Fracture toughness evaluation of YBCO bulk superconductor

Okudera, Taichi; Murakami, Akira; Katagiri, K.; Kasaba, Koichi; Shoji, Yoshitaka; Noto, Kōshichi; Sakai, Naomichi; Murakami, Masato

doi:10.1016/s0921-4534(03)00996-1

Cited by 28 publications

(18 citation statements)

References 7 publications

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“…For both Sm17 and Sm29 at both LNT and RT, the average values for the c-notch specimens were slightly higher than those for the a-notch. This anisotropy is more marked as compared with that of the Y123 bulk superconductor reported by some of the present authors [2]. One of the reasons for the anisotropy is considered to be that the crack propagation in the c-axis was hindered by the pre-existing micro-cracks in a-b plane intersecting it [2].…”

Section: A Tensile Testsupporting

confidence: 42%

“…The 3-point bending tests for 12 pieces of c-notch specimens were also conducted at RT. The details of the bending test procedure were given in [2].…”

Section: Methodsmentioning

confidence: 99%

“…Details of the cryogenic micro-Vickers hardness tester used for the indentation tests have been reported elsewhere [10]. In this figure, the result of the Y123 bulk superconductor with 28.6 mol% Y211 and 15 wt% Ag reported previously [2] are also shown for reference.…”

Section: B Comparison With the Fracture Toughness Obtained By The DImentioning

confidence: 98%

“…Recently, some of the present authors carried out the tensile and the bending tests using the V-notched specimens of the YBa Cu O (Y123) single grain bulk superconductor [2]. The validity of using a V-notch instead of a crack has been discussed [2].…”

Section: Introductionmentioning

confidence: 98%

“…The validity of using a V-notch instead of a crack has been discussed [2]. Based on the examinations of the effect of depth and radius of curvature of the V-notch, they showed that the fracture toughness obtained from the tensile tests is almost equal to that from the bending tests [2]. Manuscript The indentation method is sometimes used to investigate the fracture toughness [3]- [6].…”

Section: Introductionmentioning

confidence: 99%

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Fracture Toughness of Sm123 Bulk Superconductors Evaluated by Tensile and Bending Tests

Katagiri

Murakami

Okudera

et al. 2004

IEEE Trans. Appl. Supercond.

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The effects of test temperature and Sm211 ( 2 BaCuO 5 ) secondary phase particles on the fracture toughness of the Sm123 (SmBa 2 Cu 3 O x ) single grain bulk superconductors were investigated by tensile and bending tests using the V-notched specimens. The correlation between the obtained fracture toughness by tensile and bending test was not necessarily good. The fracture toughness obtained by the indentation method was lower than them. The tensile fracture toughness for the crack propagation in the c-axis, 1.2-1.3 MPa m 1 2 , was higher than that in the direction perpendicular to the c-axis, 1.0-1.1 MPa m 1 2 . Although the former increased with increase in the Sm211 molar fraction, the latter did not increase. There was no appreciable difference between the fracture toughness obtained by the tensile tests at LNT and that at RT, while the fracture toughness from the indentation method at LNT was slightly lower than that at RT.

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Section: A Tensile Testsupporting

confidence: 42%

“…The 3-point bending tests for 12 pieces of c-notch specimens were also conducted at RT. The details of the bending test procedure were given in [2].…”

Section: Methodsmentioning

confidence: 99%

Section: B Comparison With the Fracture Toughness Obtained By The DImentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Fracture Toughness of Sm123 Bulk Superconductors Evaluated by Tensile and Bending Tests

Katagiri

Murakami

Okudera

et al. 2004

IEEE Trans. Appl. Supercond.

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An Effective Approach for the Development of Reliable YBCO Bulk Cryomagnets with High Trapped Field Performances

Kenfaui

Sibeud

Louradour

et al. 2014

Adv Funct Materials

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Widespread use of YBa2Cu3O7‐δ (Y123) bulk superconductors as source of strong magnetic fields requires development of high‐performance materials sufficiently reliable with improved thermal transfer ability. An effective approach based primarily on the growth of bulk Y123 single domains comprising a holes‐network to diminish the oxygen diffusion paths is reported here, as well as their progressive annealing at high temperature under oxygen pressure to reduce undue stresses and processing time. Finely, it aims to stimulate the thermal exchange inside the superconductor and compensate for induced magnetic stresses during the field‐trapping process. The approach brings considerable time and energy savings, and turns out to knock down barriers having stymied hitherto the use of Y123 bulk superconductors for engineering applications. Indeed, it enables the achievement of a pore‐free and crack‐free microstructure yielding marked fracture toughness and promoting large size persistent current loops, thereby boosting the trapped field performances. The fostering of the internal thermal exchange leads the maximum trapped field Bmax to shift to higher temperatures by up to 14 K. A value Bmax of 6.34 T is attained at 17 K on ≈16 mm‐diameter reinforced pellet (disk area s = 1.99 cm2), resulting in an outstanding field density Bmax/s=3.19 Tcm−2.

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