Kōzō Osamura

Bending Strain Dependence of Critical Current in BSCCO and REBCO Tapes

Kōzō Osamura, Shutaro Machiya

Applying BSCCO and REBCO tapes to various engineering purposes, three modes of tensile and edgewise- and flatwise- bending are essential to deform the tape in pancake and spiral windings as well as twisting. Both kinds of tape consist of brittle superconducting (SC) …

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International round-robin test for electromechanical properties of HTS wires under uniaxial tension at liquid nitrogen temperature

Kōzō Osamura, Yue Zhao, Yifei Zhang, Iole Falorio et autres

Abstract As superconducting wires have become more prevalent, it has become increasingly important to establish reliable and standardized methods for evaluating their electromechanical properties (EMPs) at cryogenic temperatures. An international round-robin test (RRT) was conducted to assess the EMPs of four commercially …

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Measurement of Mechanical Behavior of 11B-Enriched MgB2 Wire Using a Pulsed Neutron Source

Shutaro Machiya, Kōzō Osamura, Yoshimitsu Hishinuma, Hiroyasu Taniguchi et autres

MgB2 represents a hexagonal superconductive material renowned for its straightforward composition, which has facilitated the development of cost-effective practical wires. Its capacity to function at temperatures as low as liquid hydrogen (LH2) has made it a prominent candidate as wire material for …

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Measurement of Mechanical Behavior of 11B Enriched MgB2 Wire Using Pulsed Neutron Source

Shutaro Machiya, Kōzō Osamura, Yoshimitsu Hishinuma, Hiroyasu Taniguchi et autres

MgB2 is a hexagonal superconducting material, and its simple composition has led to the development of low-cost practical wires. However, the problem is that the strain characteristics of filaments are inferior to those of other practical wires, but there have been no …

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Degradation Due to Flatwise and Edgewise Bending on Critical Current of BSCCO Tapes

Kōzō Osamura, S. Yamade, Takeshi Kato

In order to clarify the influence of edgewise and flatwise bending as well as tensile load to critical current of DI-BSCCO tapes, the critical current measurement was carried out under those external loads. Both flatwise and edgewise bending gave a degradation of …

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Microstructure Dependence of Mechanical Property of Commercial MgB2 Composite Wires

Kōzō Osamura, Hidetoshi Oguro, Shutaro Machiya, Hishinuma Yoshimitsu et autres

It is known that four kinds of MgB2 composite wires have been commercialized. The present study aims to compare the difference of microstructure dependence of mechanical property of those wires. The volume fraction of MgB2 filaments in the wire was designed in …

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Weak emergence in the angular dependence of the critical current density of the high temperature superconductor coated conductor REBCO

Paul Branch, Kōzō Osamura, Damian P. Hampshire

Extensive critical current density J c measurements are reported as a function of magnetic field B , temperature T , angle θ between the applied field and the surface of the tape, and strain ε , on a REBCO coated conductor. The …

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Coercivity Mechanism of Ga-Doped Nd-Fe-B Sintered Magnets

Yutaka Matsuura, Tetsuya Nakamura, Keisuke Ishigami, Kentaro Kajiwara et autres

The alignment dependence and angular dependence of coercivity (ALDC and ANDC, respectively) of aligned and isotropically aligned Ga-doped Nd14.79Ga0.57B5,24Co1.11Febal sintered magnets were analyzed, and the results were compared with those of ferrite magnets, which were reported in our previous paper. The coercivity …

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Weakly-Emergent Strain-Dependent Properties of High Field Superconductors

Paul Branch, Yee Kin Tsui, Kōzō Osamura, Damian P. Hampshire

Abstract All superconductors in high field magnets operating above 12 T are brittle and subjected to large strains because of the differential thermal contraction between component parts on cool-down and the large Lorentz forces produced in operation. The continuous scientific requirement for …

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Inverted-parabolic and weak strain dependencies on the critical current in practical <110> and <100> oriented REBCO tapes

Kōzō Osamura, Shutaro Machiya, Kentarou Kajiwara, Takuro Kawasaki et autres

In the commercial coated conductor tapes, the twinned structure of REBCO (REBa2Cu3O7-d, RE = Y and Gd) is characterized as either <100> or <110> orientation based on the tape length direction. In this study, we investigate the effects of the two different …

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Local strain / stress and their influence to mechano - electromagnetic properties of in composite superconducting wires

Kōzō Osamura, Shutaro Machiya

International round robin test for tensile testing HTS wires at cryogenic temperatures

N. Bagrets, Valiyaparambil Abdulsalam Anvar, Luisa Chiesa, Mario Delgado et autres

Abstract Within the framework for establishing standards of test methods for superconducting technical wires, various standards have been issued by the International Electrotechnical Commission (IEC) (standard documents IEC 61788-1 to -20). Following the successful round robin test (RRT) for tensile testing REBCO …

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