Thermo-mechanical properties of bulk high Tc, superconductors

块状高温超导体的热机械性能

基本信息

批准号：
17560059
负责人：
KATAGIRI Kazumune
金额：
$ 2.24万
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：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560059/
关键词：
High Tc oxide superconductor Single crystal bulk Thermal fatigue Tensile test Finite element method analysis Ag particle addition Size effect Non-steady thermal stress 高温超電導体結晶異方性破壊靭性試験熱物性値

项目摘要

1 Cyclic thermal shocks : Tensile tests on the specimens cut from large single domain Dy123 bulk subjected to 110 cycles of thermal shock by cooling to 77K have been conducted. Although the Young's modulus, E, and the ultimate tensile strength, UTS, did not change in a, b axis, they decreased to half in c-axis. In the small specimens, no damage was found in UTS and the fracture toughness. The thermal cycle slightly lowered the UTS of specimen adhered to Ti rod. In the 10wt% Ag particle added Dy123 bulk, E slightly decreased and UTS increased. The particles prevent the thermal damage through the compressive residual stress near the particle.The finite element method analysis, ANSYS, on the non-steady state thermal stress by rapid cooling explained the difference of damage in specimens with different size mentioned above. It was shown that the increase in diameter to 100 mm and thickness of the bulk raise the thermal stress but it saturates at 25 mm thickness. While the maximum thermal stress in a, b axis was larger in plain sample, those in c-axis was larger in Ag added sample. This is due to the higher thermal conductivity and E in c-axis.2 Bulk-metal composite : The UTS at 77K of the bulk specimens adhered directly or via the bulk interlayer to the Al and Ti rods were higher in the order. Although the specimens adhered to Al were broken in the high thermal stress region, it was not the case in specimens with interlayer. The UTS corresponded with the maximum stress in the FEM simulated tensile test.3 Cryogenic thermal parameters : Using our conduction cooling refrigerating type system, the temperature dependence of thermal conductivity and coefficient of thermal expansion relevant to the thermal stress of bulk and metals down to 20K were evaluated.

1个环状热冲击：通过冷却至77K，从大型单个域DY123散装切割的标本上的拉伸测试。尽管年轻的模量，E和最终的拉伸强度UTS在A，B轴上没有变化，但C轴的降低到一半。在小标本中，UTS和断裂韧性未发现损坏。热循环稍微降低了粘附在Ti杆上的标本的UT。在10wt％Ag粒子中添加了DY123批量，E略有下降，UTS增加。颗粒通过粒子附近的压缩残留应力防止热损伤。有限元方法分析ANSYS在非稳态的状态热应力上通过快速冷却解释了上述不同尺寸的标本的损伤差异。结果表明，直径增加到100毫米，并且散装的厚度会增加热应力，但在25 mm的厚度下饱和。虽然平面样品中A中的最大热应力较大，但在AG中，C轴中的热应力较大。这是由于较高的导热率和c轴中的E。2散装金属复合材料：直接或通过散装层中AL和Ti杆的块状标本的UTS在77K处构成。尽管在高热应力区域中粘附于Al的样本被损坏，但在与层间的标本中并非如此。 UTS与FEM模拟拉伸试验中的最大应力相对应。3低温热参数：使用我们的传导冷却冷冻制冷类型系统，导热率的温度依赖性以及与散装和金属热应力相关的热膨胀系数被评估。

项目成果

期刊论文数量（9）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Advanced tensile testing method for bulk superconductors at cryogenic temperature

低温体超导体的先进拉伸测试方法

DOI：
发表时间：
2006
期刊：
Physica C (印刷中)
影响因子：
0
作者：
K.Kasaba;H.Teshima;T.Hokari;K.Katagiri;et al.
通讯作者：
et al.

Advanced tensile testing methods for bulk superconductors at cryogenic temperatures

低温下块体超导体的先进拉伸测试方法

DOI：
发表时间：
2006
期刊：
Physica C 445-448
影响因子：
0
作者：
K.Kasaba;H.Teshima;T.Hokari;T.Sato;K.Katagiri et al.
通讯作者：
K.Katagiri et al.

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

Evaluation of Young's modulus of RE123 superconductors by three point bending test

三点弯曲试验评价RE123超导体的杨氏模量