Interface properties and failures of REBCO coated conductor tapes: Research progress and challenges

Gao, Peifeng; Zhang, Yameng; Wang, Xingzhe; Zhou, Youhe

doi:10.1016/j.supcon.2023.100068

Cited by 7 publications

(3 citation statements)

References 127 publications

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“…For the case of anvil width of 3 mm (figure 4(b)), in addition to stress concentrations and plastic yielding near the anvil edge, locally large relative displacements at the interface between REBCO and Buffer layers can be observed, which can induce interfacial failure near the anvil edge before the other parts of the interface, resulting in smaller interfacial strength test results. For the case of anvil width of 0.2 mm (figure 4(c)), due to the small size of the anvil, the elastic-plastic deformation close to the anvil attachment contributes significantly to the resistance to external loads, which can be expressed by equation (21) [13],…”

Section: Effects Of Anvil Test Conditionsmentioning

confidence: 99%

“…For REBCO superconducting windings with high transport current densities at cryogenic temperatures and high magnetic fields, the combined effects of residual thermal stresses and electromagnetic forces can lead to winding delamination damage, which has been found experimentally [9,10] and studied numerically [11,12]. The weak interfacial properties pose a significant obstacle, impeding the progress and practical implementation in high-field scenarios [13,14]. Since excessive radial stresses in superconducting coil structures are the main source of delamination failure in superconducting tapes, transverse tensile strength testing has been widely adopted, including anvil tension [15][16][17][18], pin-pull test [19], bending-peel method [20,21], sample-fixture integration method [22].…”

Section: Introductionmentioning

confidence: 99%

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Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations

Gao,

Zhang,

Lin

et al. 2024

Supercond. Sci. Technol.

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RE-Ba-Cu-O (REBCO, where RE = Y, Gd, Sm, and other rare earth elements) coated conductor (CC) tapes exhibit considerable potential for application within the domains of high-energy physics and high-field science. Nevertheless, weak interfacial properties pose a significant obstacle, impeding the progress and practical implementation in high-field scenarios. The anvil tension method has been extensively employed for the assessment of transverse delamination strength of REBCO CC tapes. However, the outcomes derived from anvil tension exhibit severe dispersion, thereby impeding its efficacy in evaluating material performance. The underlying cause of this phenomenon remains unidentified. In this study, error analysis of anvil measurement method in determining the transverse tensile delamination strength (TTDS) of REBCO CC tapes was conducted based on finite element (FE) numerical simulations. A two-dimensional multilayer elastic-plastic delamination FE model with main layers of REBCO CC tapes, solder connecting layers and anvil materials were developed based on the bilinear cohesive zone model. The effects of anvil test conditions and the structural configuration of the conductor itself on the test results were discussed. Simulation results show that localized premature cracking of the interface due to stress concentration and plastic yielding of the CC tape around the loading boundary is the root reason for the discrepancy between the anvil test results and the true interfacial strength. Therefore, anvil test conditions (including top anvil dimensions, soldering conditions, loading eccentricity angle, and anvil material properties) as well as the structural configuration of the conductor itself (including edge initial crack length, edge encapsulation width, and stabilizer thickness) have a significant impact on anvil test-based TTDS results.

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Section: Effects Of Anvil Test Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations

Gao,

Zhang,

Lin

et al. 2024

Supercond. Sci. Technol.

Self Cite

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“…Furthermore, mechanical characteristics vary for soldering joints and single tapes when applying deformation and stress [ 28 ]. Because REBCO CC tapes are very mechanically sensitive, excessive stress/strain can degrade their superconducting performance [ 29 , 30 , 31 ]. The study in [ 28 ] showed that the critical tensile strains of a single tape and a soldering joint were equal to 0.42% and 0.36%, respectively, indicating that mechanics-induced superconducting performance degradation is more pronounced in soldering joints due to the stress concentration.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on Mechanical Behavior and Electromechanical Properties of Solder-Jointed REBCO-Coated Conductors

Liao,

Wang,

Chen

et al. 2024

Materials

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As the second-generation high-temperature superconducting conductors, rare earth–barium–copper–oxide (REBCO) coated conductor (CC) tapes have good potential as high-field and high-energy superconductors. In superconducting applications, several joints are required for conjugating comparatively short REBCO CC tapes. Soldering lap joints are the simplest and most commonly applied REBCO CC joints. In addition to joint resistance, the mechanical behavior and electromechanical properties are also crucial for superconducting applications. In this paper, the electromechanical properties and mechanical behaviors of soldering lap joints at 77 K under a self-field were studied. The mechanical behavior was addressed by using a full three-dimensional multilayer elastic–plastic finite element model (FEM) with REBCO CC tape main layers and solder connecting layers. Then, the electromechanical properties were analyzed by using Gao’s strain-Ic degradation general model on the basis of the FEM results. Both the mechanical behavior and electromechanical properties were verified by experimental results. The effects of soldering lap conditions including lap length, soldering thickness and lap style on the electromechanical properties and mechanical behaviors were discussed. The results indicate that shorter overlap lengths and a thinner solder can reduce the premature degradation of Ic due to stress concentrations nearby the joint edges; moreover, the irreversible critical strain is significantly higher in the back-to-back joint approach compared to the widely used face-to-face joint approach.

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Nonlocal dual-phase-lag Cattaneo-type thermoelastic diffusion theory and its application in 1D transient dynamic responses analysis for copper-metallic layered structure

Li,

Liu,

2024

Acta Mech

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Interface properties and failures of REBCO coated conductor tapes: Research progress and challenges

Cited by 7 publications

References 127 publications

Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations

Error analysis for determining transverse tensile delamination strength of REBCO coated conductors by anvil test: numerical simulation demonstrations

Numerical Study on Mechanical Behavior and Electromechanical Properties of Solder-Jointed REBCO-Coated Conductors

Nonlocal dual-phase-lag Cattaneo-type thermoelastic diffusion theory and its application in 1D transient dynamic responses analysis for copper-metallic layered structure

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