超导带材涂层结构边缘脱粘后的电磁应力分析  

ELECTROMAGNETIC STRESS ANALYSIS OF SUPERCONDUCTING TAPE COATING SRUCTURE AFTER EDGE DEBONDING

作　　者：杨育梅 王正鹏 雷芳明 YANG Yu-mei;WANG Zheng-peng;LEI Fang-ming(School of Science,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;College of Mechanical and Energy Engineering,Zhejiang University of Science and Technology,Hangzhou,Zhejiang 310023,China)

机构地区：[1]兰州理工大学理学院,甘肃兰州730050 [2]浙江科技学院机械与能源工程学院,浙江杭州310023

出　　处：《工程力学》2024年第8期250-256,共7页Engineering Mechanics

基　　金：国家自然科学基金地区科学基金项目(11962015);国家自然科学基金青年科学基金项目(11402106)。

摘　　要：YBCO高温超导带材因其较高的临界转变温度和较强的电流承载能力等优点,在超导技术与应用领域受到了广泛的关注。其应用中出现的常见失效模式之一——“边缘脱粘”问题严重影响了结构的稳定性。基于此,针对超导带材边缘局部脱粘后的电磁力学响应问题展开研究,考虑结构受到垂直于带材表面的外部磁场激励,结合弹性力学平面应变方法,计算了超导薄膜内正应力与基底界面处切应力相关联的奇异积分方程,通过切比雪夫级数进行数值求解,给出了结构内的电磁应力分布。结果表明:在外加磁场作用下,超导薄膜内的正应力与薄膜-基底界面处的切应力在未脱粘区域呈对称分布,在边缘脱粘区域产生应力集中现象。带材边缘脱粘宽度的增加会导致薄膜内正应力增大,进而加剧脱粘边缘的进一步脱粘。基底硬度对结构内应力分布影响显著,硬基底材料对超导薄膜有较强的约束,可有效削减薄膜内正应力值。该文的分析可为高温超导带材的理论研究和实际应用供一定的理论基础。Due to the high critical transition temperature and the high current-carrying capacity,YBCO high temperature superconducting strips attract researchers’extensive attention in areas of technology development and application.But the mechanical problem such as'edge debonding'occurs in the application of YBCO strips and threatens the strips’development seriously.So the electromagnetic mechanical response of superconducting tape after local debonding at the edge is studied.By considering that the structure is placed in an external magnetic field whose direction is perpendicular to the surface of the strip,the stress control equation is obtained base on the plane strain method,and the normal stress in the superconducting thin films as well as the shear stress on the interface is calculated by solving the Chebyshev series numerically.Results show that the normal stress in the superconducting film and the shear stress on the substrate interface are symmetrically distributed in the non debonding region under the applied magnetic field,and the stress concentration occurs in the edge debonding region.The strip edge debonding width has obvious effect on the normal stress,and an increasing debonding width leads to the increase of the normal stress,which will further aggravate the debonding edge.The hardness of the substrate has also significant effect on the distributions of both normal stress in the film and the shear stress on the interface.A harder substrate material has a stronger constraint on the superconducting film,which can effectively reduce the normal stress in the film.The research results should provide a theoretical basis for the research of high temperature superconducting tape and its application.

关 键 词：高温超导带材 平面应变方法 边缘脱粘 磁通钉扎 应力分布 

分 类 号：O343.4[理学—固体力学]