Mode-II Crack Problem for a Long Rectangular Slab of Superconductor under an Electromagnetic Force
GAO Zhi-Wen, ZHOU You-He
Key Laboratory of Mechanics on Western Disaster and Environment (Ministry of Education), and Department of Mechanics, Lanzhou University, Lanzhou 730000
Mode-II Crack Problem for a Long Rectangular Slab of Superconductor under an Electromagnetic Force
GAO Zhi-Wen, ZHOU You-He
Key Laboratory of Mechanics on Western Disaster and Environment (Ministry of Education), and Department of Mechanics, Lanzhou University, Lanzhou 730000
摘要We present a theoretical analysis to the fracture parameters of the large single domain YBCO superconductor with a tangential line crack under electromagnetic force. The mode-II fracture parameters are obtained due to coupled finite element and infinite element method, and the numerical results are conducted for two activation processes. For a zero-field cooling (ZFC) magnetization process, in the process of magnetic field descent, the larger the applied field is, the larger the stress intensity factors. In the case of field cooling (FC) magnetization process, the stress intensity factors have obvious differences between the two cases of bfc >1 and bfc≤1. Additionally, J-integral characteristic is obtained, and according to these results, the mode-II crack growth trend is predicted. These results are benefit for us to understand the fracture mechanism of superconductor both in theory and application.
Abstract：We present a theoretical analysis to the fracture parameters of the large single domain YBCO superconductor with a tangential line crack under electromagnetic force. The mode-II fracture parameters are obtained due to coupled finite element and infinite element method, and the numerical results are conducted for two activation processes. For a zero-field cooling (ZFC) magnetization process, in the process of magnetic field descent, the larger the applied field is, the larger the stress intensity factors. In the case of field cooling (FC) magnetization process, the stress intensity factors have obvious differences between the two cases of bfc >1 and bfc≤1. Additionally, J-integral characteristic is obtained, and according to these results, the mode-II crack growth trend is predicted. These results are benefit for us to understand the fracture mechanism of superconductor both in theory and application.
GAO Zhi-Wen;ZHOU You-He. Mode-II Crack Problem for a Long Rectangular Slab of Superconductor under an Electromagnetic Force[J]. 中国物理快报, 2009, 26(2): 27403-027403.
GAO Zhi-Wen, ZHOU You-He. Mode-II Crack Problem for a Long Rectangular Slab of Superconductor under an Electromagnetic Force. Chin. Phys. Lett., 2009, 26(2): 27403-027403.
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