Tensile Strength and Fracture Toughness of YBCO Superconductor and Resistivity during Fracture Test

Yutaka Watanabe; Tetsuo Shoji

doi:10.1299/kikaia.55.843

Tensile Strength and Fracture Toughness of YBCO Superconductor and Resistivity during Fracture Test

Research output: Contribution to journal › Article › peer-review

Abstract

Tensile strength of sintered YBCO superconductor at 77K was evaluated by Brazilian test and fracture toughness at 85K was measured by use of round compact tention specimen. Superconductivity of specimens during Brazilian tests were examined by the four-point terminal method. Density of a specimen was the principal factor of tensile strength and the fracture surface exhibited the cleavage-intergranular mixed pattern. No change in superconductivity of specimens was observed until mechanical fracture occurred. Namely, no stress dependence on superconductivity was observed for these material tested. Fracture toughness K_o of sintered YBCO was also measured by use of a round compact specimen. The K_o value of sintered YBCO with a density of 4.84g/cm³ was l.lMPa-m^1/2. The obtained K_o shows the value of one third or quarter compared with that of ordinary ceramics (Zr0₂, AI₂O₃).

Original language	English
Pages (from-to)	843-846
Number of pages	4
Journal	Transactions of the Japan Society of Mechanical Engineers Series A
Volume	55
Issue number	512
DOIs	https://doi.org/10.1299/kikaia.55.843
Publication status	Published - 1989

Keywords

Ceramic Superconductor
Fracture Toughness
Quench Phenomenon
Strength
Stress Effect
Superconductivity

ASJC Scopus subject areas

Materials Science(all)
Mechanics of Materials
Mechanical Engineering

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title = "Tensile Strength and Fracture Toughness of YBCO Superconductor and Resistivity during Fracture Test",

abstract = "Tensile strength of sintered YBCO superconductor at 77K was evaluated by Brazilian test and fracture toughness at 85K was measured by use of round compact tention specimen. Superconductivity of specimens during Brazilian tests were examined by the four-point terminal method. Density of a specimen was the principal factor of tensile strength and the fracture surface exhibited the cleavage-intergranular mixed pattern. No change in superconductivity of specimens was observed until mechanical fracture occurred. Namely, no stress dependence on superconductivity was observed for these material tested. Fracture toughness Ko of sintered YBCO was also measured by use of a round compact specimen. The Ko value of sintered YBCO with a density of 4.84g/cm3 was l.lMPa-m1/2. The obtained Ko shows the value of one third or quarter compared with that of ordinary ceramics (Zr02, AI2O3).",

keywords = "Ceramic Superconductor, Fracture Toughness, Quench Phenomenon, Strength, Stress Effect, Superconductivity",

author = "Yutaka Watanabe and Tetsuo Shoji",

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T1 - Tensile Strength and Fracture Toughness of YBCO Superconductor and Resistivity during Fracture Test

AU - Watanabe, Yutaka

AU - Shoji, Tetsuo

PY - 1989

Y1 - 1989

N2 - Tensile strength of sintered YBCO superconductor at 77K was evaluated by Brazilian test and fracture toughness at 85K was measured by use of round compact tention specimen. Superconductivity of specimens during Brazilian tests were examined by the four-point terminal method. Density of a specimen was the principal factor of tensile strength and the fracture surface exhibited the cleavage-intergranular mixed pattern. No change in superconductivity of specimens was observed until mechanical fracture occurred. Namely, no stress dependence on superconductivity was observed for these material tested. Fracture toughness Ko of sintered YBCO was also measured by use of a round compact specimen. The Ko value of sintered YBCO with a density of 4.84g/cm3 was l.lMPa-m1/2. The obtained Ko shows the value of one third or quarter compared with that of ordinary ceramics (Zr02, AI2O3).

AB - Tensile strength of sintered YBCO superconductor at 77K was evaluated by Brazilian test and fracture toughness at 85K was measured by use of round compact tention specimen. Superconductivity of specimens during Brazilian tests were examined by the four-point terminal method. Density of a specimen was the principal factor of tensile strength and the fracture surface exhibited the cleavage-intergranular mixed pattern. No change in superconductivity of specimens was observed until mechanical fracture occurred. Namely, no stress dependence on superconductivity was observed for these material tested. Fracture toughness Ko of sintered YBCO was also measured by use of a round compact specimen. The Ko value of sintered YBCO with a density of 4.84g/cm3 was l.lMPa-m1/2. The obtained Ko shows the value of one third or quarter compared with that of ordinary ceramics (Zr02, AI2O3).

KW - Ceramic Superconductor

KW - Fracture Toughness

KW - Quench Phenomenon

KW - Strength

KW - Stress Effect

KW - Superconductivity

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