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Satoshi Awaji - One of the best experts on this subject based on the ideXlab platform.
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Superconducting and Mechanical Properties of Impregnated REBCO Pancake Coils Under Large Hoop Stress
IEEE Transactions on Applied Superconductivity, 2013Co-Authors: Satoshi Awaji, Hidetoshi Oguro, K. Watanabe, T. Suwa, T. Suzuki, G. Nishijima, S. Hanai, K. Marukawa, M. Daibo, T. SaitoAbstract:We performed Hoop Stress tests of REBCO multilayer pancake coils impregnated by epoxy resin. The mechanical deformation and electric field-current properties were measured under the large Hoop Stress. The maximum Hoop Stress of about 530 MPa per Hastelloy substrate, calculated from the BJR relation, was applied in the background magnetic field of 8 T. Because the Hoop Stress level is much smaller than the mechanical tolerance of the GdBCO tape, the coil performance was limited by the angular dependence of critical current in this test. Furthermore, the Hoop Stress test under the large electromagnetic Stresses was also carried out for the other (Y, Gd)BCO coil. The (Y, Gd)BCO epoxy impregnated coil was operated without any degradation even in the huge Hoop Stress over 1300 MPa. The mechanical deformation of the coil is analysed on the basis of the measured strains. We confirmed the large strain about 0.3%-0.5% because of the Hoop Stress over 1300 MPa at Iop = 460 A and B = 13.5 T but no degradation of the coils. However, it is suggested that the coil deformation is very complicated under the large electromagnetic Stress.
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Hoop Stress test of hbox gdba _ 2 hbox cu _ 3 hbox o _ rm y coated conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: G. Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Mechanical and transport characteristic exploration for coated conductors by Hoop Stress tests
Physica C-superconductivity and Its Applications, 2011Co-Authors: Nishijima, Koji Shikimachi, Naoki Hirano, Satoshi Awaji, Shigeo Nagaya, K. Watanabe, Toru Izumi, Akira Ibi, Y. ShioharaAbstract:Abstract The authors have explored mechanical and transport characteristics of coated conductors by Hoop Stress tests at 4.2 K, 11 T. Two monolayer coils, which were YBa 2 Cu 3 O 7 (YBCO) and GdBa 2 Cu 3 O 7 (GdBCO) coils, and a double-stacked single-pancake coil were tested. The mechanical and electrical behavior of monolayer coils were simple, thus they were well explained by simple forms. The Stress and strain were easily evaluated by using BJR relation and strain gauge measurements. On the other hand, the behavior of the pancake coil was not simple. The analytically evaluated azimuthal strain was qualitatively consistent with measured strain. However, the measured radial strain was not explained by analytically because of non-monolithic deformation of the coil. The transport characteristic was influenced by the non-monolithic deformation.
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Hoop Stress Test of GdBa2Cu3Oy Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Kazuo Watanabe, Satoshi Awaji, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa 2 Cu 3 O y (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (I c ) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that I c -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Hoop Stress Test of $\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{\rm y}$ Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Toru Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
K. Watanabe - One of the best experts on this subject based on the ideXlab platform.
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Superconducting and Mechanical Properties of Impregnated REBCO Pancake Coils Under Large Hoop Stress
IEEE Transactions on Applied Superconductivity, 2013Co-Authors: Satoshi Awaji, Hidetoshi Oguro, K. Watanabe, T. Suwa, T. Suzuki, G. Nishijima, S. Hanai, K. Marukawa, M. Daibo, T. SaitoAbstract:We performed Hoop Stress tests of REBCO multilayer pancake coils impregnated by epoxy resin. The mechanical deformation and electric field-current properties were measured under the large Hoop Stress. The maximum Hoop Stress of about 530 MPa per Hastelloy substrate, calculated from the BJR relation, was applied in the background magnetic field of 8 T. Because the Hoop Stress level is much smaller than the mechanical tolerance of the GdBCO tape, the coil performance was limited by the angular dependence of critical current in this test. Furthermore, the Hoop Stress test under the large electromagnetic Stresses was also carried out for the other (Y, Gd)BCO coil. The (Y, Gd)BCO epoxy impregnated coil was operated without any degradation even in the huge Hoop Stress over 1300 MPa. The mechanical deformation of the coil is analysed on the basis of the measured strains. We confirmed the large strain about 0.3%-0.5% because of the Hoop Stress over 1300 MPa at Iop = 460 A and B = 13.5 T but no degradation of the coils. However, it is suggested that the coil deformation is very complicated under the large electromagnetic Stress.
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Hoop Stress test of hbox gdba _ 2 hbox cu _ 3 hbox o _ rm y coated conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: G. Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Mechanical and transport characteristic exploration for coated conductors by Hoop Stress tests
Physica C-superconductivity and Its Applications, 2011Co-Authors: Nishijima, Koji Shikimachi, Naoki Hirano, Satoshi Awaji, Shigeo Nagaya, K. Watanabe, Toru Izumi, Akira Ibi, Y. ShioharaAbstract:Abstract The authors have explored mechanical and transport characteristics of coated conductors by Hoop Stress tests at 4.2 K, 11 T. Two monolayer coils, which were YBa 2 Cu 3 O 7 (YBCO) and GdBa 2 Cu 3 O 7 (GdBCO) coils, and a double-stacked single-pancake coil were tested. The mechanical and electrical behavior of monolayer coils were simple, thus they were well explained by simple forms. The Stress and strain were easily evaluated by using BJR relation and strain gauge measurements. On the other hand, the behavior of the pancake coil was not simple. The analytically evaluated azimuthal strain was qualitatively consistent with measured strain. However, the measured radial strain was not explained by analytically because of non-monolithic deformation of the coil. The transport characteristic was influenced by the non-monolithic deformation.
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Hoop Stress Test of $\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{\rm y}$ Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Toru Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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development of pre bent high strength rm nb _ 3 rm sn cable with stainless steel reinforcement strands
IEEE Transactions on Applied Superconductivity, 2009Co-Authors: Gen Nishijima, Hidetoshi Oguro, Haruo Tsubouchi, Satoshi Awaji, K. WatanabeAbstract:A 7-strand Nb3Sn superconducting cable, which consists of three pre-bent CuNb/Nb3Sn strands, three stainless-steel (SS) strands, and a center SS strand, was fabricated. 2.5 turns of the cable was wound on a 262-mm diameter GFRP bobbin A triplet consisting of three pre-bent CuNb/Nb3Sn strands was also tested for comparison. The reinforcement effect of stainless-steel strands in a cable was investigated to develop a high-strength large-current superconducting cable. The Hoop Stress test result indicated that the stainless-steel reinforced CuNb/Nb3Sn cable showed better performance than the CuNb/Nb3Sn triplet under the Hoop Stress, because the stainless-steel strands reduced the Hoop Stress on Nb3Sn strands. Furthermore, the solder impregnation of the cable, which made the seven strands a monolithic conductor, improved its performance.
Nishijima - One of the best experts on this subject based on the ideXlab platform.
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Hoop Stress test on new high strength alloy laminated Bi-2223 conductor
Superconductor Science and Technology, 2015Co-Authors: Yasuyuki Miyoshi, Nishijima, Hitoshi Kitaguchi, Xavier ChaudAbstract:Bi-2223, despite its high field transport performance, lacks mechanical strength and relies on lamination technology for applications where both current density and mechanical strength are important. The Hoop Stress limits of a newly available high-strength Bi-2223 has been measured by two different methods at LNCMI-Grenoble and Tsukuba Magnet Laboratory. The measurements confirm the new conductor's high tensile strength up to 400 MPa. We discuss briefly the role of bending strain with the aid of a supplementary Hoop Stress measurement with reduced winding diameter.
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Homogeneous performance and strain tolerance of long Bi-2223 HTS conductors under Hoop Stress
Superconductor Science and Technology, 2013Co-Authors: Yasuyuki Miyoshi, Nishijima, Hitoshi Kitaguchi, Xavier Chaud, François Debray, Y. TsuchiyaAbstract:Two types of high-strength industrial Bi-2223 conductor, one laminated by copper alloy and the other laminated by stainless steel, have been tested to examine the effect of Hoop Stress on the transport property. The specimens (~2 m long) were prepared by winding one layer around a GFRP mandrel and the measurements were made in a liquid helium bath with the Hoop Stress calculated from the BJR product applied by external magnetic field. A careful measurement wire configuration was necessary to cancel the noise pick-up from the environment for more accurate determination of Ic and n-value. We show for the first time that both conductors showed homogeneous voltage–current characteristics over a long length and degradations with Hoop Stress occurred uniformly, which is crucial information for the development of HTS magnet technology. The onset of degradation occurred at 200 MPa and 220 MPa, with additional bending Stress present from the winding diameter of 108 mm, for copper alloy laminated and stainless steel laminated conductors, respectively. After considering the effect of bending strain, our result agrees well with the previously measured data.
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Mechanical and transport characteristic exploration for coated conductors by Hoop Stress tests
Physica C-superconductivity and Its Applications, 2011Co-Authors: Nishijima, Koji Shikimachi, Naoki Hirano, Satoshi Awaji, Shigeo Nagaya, K. Watanabe, Toru Izumi, Akira Ibi, Y. ShioharaAbstract:Abstract The authors have explored mechanical and transport characteristics of coated conductors by Hoop Stress tests at 4.2 K, 11 T. Two monolayer coils, which were YBa 2 Cu 3 O 7 (YBCO) and GdBa 2 Cu 3 O 7 (GdBCO) coils, and a double-stacked single-pancake coil were tested. The mechanical and electrical behavior of monolayer coils were simple, thus they were well explained by simple forms. The Stress and strain were easily evaluated by using BJR relation and strain gauge measurements. On the other hand, the behavior of the pancake coil was not simple. The analytically evaluated azimuthal strain was qualitatively consistent with measured strain. However, the measured radial strain was not explained by analytically because of non-monolithic deformation of the coil. The transport characteristic was influenced by the non-monolithic deformation.
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Hoop Stress Test of GdBa2Cu3Oy Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Kazuo Watanabe, Satoshi Awaji, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa 2 Cu 3 O y (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (I c ) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that I c -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Hoop Stress Test of $\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{\rm y}$ Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Toru Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
G. Nishijima - One of the best experts on this subject based on the ideXlab platform.
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combination of high Hoop Stress tolerance and a small screening current induced field for an advanced bi 2223 conductor coil at 4 2 k in an external field
Superconductor Science and Technology, 2015Co-Authors: Yoshinori Yanagisawa, G. Nishijima, T Takao, Seiya Iguchi, Mamoru Hamada, S Matsumoto, Hideki Nakagome, Hiroto Suematsu, Y Oshima, Xinzhe JinAbstract:An advanced Bi-2223 conductor with Ni–Cr reinforcement is a likely candidate to achieve a compact super-high field nuclear magnetic resonance (NMR) magnet capable of operation beyond 1 GHz (23.5 T). However, the conductors must show both high Hoop Stress tolerance, typically >300 MPa, and a small screening current-induced magnetic field, both of which are essential for a compact magnet generating a highly accurate field. These two conditions have not yet been demonstrated in a working coil. This is the first paper to systematically investigate both characteristics for a layer-wound coil made with the advanced Bi-2223 conductor operated mainly at 4.2 K in an external field of ≤17 T. The coil tolerated a Hoop Stress of 370 MPa, even though the conductor had a bending strain corresponding to a diameter of 120 mm. On the other hand, the coil showed a notable screening current-induced field in a low external field, which may be explained by weak-link and direct contacts between highly packed Bi-2223 filaments in the silver matrix. The field sharply decreased with increasing external field between 0–1 T. Thus, the conductor should be useful for inner coils in compact super-high field NMR magnets.
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Superconducting and Mechanical Properties of Impregnated REBCO Pancake Coils Under Large Hoop Stress
IEEE Transactions on Applied Superconductivity, 2013Co-Authors: Satoshi Awaji, Hidetoshi Oguro, K. Watanabe, T. Suwa, T. Suzuki, G. Nishijima, S. Hanai, K. Marukawa, M. Daibo, T. SaitoAbstract:We performed Hoop Stress tests of REBCO multilayer pancake coils impregnated by epoxy resin. The mechanical deformation and electric field-current properties were measured under the large Hoop Stress. The maximum Hoop Stress of about 530 MPa per Hastelloy substrate, calculated from the BJR relation, was applied in the background magnetic field of 8 T. Because the Hoop Stress level is much smaller than the mechanical tolerance of the GdBCO tape, the coil performance was limited by the angular dependence of critical current in this test. Furthermore, the Hoop Stress test under the large electromagnetic Stresses was also carried out for the other (Y, Gd)BCO coil. The (Y, Gd)BCO epoxy impregnated coil was operated without any degradation even in the huge Hoop Stress over 1300 MPa. The mechanical deformation of the coil is analysed on the basis of the measured strains. We confirmed the large strain about 0.3%-0.5% because of the Hoop Stress over 1300 MPa at Iop = 460 A and B = 13.5 T but no degradation of the coils. However, it is suggested that the coil deformation is very complicated under the large electromagnetic Stress.
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Hoop Stress test of hbox gdba _ 2 hbox cu _ 3 hbox o _ rm y coated conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: G. Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
Yuh Shiohara - One of the best experts on this subject based on the ideXlab platform.
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Hoop Stress test of hbox gdba _ 2 hbox cu _ 3 hbox o _ rm y coated conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: G. Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Hoop Stress Test of GdBa2Cu3Oy Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Kazuo Watanabe, Satoshi Awaji, Kazuhiro Minegishi, Teruo Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa 2 Cu 3 O y (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (I c ) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that I c -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.
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Hoop Stress Test of $\hbox{GdBa}_{2}\hbox{Cu}_{3}\hbox{O}_{\rm y}$ Coated Conductor
IEEE Transactions on Applied Superconductivity, 2011Co-Authors: Nishijima, Satoshi Awaji, K. Watanabe, Kazuhiro Minegishi, Toru Izumi, Yuh ShioharaAbstract:Mechanical property of GdBa2Cu3Oy (GdBCO) coated conductor was investigated at 4.2 K in a magnetic field by two ways, which are the tensile test and the Hoop Stress test. The tensile Stress/strain dependence of critical current (Ic) of a 2 mm width conductor was explored at 4.2 K, 18 T. The result provided that Ic -reversible strain limit existed in between 0.43% and 0.46%, corresponding to 907 MPa and 960 MPa in Stress, and the elastic constant was 203 GPa. The Hoop Stress test has been performed at 4.2 K, 11 T. A test coil was fabricated by winding a 5 mm width conductor on a 270 mm diameter GFRP bobbin by 1.5 turns. The maximum value of applied Hoop Stress, which was deduced from a product of magnetic field, current density and coil radius, was 1322 MPa. Five strain gauges glued on the conductor surface showed almost the same values, which were in a range of 0.64% to 0.67%, indicating the uniform longitudinal deformation. Furthermore, the Hoop Stress-strain characteristics were linear, suggesting an elastic deformation. The deduced elastic constants were in a range of 196-204 GPa. It was confirmed that the GdBCO coated conductor performance was deteriorated irreversibly by 1322 MPa Hoop Stress, whereas not by 1302 MPa Hoop Stress.