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Yong H.,Lanzhou University | Jing Z.,Lanzhou University | Zhou Y.,Key Laboratory of Mechanics on Western Disaster and Environment
Physica C: Superconductivity and its Applications | Year: 2012

The coupling effect between the mechanical behavior and the superconductivity is significant in deformable superconductors. In this article, electromechanical characterizations for the deformable superconductors in magnetic field are presented. We assume that the critical current density is independent of the magnetic field and strain effect on the critical current density is symmetric. The coupled partial differential equations are derived for the bulk superconductor. We quantitatively illustrate the effects of coupling parameters on the magnetostriction and magnetization. © 2012 Published by Elsevier B.V. Source


Tong D.,Key Laboratory of Mechanics on Western Disaster and Environment | Huang N.,Lanzhou University
Gongcheng Lixue/Engineering Mechanics | Year: 2011

Sand velocity in aeolian sand transport is measured using the PIV system (Particle Imaging Velocimetry) in a wind tunnel. The velocity probability distribution of ascending and descending particles, as well the influences of sand ripple on the sand particle motion are analyzed. The results show that velocity distributions of take-off particles and particles during sand movement accord with logarithm normal distribution. The mean incident velocity of sand particles is 1.005-1.4 times higher than take-off ones with different wind speed. It is found that sand ripples play an important role on the sand particles motion, which is a key factor that can not be neglected. Source


Yong H.,Key Laboratory of Mechanics on Western Disaster and Environment | Liu F.,Key Laboratory of Mechanics on Western Disaster and Environment | Zhou Y.,Lanzhou University
Applied Physics Letters | Year: 2010

The objective of this paper is to obtain the analytical solutions which satisfy the differential Ginzburg-Landau equations and some boundary conditions. Based on the linear deformation theory, the effects of prestrain on the wave function and magnetic potential of deformable superconductors have been investigated in the presence of a weak magnetic field. The results show that for the superconductors with a linearly elastic deformation, the wave function in the materials should be considered for two different cases, i.e., type I and type II. The prestrain effect in deformable superconductors should not be neglected in determining the superconductivity in superconductors. © 2010 American Institute of Physics. Source


Yong H.,Key Laboratory of Mechanics on Western Disaster and Environment | Xue F.,Key Laboratory of Mechanics on Western Disaster and Environment | Zhou Y.,Key Laboratory of Mechanics on Western Disaster and Environment | Zhou Y.,Lanzhou University
Journal of Applied Physics | Year: 2010

In this paper, an analytical method is presented for determining the effective coherence length and order parameter in a superconductor. The interaction of the deformations of the crystal lattice with the superconducting condensate is considered. A simplified free energy has been used in the literature to estimate the effect of the prestrain on the coherence length and the order parameter. The exact solutions for three dimensional and plane strain problems are obtained. Based on the linear elastic theory, an extensive analysis is made during the positive and negative prestrain for the isotropic material. The results show that the effect of the prestrain on the superconductivity is appreciable. A comparison is made between three dimensional and two dimensional results, and there is not significant difference between the results for two conditions. These explicit solutions provide a convenient tool for evaluating the superconductivity when the material undergoes the deformation. © 2010 American Institute of Physics. Source


Gao Z.-W.,Key Laboratory of Mechanics on Western Disaster and Environment | Gao Z.-W.,Lanzhou University | Lee K.Y.,Yonsei University | Zhou Y.-H.,Key Laboratory of Mechanics on Western Disaster and Environment | Zhou Y.-H.,Lanzhou University
Journal of Mechanical Science and Technology | Year: 2012

In this letter, the shielding or anti-shielding effect is firstly applied to obtain the behavior of two parallel cracks in a two-dimensional type-II superconducting under electromagnetic force. Fracture analysis is performed by the finite element method and the magnetic behavior of superconductor is described by the critical state Bean model. The stress intensity factors at the crack tips can be obtained and discussed for decreasing field after zero-field cooling. The shielding or anti-shielding effect at the crack tips depend on the distance between two parallel cracks and the crack length. The results indicate that the shielding effects of the two parallel cracks increase when the distance between the two parallel cracks decreases. It can be also obtained that the superconductors with shorter cracks has more remarkable shielding effect than those with longer cracks. © 2012 The Korean Society of Mechanical Engineers and Springer-Verlag Berlin Heidelberg. Source

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