Tensile testing method for rare earth based bulk superconductors at liquid nitrogen temperature

K. Kasaba, K. Katagiri, A. Murakami, G. Sato, T. Sato, Masato Murakami, Naomichi Sakai, H. Teshima, M. Sawamura

研究成果: Article

3 引用 (Scopus)

抄録

Bending tests have been commonly carried out to investigate the mechanical properties of melt-processed rare earth based bulk superconductors. Tensile tests by using small specimen, however, are preferable to evaluate the detailed distribution of the mechanical properties and the intrinsic elastic modulus because no stress distributions exist in the cross-section. In this study, the tensile test method at low temperature by using specimens with the dimensions of 3 × 3 × 4 mm from Y123 and Gd123 bulks was examined. They were glued to Al alloy rods at 400 K by using epoxy resin. Tests were carried out at liquid nitrogen temperature (LNT) by using the immersion type jig. Although the bending strength in the direction perpendicular to the c-axis of the bulks at LNT is higher than that at room temperature (RT), the tensile strength at LNT was lower than that at RT. Many of specimens fractured near the interface between the specimen and the Al alloy rod at LNT. According to the finite element method analysis, it was shown that there was a peak thermal stress in the loading direction near the interface and it was significantly higher at LNT than that at RT. It was also shown that the replacement of the Al alloy rod to Ti rod of which the coefficient of thermal expansion is close to that of bulks significantly increased the tensile strength.

元の言語English
ページ(範囲)639-643
ページ数5
ジャーナルPhysica C: Superconductivity and its Applications
426-431
発行部数I
DOI
出版物ステータスPublished - 2005 10 1

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Tensile testing
Liquid nitrogen
liquid nitrogen
Rare earths
Superconducting materials
rare earth elements
rods
tensile tests
tensile strength
room temperature
Temperature
temperature
jigs
mechanical properties
flexural strength
epoxy resins
thermal stresses
submerging
stress distribution
Tensile strength

ASJC Scopus subject areas

  • Condensed Matter Physics

これを引用

Tensile testing method for rare earth based bulk superconductors at liquid nitrogen temperature. / Kasaba, K.; Katagiri, K.; Murakami, A.; Sato, G.; Sato, T.; Murakami, Masato; Sakai, Naomichi; Teshima, H.; Sawamura, M.

:: Physica C: Superconductivity and its Applications, 巻 426-431, 番号 I, 01.10.2005, p. 639-643.

研究成果: Article

Kasaba, K. ; Katagiri, K. ; Murakami, A. ; Sato, G. ; Sato, T. ; Murakami, Masato ; Sakai, Naomichi ; Teshima, H. ; Sawamura, M. / Tensile testing method for rare earth based bulk superconductors at liquid nitrogen temperature. :: Physica C: Superconductivity and its Applications. 2005 ; 巻 426-431, 番号 I. pp. 639-643.
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