Critical-Current Degeneration Dependence on Axial Strain of Bi-based Superconducting Multi-filamentary Composite Tapes

作     者：GAO Pei-Feng WANG Xing-Zhe 

作者机构：Key Laboratory of Mechanics on Western Disaster and Environment (Ministry of Education) and College of Civil Engineering and Mechanics Lanzhou University Lanzhou 730000 

出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)

年 卷 期：2014年第31卷第4期

页      面：155-158页

核心收录：

学科分类：080801[工学-电机与电器] 0808[工学-电气工程] 08[工学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 0814[工学-土木工程] 

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11032006 and 11121202  and the National Key Project of Magneto-Constrained Fusion Energy Development Program under Grant No 2013GB110002 

主　　题：CRITICAL currents MULTIFILAMENTARY superconductors WEIBULL distribution SUPERCONDUCTING tape COMPRESSION loads 

摘      要：Superconducting materials are always severely restricted in practical engineering applications due to their carrying- current degradation under mechanical loads. Based on Ekin＇s exponential model and Weibull＇s distribution func- tion, we propose an empirical degradation model for describing the mechanical deformation influence on the critical-current of Bi-based superconducting multi-filamentary composite tapes under axial loading. The critical currents of superconducting tapes depending on the axial strain are investigated analytically. It is shown that the predictions by the developed degradation model agree with the experimental data, in the processes of axial mechanical loading and unloading on the samples. The effect of the critical tension and compression damage strains on the normalized critical currents is also discussed.