Voids and cracks detection in bulk superconductors through magnetic field and displacement signals

IF 3.8 2区 工程技术 Q1 ENGINEERING, MECHANICAL
Dongming An  (, ), Pengpeng Shi  (, ), Xiaofan Gou  (, )
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引用次数: 0

Abstract

Large-grain REBa2Cu3O7−δ (REBCO, RE = rare earth) bulk superconductors offer promising magnetic field trapping capabilities due to their high critical current density, making them ideal for many important applications such as trapped field magnets. However, for such large-grain superconductor bulks, there are lots of voids and cracks forming during the process of melting preparation, and some of them can be up to hundreds of microns or even millimeters in size. Consequently, these larger size voids/cracks pose a great threat to the strength of the bulks due to the inherent brittleness of superconductor REBCO materials. In order to ensure the operational safety of related superconducting devices with bulk superconductors, it is firstly important to accurately detect these voids/cracks in them. In this paper, we proposed a method for quantitatively evaluating multiple voids/cracks in bulk superconductors through the magnetic field and displacement response signals at superconductor bulk surface. The proposed method utilizes a damage index constructed from the magnetic field signals and displacement responses to identify the number and preliminary location of multiple defects. By dividing the detection area into subdomains and combining the magnetic field signals with displacement responses within each subdomain, a particle swarm algorithm was employed to evaluate the location and size parameters of the defects. In contrast to other evaluation methods using only magnetic field or displacement response signals, the combined evaluation method using both signals can identify the number of cracks effectively. Numerical studies demonstrate that the morphology of voids and cracks reconstructed using the proposed algorithm ideally matches real defects and is applicable to cases where voids and cracks coexist. This study provides a theoretical basis for the quantitative detection of voids/cracks in bulk superconductors.

通过磁场和位移信号检测块状超导体中的空洞和裂缝
大晶粒 REBa2Cu3O7-δ(REBCO,RE = 稀土)块状超导体因其临界电流密度高而具有良好的磁场捕获能力,是许多重要应用(如捕获磁场磁铁)的理想选择。然而,对于这种大晶粒超导体块体,在熔化制备过程中会形成大量空隙和裂缝,其中一些空隙和裂缝的尺寸可达数百微米甚至毫米。因此,由于超导体 REBCO 材料固有的脆性,这些较大尺寸的空隙/裂缝会对大块材料的强度造成极大威胁。为了确保使用块状超导体的相关超导设备的运行安全,首先必须准确检测其中的空洞/裂缝。在本文中,我们提出了一种通过超导体体表面的磁场和位移响应信号来定量评估体超导体中多重空洞/裂纹的方法。该方法利用由磁场信号和位移响应构建的损伤指数来识别多重缺陷的数量和初步位置。通过将检测区域划分为若干子域,并结合每个子域内的磁场信号和位移响应,采用粒子群算法来评估缺陷的位置和尺寸参数。与其他仅使用磁场或位移响应信号的评估方法相比,使用这两种信号的组合评估方法能有效识别裂纹的数量。数值研究表明,使用所提出的算法重建的空洞和裂缝形态与实际缺陷非常吻合,并且适用于空洞和裂缝共存的情况。这项研究为定量检测块状超导体中的空洞/裂纹提供了理论依据。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Acta Mechanica Sinica
Acta Mechanica Sinica 物理-工程:机械
CiteScore
5.60
自引率
20.00%
发文量
1807
审稿时长
4 months
期刊介绍: Acta Mechanica Sinica, sponsored by the Chinese Society of Theoretical and Applied Mechanics, promotes scientific exchanges and collaboration among Chinese scientists in China and abroad. It features high quality, original papers in all aspects of mechanics and mechanical sciences. Not only does the journal explore the classical subdivisions of theoretical and applied mechanics such as solid and fluid mechanics, it also explores recently emerging areas such as biomechanics and nanomechanics. In addition, the journal investigates analytical, computational, and experimental progresses in all areas of mechanics. Lastly, it encourages research in interdisciplinary subjects, serving as a bridge between mechanics and other branches of engineering and the sciences. In addition to research papers, Acta Mechanica Sinica publishes reviews, notes, experimental techniques, scientific events, and other special topics of interest. Related subjects » Classical Continuum Physics - Computational Intelligence and Complexity - Mechanics
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