Evaluation of Mechanical Properties and Fracture Mechanism of Single Crystal Bulk High Tc Superconductors

单晶块体高温超导体的力学性能和断裂机制评价

基本信息

批准号：
15560059
负责人：
KATAGIRI Kazumune
金额：
$ 2.3万
依托单位：
IWATE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560059/
关键词：
Oxide superconductor Single crystal bulk Joint Tensile test Compressive test Bending test Strength Young's modulus 高温超電導体 3点曲げ試験破壊希土類高温超電導体破壊靭性破壊機構 3点曲げ引張り試験圧縮強度疲労強度

项目摘要

By using small specimens of bulk high T_c oxide superconductor, the mechanical properties were evaluated and the mechanisms of fracture were clarified.1.The fracture toughness of Sm based bulk evaluated by 3-point bending and tensile tests were 1.0-1.3 MPam^<1/2>. Due to the pre-existing micro-cracks in a-b plane, values for specimens with notch in c-axis, were higher than those perpendicular to it. They increased as the temperature decrease from RT to 77K.2.The 3-point bending strength and Young's modulus of Y based bulk at 77K was higher than those at RT. These were slightly higher in the top region of bulk. The bending fatigue endurance limit for 5x10^4 cycles at 77K was 70 MPa, which is 80% of bending strength.3.Compressive stress-strain curves are linear for loading perpendicular to c-axis and non-linear for c-axis loading. The compressive elastic constants and strength showed anisotropy, due to the opening and closing behavior of the micro-cracks. They were higher at 77K and also higher than those in the tensile tests. Although the strength increased with increase in the length of specimen, it decreased when the length became 4 times of the thickness due to delamination along cleavage plane and buckling.4.The tensile strength of bulk joints, where the Y bulks were joined in {110} planes with Er or Ag added Y123, were 14 MPa or 27 MPa. They were lower than 46 MPa for Y bulk. Some solidified solution areas were observed in the middle of joint region in the former and within the Y bulk in the latter were found to be the origin of fracture. The exclusion of these regions which correspond to the degraded magnetic flux trapping areas should leads to the improvement of strength of joints.

通过使用少量高T_C氧化物超导体的小样本，评估了机械性能并阐明断裂机理。1。通过3点弯曲和拉伸测试评估SM基块的断裂韧性为1.0-1.3 MPAM^<1 /2>。由于A-B平面中的微裂缝，因此在C轴上具有Notch的标本的值高于垂直于其的标本。它们随着温度从RT的降低到77K。2。在77K处的3点弯曲强度和Y Young的基于Y的大容量的模量高于RT。这些在批量的顶部区域略高。 77K时5x10^4周期的弯曲疲劳耐力极限为70 MPa，是弯曲强度的80％。3.com：压力应力 - 应变曲线是线性的，用于垂直于C轴载于C轴，而对于C轴负载的非线性。由于微裂纹的开口和闭合行为，压缩弹性常数和强度显示出各向异性。它们在77K时高，也高于拉伸试验中的测试。尽管强度随标本长度的增加而增加，但是当由于沿裂解平面和屈曲而导致的长度变成厚度的4倍时，它的强度下降。4。散装关节的拉伸强度，其中y散装在{110中均包含y块。 }带有ER或AG添加Y123的平面为14 MPa或27 MPa。它们的散装量低于46 MPa。在前者的关节区中间观察到一些固化的溶液区域，后者的Y块内被发现是断裂的起源。与这些区域相对应的这些区域的排除应导致关节强度的提高。

项目成果

期刊论文数量（24）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Fracture toughness of Sm123 bulk superconductors evaluated by tensile and bending tests

DOI：
10.1109/tasc.2004.830390
发表时间：
2004-08
期刊：
IEEE Transactions on Applied Superconductivity
影响因子：
1.8
作者：
K. Katagiri;A. Murakami;T. Okudera;Y. Yoshino;A. Iwabuchi;K. Noto;N. Sakai;M. Murakami
通讯作者：
K. Katagiri;A. Murakami;T. Okudera;Y. Yoshino;A. Iwabuchi;K. Noto;N. Sakai;M. Murakami

Low temperature mechanical properties of Y123 bulk superconductor fabricated by the modified QMG process

改进QMG工艺制备Y123体超导体的低温力学性能

DOI：
发表时间：
2004
期刊：
Physica C 412-414
影响因子：
0
作者：
A.Murakami;K.Katagiri;K.Kasaba;K.Noto et al.
通讯作者：
K.Noto et al.

A.Murakami, K.Katagiri, K.Kasaba, K.Noto, H.Teshima et al.: "Low temperature mechanical properties of Y123 bulk superconductor fabricated by the modified QMG process"Physica C. (in press). (2004)

A.Murakami、K.Katagiri、K.Kasaba、K.Noto、H.Teshima 等人：“采用改进的 QMG 工艺制造的 Y123 体超导体的低温机械性能”Physica C.（出版中）。

DOI：
发表时间：
期刊：
影响因子：
0
作者：
通讯作者：

Tensile testing method for rare earth based bulk superconductors at liquid nitrogen temperature

DOI：
10.1016/j.physc.2005.02.067
发表时间：
2005-10
期刊：
Physica C-superconductivity and Its Applications
影响因子：
1.7
作者：
K. Kasaba;K. Katagiri;A. Murakami;G. Sato;Tadashi Sato;M. Murakami;N. Sakai;H. Teshima;M. Sawamura
通讯作者：
K. Kasaba;K. Katagiri;A. Murakami;G. Sato;Tadashi Sato;M. Murakami;N. Sakai;H. Teshima;M. Sawamura

Compressive mechanical properties of Sm123 bulk superconductor at liquid nitrogen temperature

DOI：
10.1016/j.physc.2005.01.041
发表时间：
2005-10
期刊：
Physica C-superconductivity and Its Applications
影响因子：
1.7
作者：
A. Murakami;K. Katagiri;R. Kan;H. Miyata;Y. Shoji;K. Noto;A. Iwamoto;T. Mito
通讯作者：
A. Murakami;K. Katagiri;R. Kan;H. Miyata;Y. Shoji;K. Noto;A. Iwamoto;T. Mito