Abstract
This paper presents a fully coupled model to account for the flux pinning induced giant magnetostriction in type-II superconductors under alternating magnetic field The superconductor E-J constitutive law is characterized by power law where the critical current density is assumed to depend exponentially on the flux density. The governing equations of the two-field problem (i.e., the interactions of elastic and magnetic effects) are formulated in a two-dimensional model. The magnetostriction curves and magnetization loops are calculated over a wide range of parameters. The effects of applied magnetic field frequency f and amplitude B0 and critical current density on magnetostriction and magnetization are discussed. Results show that the critical current density of high temperature superconductor (HTS) YBCO has a significant effect on the magnetization and magnetostriction. The pinning-induced magnetostriction which has been observed in experiment can be qualitatively simulated by this model.
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Project supported by the National Natural Science Foundation of China (Nos. 11272140, 10902046, 11032006 and 11121202), the Fundamental Research Funds for the Central Universities (lzujbky-2015-176), and National Key Project of Magneto-Constrained Fusion Energy Development Program (2013GB110002).
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Gao, Z., Zhou, Y. A magneto-mechanical fully coupled model for giant magnetostriction in high temperature superconductor. Acta Mech. Solida Sin. 28, 353–359 (2015). https://doi.org/10.1016/S0894-9166(15)30021-5
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DOI: https://doi.org/10.1016/S0894-9166(15)30021-5