . Revisiting the structures and energies of silicon < 110 & rang; symmetric tilt grain boundaries [J]. | JOURNAL OF MATERIALS RESEARCH , 2019 , 34 (6) : 1021-1033 .
MLA Wang, Liang et al. "Revisiting the structures and energies of silicon < 110 & rang; symmetric tilt grain boundaries" . | JOURNAL OF MATERIALS RESEARCH 34 . 6 (2019) : 1021-1033 .
APA Wang, Liang , Yu, Wenshan , Shen, Shengping . Revisiting the structures and energies of silicon < 110 & rang; symmetric tilt grain boundaries . | JOURNAL OF MATERIALS RESEARCH , 2019 , 34 (6) , 1021-1033 .
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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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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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Ferroelectric-like hysteresis loops induced by chemical reaction and flexoelectricity in electrochemical strain microscopy measurements EI SCIE Scopus
期刊论文 | 2018 , 124 (8) | JOURNAL OF APPLIED PHYSICS
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Electrochemical strain microscopy (ESM) can provide useful information on electrochemical reactivity in solids at the nanometer scale. In ESM, a time variant electric field applied to the sharp tip induces the ionic flow and electrochemical reaction. This triggers strains as a result of Vegard effect and flexoelectric effect, and the corresponding surface displacement can he detected by the tip. As such, the process involves mechanical-electrical-chemical coupling. A series of analytical descriptions was established to analyze the image formation and spectroscopic mechanism of ESM, However, most of the existing models are limited to the partial coupling or ignore the flexoelectric effect. In this paper, based on a fully coupled theory for thermal-electrical-chemical mechanical processes, a model which accounts for the hulk defect electrochemical reaction, direct and inverse flexoelectric effect, and steric effect is developed for the mixed ionic-electronic conductor with an ionically blocking electrode. Here, the bulk defect electrochemical reactions are especially taken into account, which are ubiquitous in some electrochemical systems but usually omitted in the previous works. As an application of this work, the dynamic response of ESM measurement is solved numerically under the excitation of sinusoidal voltage. Numerical results reveal that there is an unambiguous ferroelectric-like hysteresis of the displacement-voltage loops, and the response is dependent on the frequency of applied excitation. Besides, the hulk defect electrochemical reaction has a salient influence on the particle distributions and the contribution of flexoelectric effect to the local surface displacement is marked. This work may help us to explain the image formation of ESM and explore the electrochemical process in solids, Published by AIP Publishing.

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GB/T 7714 Zhang, Gongxi , Yu, Pengfei , Shen, Shengping . Ferroelectric-like hysteresis loops induced by chemical reaction and flexoelectricity in electrochemical strain microscopy measurements [J]. | JOURNAL OF APPLIED PHYSICS , 2018 , 124 (8) .
MLA Zhang, Gongxi et al. "Ferroelectric-like hysteresis loops induced by chemical reaction and flexoelectricity in electrochemical strain microscopy measurements" . | JOURNAL OF APPLIED PHYSICS 124 . 8 (2018) .
APA Zhang, Gongxi , Yu, Pengfei , Shen, Shengping . Ferroelectric-like hysteresis loops induced by chemical reaction and flexoelectricity in electrochemical strain microscopy measurements . | JOURNAL OF APPLIED PHYSICS , 2018 , 124 (8) .
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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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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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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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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
WoS CC Cited Count: 1 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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Fracture toughness of random fibrous materials with ultrahigh porosity at elevated temperatures EI SCIE Scopus
期刊论文 | 2018 , 101 (3) , 1323-1332 | JOURNAL OF THE AMERICAN CERAMIC SOCIETY
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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The fracture toughness of three-dimensional random fibrous (3D RF) material was investigated from room temperature to 1273K by virtue of experimental method, theoretical model and Finite Element Method (FEM) in the through-the-thickness (TTT) and in-plane (IP) directions. The experiments showed that the fracture toughness in the TTT and IP directions increases (from 0.0617 to 0.0924Mpam(1/2) and from 0.2958 to 0.3982Mpam(1/2) for the TTT and IP directions, respectively) as the temperature until reaching a transition temperature (1123K and 1223K for the TTT and IP directions, respectively), then the fracture toughness decreases from 0.0924 to 0.0393Mpam(1/2) and from 0.3982 to 0.3106Mpam(1/2) for the TTT and IP directions, respectively. The fracture behavior was related to the bulk microstructures, the mechanical properties of fibers and the blunting of crack tip. The crack tip blunting affected the fracture toughness at elevated temperatures which was verified using the theoretical model. A FEM model with a single edge crack where special attention was drawn to the influence of the morphological characteristic was developed to simulate the fracture behavior of 3D RF material. Numerical results from the FEM modeling along with a theoretical model with crack tip blunting mechanism incorporated agreed well with the experimental results.

Keyword :

elevated temperatures FEM model fracture toughness random fibrous materials tensile strength

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GB/T 7714 Li, Datao , Yu, Wenshan , Xia, Wei et al. Fracture toughness of random fibrous materials with ultrahigh porosity at elevated temperatures [J]. | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (3) : 1323-1332 .
MLA Li, Datao et al. "Fracture toughness of random fibrous materials with ultrahigh porosity at elevated temperatures" . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY 101 . 3 (2018) : 1323-1332 .
APA Li, Datao , Yu, Wenshan , Xia, Wei , Fang, Qinzhi , Shen, Shengping . Fracture toughness of random fibrous materials with ultrahigh porosity at elevated temperatures . | JOURNAL OF THE AMERICAN CERAMIC SOCIETY , 2018 , 101 (3) , 1323-1332 .
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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: 3 SCOPUS Cited Count: 2
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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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