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Processing Parameters that Affect the Tolerable Bending Diameter of Reacted MgB2 Wires
Byeongha Yoo,Young‑Gyun Kim,Jiman Kim,Sehoon Jang,Duck Young Hwang,Jung Tae Lee,Yeon Suk Choi,Seungyong Hahn,Haigun Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
In this study, tolerable bending diameters of reacted MgB2wires fabricated to produce varying outer sheath materials, numbersof MgB2filaments, and sheath layer thickness were investigated. The result showed that the tolerable bending diametersof the MgB2wires with Cu, Cu–Ni, and Monel sheaths were the same. This implies that the sheath material strength of thesewires does not affect the tolerable bending diameter. In addition, mono-filament wires were more vulnerable to bendingstrain than multi-filament wires due to their porous microstructure. An increase in the sheath layer thickness of the MgB2wires resulted in less degradation of the wires at high bending strains because the strain acting on the MgB2filaments wasreduced by the thick sheath layer. This study generally confirmed that the sheath layer thickness of the MgB2wire is a keyfactor to increase the bending tolerance of the wire.
전병하(ByeongHa Jeon),한동섭(DongSeop Han) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.4
로드셀형 풍향풍속계는 로드셀을 이용하여 풍향 및 풍속을 측정하기 위한 것으로 4개의 날개에 연결된 로드셀의 하중합을 이용하여 풍속을, 하중비를 이용하여 풍향을 측정한다. 풍향 및 풍속에 따른 각 로드셀 측정부의 응력을 분석하기위하여 0°에서부터 90°까지 11.25° 간격으로 8가지 풍향과, 20㎧~100㎧까지 20㎧ 간격으로 5가지 풍속을 설계변수로 채택하였다. ANSYS WORKBENCH와 CFX를 사용하여 풍향풍속계의 유동구조 연성해석을 수행하였다. A loadcell type anemovane which has windswept is the new device to measure the wind direction and speed. In this device, the wind direction is decided by using the ratio of load between each windswept , and the wind speed is calωlated by using the summation of all load. In this study the fluid - structure interaction (FSI) analysis is carried out to analyze the ratio of load and the summation if all loads. Accordingly the stress is dealt with instead of the load at the measurement part. In order analysis the stress at measurement part with respect to the wind direction and speed, eight kinds of wind direction on the intercal of 11.250 from 0° to 90° and adopted as the design parameters. And the FSI analysis for thε loadcell type anemovane is carried out by using ANSYS Workbench and CFX.
Yoo, Byeongha,Song, Jung-Bin,Kim, Jong Cheol,Kim, Young-Gyun,Kim, Jiman,Sim, Kihong,Shin, Iksang,Hwang, Duck Young,Lee, Haigun Institute of Electrical and Electronics Engineers 2018 IEEE transactions on applied superconductivity Vol.28 No.3
<P>In this paper, the superconducting properties of reacted mono- and multifilament MgB<SUB>2</SUB> wires were investigated with regards to the bending diameter via a three-point bending test using a lab-made bending test probe. The wires were manufactured by Kiswire Advanced Technology Co., Ltd. According to the results of the bending test, the tolerable bending diameters for mono- and multifilament MgB<SUB>2</SUB> wires were 30 and 160 mm, respectively. In addition, the multifilament wire at a bending diameter of 150 mm showed the existence of a resistive zone caused by the “disconnection” of the MgB<SUB>2</SUB> filaments due to microcracks developed across the entire wire along the transverse direction of the filament. Monofilament wires have the potential to be utilized in most superconducting applications in terms of bending diameter, whereas the bending properties of multifilament wires require improvement to facilitate the design and fabrication of multifilament MgB<SUB>2</SUB> magnets.</P>