Bin Wang , Wenhai Zhou , Feng Jiang , Shijie Shi , Jiafeng Cao
{"title":"Bi-2212 圆导线不同等效结构的电磁力异同分析","authors":"Bin Wang , Wenhai Zhou , Feng Jiang , Shijie Shi , Jiafeng Cao","doi":"10.1016/j.physb.2024.416744","DOIUrl":null,"url":null,"abstract":"<div><div>Bi-2212 high-temperature superconducting circular wire exhibit excellent superconducting and electromagnetic properties, making them the preferred material for the next generation of high-temperature superconducting cables, as they can be wound in multiple layers. However, the high stress generated during the transmission of large current by the cable may damage the equipment, and the current density, magnetic field and stress distribution are different in the constant external field and the alternating external field environment. Therefore, it is critical to study the difference between the electromagnetic field distribution and the stress distribution of the circular wire in different forms of external field. In this paper, we focus on Bi-2212 circular wires and establish three types of two-dimensional finite element models using homogenization methods. We emphasize the electromagnetic field, radial stress, and circumferential stress distribution characteristics under constant magnetic field and alternating magnetic field environments. We analyze the similarities and differences among these three equivalent models under the two different external field conditions. When the background magnetic field remains constant, the electromagnetic field, radial stress, and circumferential stress exhibit a center-symmetric distribution. Under an alternating magnetic field, the electromagnetic field and stress exhibit an upper-lower symmetric distribution, with the amplitude being smaller on the left side than on the right side. When the amplitude of the background magnetic field is the same, the electromagnetic field and stress have larger amplitudes under an alternating magnetic field. When the alternating field frequency is large, the current penetration depth in the superconducting region decreases, and a part of the current is driven to Ag and Ag-Mg alloys. The Filament-matrix Homogenized Model accurately reflects the distribution patterns of the electromagnetic field and stress. Under an alternating magnetic field, the Bundle-matrix Homogenized Model has a smaller error in stress amplitude compared to the original structure.</div></div>","PeriodicalId":20116,"journal":{"name":"Physica B-condensed Matter","volume":"697 ","pages":"Article 416744"},"PeriodicalIF":2.8000,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Analysis of the differences and similarities in electromagnetic forces of different equivalent structures of Bi-2212 circular wire\",\"authors\":\"Bin Wang , Wenhai Zhou , Feng Jiang , Shijie Shi , Jiafeng Cao\",\"doi\":\"10.1016/j.physb.2024.416744\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Bi-2212 high-temperature superconducting circular wire exhibit excellent superconducting and electromagnetic properties, making them the preferred material for the next generation of high-temperature superconducting cables, as they can be wound in multiple layers. However, the high stress generated during the transmission of large current by the cable may damage the equipment, and the current density, magnetic field and stress distribution are different in the constant external field and the alternating external field environment. Therefore, it is critical to study the difference between the electromagnetic field distribution and the stress distribution of the circular wire in different forms of external field. In this paper, we focus on Bi-2212 circular wires and establish three types of two-dimensional finite element models using homogenization methods. We emphasize the electromagnetic field, radial stress, and circumferential stress distribution characteristics under constant magnetic field and alternating magnetic field environments. We analyze the similarities and differences among these three equivalent models under the two different external field conditions. When the background magnetic field remains constant, the electromagnetic field, radial stress, and circumferential stress exhibit a center-symmetric distribution. Under an alternating magnetic field, the electromagnetic field and stress exhibit an upper-lower symmetric distribution, with the amplitude being smaller on the left side than on the right side. When the amplitude of the background magnetic field is the same, the electromagnetic field and stress have larger amplitudes under an alternating magnetic field. When the alternating field frequency is large, the current penetration depth in the superconducting region decreases, and a part of the current is driven to Ag and Ag-Mg alloys. The Filament-matrix Homogenized Model accurately reflects the distribution patterns of the electromagnetic field and stress. Under an alternating magnetic field, the Bundle-matrix Homogenized Model has a smaller error in stress amplitude compared to the original structure.</div></div>\",\"PeriodicalId\":20116,\"journal\":{\"name\":\"Physica B-condensed Matter\",\"volume\":\"697 \",\"pages\":\"Article 416744\"},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2024-11-14\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Physica B-condensed Matter\",\"FirstCategoryId\":\"101\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0921452624010858\",\"RegionNum\":3,\"RegionCategory\":\"物理与天体物理\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"PHYSICS, CONDENSED MATTER\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physica B-condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0921452624010858","RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
Analysis of the differences and similarities in electromagnetic forces of different equivalent structures of Bi-2212 circular wire
Bi-2212 high-temperature superconducting circular wire exhibit excellent superconducting and electromagnetic properties, making them the preferred material for the next generation of high-temperature superconducting cables, as they can be wound in multiple layers. However, the high stress generated during the transmission of large current by the cable may damage the equipment, and the current density, magnetic field and stress distribution are different in the constant external field and the alternating external field environment. Therefore, it is critical to study the difference between the electromagnetic field distribution and the stress distribution of the circular wire in different forms of external field. In this paper, we focus on Bi-2212 circular wires and establish three types of two-dimensional finite element models using homogenization methods. We emphasize the electromagnetic field, radial stress, and circumferential stress distribution characteristics under constant magnetic field and alternating magnetic field environments. We analyze the similarities and differences among these three equivalent models under the two different external field conditions. When the background magnetic field remains constant, the electromagnetic field, radial stress, and circumferential stress exhibit a center-symmetric distribution. Under an alternating magnetic field, the electromagnetic field and stress exhibit an upper-lower symmetric distribution, with the amplitude being smaller on the left side than on the right side. When the amplitude of the background magnetic field is the same, the electromagnetic field and stress have larger amplitudes under an alternating magnetic field. When the alternating field frequency is large, the current penetration depth in the superconducting region decreases, and a part of the current is driven to Ag and Ag-Mg alloys. The Filament-matrix Homogenized Model accurately reflects the distribution patterns of the electromagnetic field and stress. Under an alternating magnetic field, the Bundle-matrix Homogenized Model has a smaller error in stress amplitude compared to the original structure.
期刊介绍:
Physica B: Condensed Matter comprises all condensed matter and material physics that involve theoretical, computational and experimental work.
Papers should contain further developments and a proper discussion on the physics of experimental or theoretical results in one of the following areas:
-Magnetism
-Materials physics
-Nanostructures and nanomaterials
-Optics and optical materials
-Quantum materials
-Semiconductors
-Strongly correlated systems
-Superconductivity
-Surfaces and interfaces