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1. Interface elastic field of multilayer thin foils induced by dislocation loops | |||
Xia Re,Wu Wenwang | |||
Mechanics 07 December 2015 | |||
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Abstract:A semi-analytical solution based on discrete Fast Fourier Transformation (FFT) is developed for analyzing the interface traction stress (ITS) of approaching dislocation loops within perfect bonding multi-layers. Interface elastic fields of perfect bonding multilayers are influenced by the elastic modulus mismatch and crystallographic misorientation, and then the case of perfect bonding two-layer system is elaborated in details. | |||
TO cite this article:Xia Re,Wu Wenwang. Interface elastic field of multilayer thin foils induced by dislocation loops[OL].[ 7 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4667332 |
2. Gradient Piezoelectric Beam with Flexoelectric and Surface Effects | |||
YUE Yanmei,XU Kaiyu | |||
Mechanics 05 December 2015 | |||
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Abstract:In this paper, a piezoelectric beam model with flexoelectricity and surface effects is proposed. An energy variational principle is postulated to develop the governing equations and boundary conditions. Moreover, the strain gradient coefficient and flexoelectric paprameter are introduced to account for higher order coupling effects of underlying microstructure. Then the bending problem of a cantilever beam is solved to illustrate the theory. It is found that the deflection of the cantilever may depend strongly on the so-introduced gradient-related effects and surface properties. Flexoelectricity can soften the beam stiffness, while strain gradient may enhance the beam striness. And also, the electric field distributions obtained by the models with and without the coupling of strian gradient have a great difference. | |||
TO cite this article:YUE Yanmei,XU Kaiyu. Gradient Piezoelectric Beam with Flexoelectric and Surface Effects[OL].[ 5 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4666619 |
3. Nucleation of detachment from the edge of an adhered thin elastic film | |||
HE Linghui | |||
Mechanics 28 November 2015 | |||
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Abstract:Detachment of a thin elastic film adhered onto a rigid substrate via van der Waals force is studied in the two-dimensional setting. The film is assumed semi-infite ling and undergoes a peeling force transverse to its edge. By using the modified iteration method, the critical peeling force which gives rise to detachment nucleation from the edge of the film is derived in an analytical form. | |||
TO cite this article:HE Linghui. Nucleation of detachment from the edge of an adhered thin elastic film[OL].[28 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4666707 |
4. Effects of stitches on the mechanical response of stitched composite single-lap joints | |||
WANG Zhiyong | |||
Mechanics 27 November 2015 | |||
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Abstract:The functions of stitch thread in stitched composite single-lap joints are investigated by experimental measurement and finite element (FE) simulation. Through microscopic observations, it is found that stitches severely destroyed the microstructures of laminated composites, which should have impact on the mechanical behaviors of the composite around the stitches. Digital image correlation (DIC) technique is used to measure the strain fields near the stitches when the specimens are under tensile loading. The experimental results reveal the degeneration of the mechanical properties of the composite near the stitch threads. In FE analysis, the virtual crack closure technique (VCCT) is used to analyze the effect of the stitches on the strain energy release rate (SERR) for a delamination progressing along the interface between the adherends. The FE results indicate that stitches can effectively restrain the extension of the delamination between the two adherends. | |||
TO cite this article:WANG Zhiyong. Effects of stitches on the mechanical response of stitched composite single-lap joints[OL].[27 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4666158 |
5. Magnetoelectric effect and frequency multiplying behavior of layered composites in large ac magnetic fields | |||
Longfei Niu,Hong Yao,Yang Shi,Yuanwen Gao | |||
Mechanics 20 November 2015 | |||
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Abstract:ME frequency multiplying behavior has wide applications in frequency multipliers, which can tune to a harmonic of the input frequency. It is necessary not only to widen frequency range of applications, but also to achieve more harmonics of output signals. We report a new way for adjusting the output signals frequencies by altering the applied dc magnetic fields and structures under a large ac magnetic field (100Oe). Without the dc magnetic field, some comparisons were made to study the differences of ME frequency multiplying behaviors among the different samples and as a result basic frequencies of output signals can be adjusted by changing the structures. Then, a dc magnetic field is applied to obtain more basic frequencies and distortions of output signals. At the same time, the dependences of ME effect on ac and dc magnetic fields are investigated, respectively. Our results show that structures have a significant influence on ME frequency multiplying behaviors: bilayers present more basic frequency than trilayer. Meanwhile, when a dc magnetic field was applied, odd harmonics generate and the numbers of basic frequencies increase. As the dc magnetic field continue to increase, ME frequency multiplying behaviors disappear gradually. For different samples, ME effects show different variations with the applied magnetic fields. | |||
TO cite this article:Longfei Niu,Hong Yao,Yang Shi, et al. Magnetoelectric effect and frequency multiplying behavior of layered composites in large ac magnetic fields[OL].[20 November 2015] http://en.paper.edu.cn/en_releasepaper/content/4662851 |
6. The size-dependent natural frequency of a circular nanoplate including different surface effects | |||
ZHOU Shasha,ZHOU Shenjie,LI Anqing,WANG Binglei | |||
Mechanics 13 May 2014 | |||
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Abstract:In this paper, an analytical model of a circular nanoplate including different surface effects on the top and bottom layers is developed, which can be provided to discuss the size-dependent natural frequency of the nanoplate. The governing equation of the circular nanoplate is derived based on the plate theory and the continuum surface elasticity theory. Numerical results are obtained and compared with the previous literature. The results shown that the different surface properties of the top and bottom layers result in the different size-dependence of the natural frequency from the same surface properties of the nanoplate. This study might be helpful for the design of nanoplate-based resonant micro-biochemical sensors and some related researches. | |||
TO cite this article:ZHOU Shasha,ZHOU Shenjie,LI Anqing, et al. The size-dependent natural frequency of a circular nanoplate including different surface effects[OL].[13 May 2014] http://en.paper.edu.cn/en_releasepaper/content/4596536 |
7. Efficient Sparse Least Squares Support Vector Machines for Regression | |||
SI Gangquan,SHI Jianquan,Guo Zhang | |||
Mechanics 11 March 2014 | |||
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Abstract:To solve the sparseness problem of least squares support vector machine (LSSVM) in learning process, a training algorithm of LSSVM based on active learning is investigated. In the first stage of the algorithm, in order to solve the problem of a large number of similar training data samples, we select support samples by K-means clustering method. The second stage, we obtain a model using LSSVM and conduct function estimation of the all samples, calculating the error of the estimation values and the original samples, sorting support samples and selecting the best sample. Then the selected sample is added into training set to obtain new model. And the processes are repeated until the predetermined performance requirements are achieved, thus the sparse LSSVM model is obtained. The simulation on sinc function indicates that the proposed method performs more effectively than Suykens standard sparse method for removing the redundant support vector with better sparseness and robustness. The experiments on motorcycle dataset of the UCI indicate that the proposed algorithm can solve the problem of heteroscedasticity in some degree. | |||
TO cite this article:SI Gangquan,SHI Jianquan,Guo Zhang. Efficient Sparse Least Squares Support Vector Machines for Regression[OL].[11 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4588863 |
8. Fundamental elastic singular solutions for a layer perfectly bonded to a dissimilar substrate | |||
Ma Lifeng,Zhao Jing,Alexander M. Korsunsky | |||
Mechanics 03 March 2014 | |||
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Abstract:A generic fundamental solution for an elastically dissimilar layer-substrate system with a generalized singularity embedded within the layer is derived in this study. The singularity can be a point force, an edge dislocation, a point moment, a point nucleus of strain, etc. The solutions can be used as Green's functions for integral equation formulations of layer problems in layer-substrate systems. The application of the solutions is demonstrated with two simple examples. | |||
TO cite this article:Ma Lifeng,Zhao Jing,Alexander M. Korsunsky. Fundamental elastic singular solutions for a layer perfectly bonded to a dissimilar substrate[OL].[ 3 March 2014] http://en.paper.edu.cn/en_releasepaper/content/4588628 |
9. Phase-field approach to the electrostatic interaction of inhomogeneous dielectrics | |||
Y. Ni | |||
Mechanics 13 February 2014 | |||
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Abstract:A phase-field method is proposed to solve the electrostatic field of materials with arbitrary dielectric inhomogeneities under applied electric field. This method is based on Eshelby's approach, in which the inhomogeneities are characterized by a prescribed effective polarization field, and on the phase-field theory for attaining the effective polarization. Through the variational principle, the method shows that the electrostatic field of the heterogeneous dielectrics can be evaluated by establishing an equivalent system having a homogeneous dielectric phase and a prescribed polarization field determined by a time-dependent Ginzburg-Landau equation. Possible applications of this method in heterogeneous dielectrics are discussed. | |||
TO cite this article:Y. Ni. Phase-field approach to the electrostatic interaction of inhomogeneous dielectrics[OL].[13 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4584682 |
10. Phase coexistence of decomposing ferroelectric solid solutions near morphotropic boundary | |||
Y. Ni | |||
Mechanics 13 February 2014 | |||
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Abstract:Three-dimensional computational modeling and theory predicts new feature of two-phase coexistence, i.e. appearance of a tetragonal-orthorhombic mixed state, other than conventional tetragonal-rhombohedral coexistence of decomposing Pb(Zr1-xTix)O3 (PZT) ferroelectric solid solutions near the morphotropic phase boundary (MPB). It shows that the new phase-coexistence state is formed through the phase with weak polar anisotropy loosening the rotational stability of polarization, driven by significantly decreasing the energy due to the deformation and polarization incompatibility between two phases. | |||
TO cite this article:Y. Ni. Phase coexistence of decomposing ferroelectric solid solutions near morphotropic boundary[OL].[13 February 2014] http://en.paper.edu.cn/en_releasepaper/content/4584715 |
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