Title :
Fracture toughness of SmBaCuO bulk superconductors at cryogenic temperatures
Author :
Yoshino, Yasuhiro ; Iwabuchi, Akira ; Takahashi, Naoki ; Katagiri, Kazumune ; Noto, Koshichi ; Sakai, Naomichi ; Murakami, Masato
Author_Institution :
Iwate Univ., Ueda, Japan
fDate :
6/1/2004 12:00:00 AM
Abstract :
Fracture toughness of Sm123 bulk superconductors with 16.7 and 28.6 mol% of Sm211 particles have been investigated by Vickers hardness test at cryogenic temperatures. The hardness test was carried out on [001] plane for two types of SmBCO bulk materials during 40-293 K. However, the hardness of Sm29 increased to 7,380 MPa with decreasing temperatures. In addition, fracture toughness of Sm17 and Sm29 are discussed calculating from Vickers hardness, median cracks length, Young´s modulus and applied load. The fracture toughness of Sm17 became constant to 0.8 MPa√m following the hardness property. The fracture toughness of Sm29 decreased from 0.73 Mpa√m at 293 K to 0.67 Mpa√m at 40 K.
Keywords :
Vickers hardness; barium compounds; cryogenics; deformation; fracture toughness; fracture toughness testing; high-temperature superconductors; samarium compounds; 40 to 293 K; Sm123 bulk superconductors; Sm17; Sm211 particles; Sm29; SmBa2Cu3Ox; SmBaCuO; Vickers hardness test; Young´s modulus; bulk materials; cryogenic temperatures; deformation mechanism; fracture toughness; median cracks length; Composite materials; Cryogenics; Fabrication; Magnetic fields; Magnetic materials; Materials science and technology; Materials testing; Superconducting materials; Superconductivity; Temperature; Cryogenic temperatures; Vickers hardness; deformation mechanism; fracture toughness;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
DOI :
10.1109/TASC.2004.830438
