TY - JOUR
T1 - Fracture toughness of REBaCuO bulk superconductor at liquid nitrogen temperature
AU - Katagiri, K.
AU - Sato, T.
AU - Murakami, A.
AU - Kasaba, K.
AU - Shoji, Y.
AU - Noto, K.
AU - Teshima, H.
AU - Sawamura, M.
N1 - Funding Information:
We appreciate helpful assistance in the experiment by K. Sasaki of Iwate University. This work was partly supported by grant-in-aid for scientific research, Japan Society for Promotion of Science.
PY - 2005/10/1
Y1 - 2005/10/1
N2 - The fracture toughness of Y123 and Gd123(Ag) single-grain bulk samples with 25 mol% RE 211 phase (and 10 wt.% Ag for the latter) prepared by the modified quench and melt-growth technique, was evaluated by the 3-point bending test at liquid nitrogen temperature (LNT) and room temperature (RT). The sharp V-notch was introduced into the specimens such that both of the loading and the crack extension directions are in the c-axis. The data for Y123 scattered from 1.2 to 2.0 MPam1/2 at LNT and 1.4 to 1.7 MPam1/2 at RT. The average value at LNT, 1.6 MPam1/2, was slightly higher than that for RT, 1.5 MPam1/2. For Gd123(Ag) the average fracture toughness at LNT, 1.8 MPam1/2 was higher than that at RT. The temperature dependence of fracture toughness for two kinds of bulks was consistent with that of the bending strength. Further, the order of the magnitude of the fracture toughness almost corresponded with that of bending strength for both bulks.
AB - The fracture toughness of Y123 and Gd123(Ag) single-grain bulk samples with 25 mol% RE 211 phase (and 10 wt.% Ag for the latter) prepared by the modified quench and melt-growth technique, was evaluated by the 3-point bending test at liquid nitrogen temperature (LNT) and room temperature (RT). The sharp V-notch was introduced into the specimens such that both of the loading and the crack extension directions are in the c-axis. The data for Y123 scattered from 1.2 to 2.0 MPam1/2 at LNT and 1.4 to 1.7 MPam1/2 at RT. The average value at LNT, 1.6 MPam1/2, was slightly higher than that for RT, 1.5 MPam1/2. For Gd123(Ag) the average fracture toughness at LNT, 1.8 MPam1/2 was higher than that at RT. The temperature dependence of fracture toughness for two kinds of bulks was consistent with that of the bending strength. Further, the order of the magnitude of the fracture toughness almost corresponded with that of bending strength for both bulks.
KW - Bulk superconductors
KW - Fracture toghness
KW - GdBaCu O
KW - Liquid nitrogen temperature
KW - YBaCuO
UR - http://www.scopus.com/inward/record.url?scp=25644433506&partnerID=8YFLogxK
U2 - 10.1016/j.physc.2005.02.073
DO - 10.1016/j.physc.2005.02.073
M3 - 会議記事
AN - SCOPUS:25644433506
SN - 0921-4534
VL - 426-431
SP - 709
EP - 713
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - I
T2 - Proceedings of the 17th International Symposium on Superconductivity (ISS 2004) Advances in Supeconductivity
Y2 - 23 November 2004 through 25 November 2004
ER -