Fracture toughness of Sm123 bulk superconductors evaluated by tensile and bending tests
Fracture toughness of Sm123 bulk superconductors evaluated by tensile and bending tests
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DOI：
10.1109/tasc.2004.830390
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发表时间：
2004-08
影响因子：
1.8
通讯作者：
K. Katagiri;A. Murakami;T. Okudera;Y. Yoshino;A. Iwabuchi;K. Noto;N. Sakai;M. Murakami
中科院分区：
文献类型：
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作者：
K. Katagiri;A. Murakami;T. Okudera;Y. Yoshino;A. Iwabuchi;K. Noto;N. Sakai;M. Murakami
通过V型缺口试样的拉伸和弯曲试验，研究了试验温度和Sm211（Sm/sub 2/BaCuO/sub 5/）第二相颗粒对Sm123（SmBa/sub 2/Cu/sub 3/O/sub x/）单晶块体超导体断裂韧性的影响。通过拉伸和弯曲试验获得的断裂韧性之间的相关性不一定很好。通过压痕法获得的断裂韧性比它们低。 c轴裂纹扩展的拉伸断裂韧性为1.2-1.3 MPa m/sup 1/2/，高于垂直于c轴方向的裂纹扩展拉伸断裂韧性1.0-1.1 MPa m/sup 1/2/。虽然前者随着Sm211摩尔分数的增加而增加，但后者却没有增加。 LNT拉伸试验得到的断裂韧度与RT断裂韧性没有明显差异，而LNT压痕法得到的断裂韧性略低于RT。
The effects of test temperature and Sm211 (Sm/sub 2/BaCuO/sub 5/) secondary phase particles on the fracture toughness of the Sm123 (SmBa/sub 2/Cu/sub 3/O/sub 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/sup 1/2/, was higher than that in the direction perpendicular to the c-axis, 1.0-1.1 MPa m/sup 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.