Difference of Irreversible Strain Limit in Technical RHQT Nb3Al Superconductors

2018 ◽  
Vol 28 (3) ◽  
pp. 1-5
Author(s):  
Nobuya Banno ◽  
Gen Nishijima ◽  
Hitoshi Kitaguchi ◽  
Katsumi Miyashita ◽  
Yoshihiko Nunoya ◽  
...  
2018 ◽  
Vol 8 (1) ◽  
Author(s):  
Najib Cheggour ◽  
Theodore C. Stauffer ◽  
William Starch ◽  
Peter J. Lee ◽  
Jolene D. Splett ◽  
...  

Author(s):  
xiyang su ◽  
Zhiting Huang ◽  
Cong Liu Liu ◽  
Xing-Yi Zhang

Abstract The second generation high-temperature superconducting coated conductors (CCs) have excellent electrical and mechanical properties, and are extensively used in superconducting devices such as fault current limiters, magnets and motors. During the operation of these superconducting devices, superconducting CCs inevitably bear the combination of electromagnetic force and thermal mismatch stress, resulting in straining of YBCO layer along the tape length. It is well known that the strains of superconducting CCs cause degradation of critical current (Ic). Generally, the irreversible strain limit ( ) is used to characterize the phenomenon that Ic of superconducting CCs degrades with axial strain. When the axial strain of superconducting CCs is less than , Ic can be reversibly recovered by over 99% after being unloaded. Therefore, is a key parameter for the design and application of superconducting CC devices. For this reason, to carry out a practical engineering method for improving of superconducting CCs has become a challenge and aroused interests among researchers. This study is based on the idea of precompression. A 316LN stainless steel tape was pretensioned at 77K to improve its elastic strain limit. Then, two superconducting CCs were soldered onto both surfaces of pretensioned stainless steel tape respectively. As a result, of the superconducting CCs can be controlled manually with different precompressions. Taking YBa2Cu3O7-δ (YBCO) CCs produced by SuperPower Inc. as an example, the measurement results show that the of the YBCO CCs increased from 0.39% to 0.73%. Meanwhile, the thickness of the sample did not increase more than once.


2010 ◽  
Vol 23 (5) ◽  
pp. 052002 ◽  
Author(s):  
N Cheggour ◽  
L F Goodrich ◽  
T C Stauffer ◽  
J D Splett ◽  
X F Lu ◽  
...  

2011 ◽  
Vol 24 (7) ◽  
pp. 075022 ◽  
Author(s):  
L F Goodrich ◽  
N Cheggour ◽  
X F Lu ◽  
J D Splett ◽  
T C Stauffer ◽  
...  

2006 ◽  
Vol 38 (1) ◽  
pp. 50-54 ◽  
Author(s):  
V. Yu. Mishakov ◽  
G. Ya. Slutsker ◽  
A. M. Stalevich

Author(s):  
Hitoshi Asahi ◽  
Eiji Tsuru

Application of strain based design to pipelines in arctic or seismic areas has recently been recognized as important. So far, there has been much study performed on tensile strain limit and compressive strain limit. However, the relationship between bending buckling (compressive strain limit) and tensile strain limit has not been discussed. A model using actual stress strain curves suggests that the tensile strain limit increases as Y/T rises under uniaxial tensile stress because a pipe manufacturer usually raises TS instead of lowering YS to achieve low Y/T. Under bending of a pipe with a high D/t, an increase in compressive strain on intrados of a bent pipe at the maximum bending moment (ε-cp*) improves the tensile strain limit because the tensile strain limit is controlled by the onset of buckling or ε-cp* which is increased by lowering Y/T. On the other hand, under bending of a pipe with a low D/t, the tensile strain limit may not be influenced by improvement of buckling behavior because tensile strain on the extrados is already larger than the tensile limit at ε-cp*. Finally, we argue that the balance of major linepipe properties is important. Efforts other than the strict demands for pipe properties are also very important and inevitable to improve the strain capacity of a pipeline.


Author(s):  
Yongjun Chen ◽  
Jinyang Zheng ◽  
Guide Deng ◽  
Yuanyuan Ma ◽  
Guoyou Sun

Explosion containment vessels (ECVs), which can be generally classified into three categories, i.e., multiple use ECVs and one-time use ECVs, single-layered ECVs and multi-layered ECVs, metallic ECVs and composite ECVs according to the usage, structural form and the bearing unit, respectively, are widely used to completely contain the effects of explosions. There are fundamental differences between statically-loaded pressure vessels and ECVs that operate under extremely fast loading conditions. Conventional pressure design codes, such as ASME Section VIII, EN13445 etc., can not be directly used to design ECVs. So far, a lot of investigations have been conducted to establish design method for ECVs. Several predominant effects involved in the design of ECVs such as scale effect, failure mode and failure criteria are extensively reviewed. For multiple use single-layered metallic ECVs, dynamic load factor method and AWE method are discussed. For multiple use composite ECVs, a minimum strain criteria based on explosion experiments is examined. For one-time use ECVs, a strain limit method proposed by LANL and a maximum strain criteria obtained by Russia are discussed for metallic vessel and composite vessel, respectively. Some improvements and possible future work in developing design criterion for ECVs are recommended as a conclusion.


2020 ◽  
Vol 1158 ◽  
pp. 43-97
Author(s):  
Muhammad Musaddique Ali Rafique

Bulk metallic glass matrix composites have emerged as new potential material for structural engineering applications owing to their superior strength, hardness and high elastic strain limit. However, their behaviour is dubious. They manifest brittleness and inferior ductility which limit their applications. Various methods have been proposed to overcome this problem. Out of these, introduction of foreign particles (inoculants) during solidification have been proposed as most effective. In this study, an effort has been made to delimit this drawback. A systematic tale has been presented which explain the evolution of microstructure in Zr47.5Cu45.5Al5Co2 and Zr65Cu15Al10Ni10 bulk metallic glass matrix composites with varying percentage of ZrC inoculant as analysed by secondary electron and back scatter electron imaging of as cast unetched samples. A support is provided to hypothesis that inoculation remain successful in promoting phase formation and crystallinity and improve toughness.


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