Electromechanical degradation of REBCO coated conductor tapes under combined tension and torsion loading

Gao, Peifeng; Mao, Jiali; Chen, Jiaxiang; Wang, Xingzhe; Zhou, Youhe

doi:10.1016/j.ijmecsci.2022.107314

Cited by 27 publications

(20 citation statements)

References 49 publications

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“…Critical current I c (estimated by application of the electrical field criterion E c = 1 µV/cm to the voltage V—current I curve) and n -value (estimated as the index n of the approximated I ∝ I n curve in the electrical field range of E = 0.1~10 µV/cm) are reduced under high electromagnetic and mechanic stresses, as have been reported for the superconducting oxide (such as RE(Y, Sm, Dy, Gd,···)Ba 2 Cu 3 O 7-δ : REBCCO) layer-coated tape [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 ], and Bi2223 [ 15 , 16 , 17 , 18 , 19 , 20 ]-, MgB 2 [ 21 , 22 , 23 , 24 , 25 ]- and Nb 3 Sn [ 26 , 27 , 28 , 29 , 30 , 31 ]-filamentary types. In this work, we conduct a fundamental study on the influences of cracks in superconducting layer-coated tape on I c .…”

Section: Introductionmentioning

confidence: 65%

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Ochiai,

Okuda

2023

Materials

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In order to describe the dependence of critical current on specimen length and crack size distribution in the superconducting tape with cracks of different sizes, a Monte Carlo simulation and a model analysis were carried out, employing the model specimens of various lengths constituted of multiple short sections with a crack per each. The model analysis was carried out to evaluate the effects of the two factors on the critical current of a specimen. Factor 1 is the size of the largest crack in a specimen, and Factor 2 is the difference in crack size among all sections at the critical voltage of critical current. Factors 1 and 2 were monitored by the smallest ligament parameter among all sections constituting the specimen and by the number of sections equivalent to the section containing the largest crack at the critical voltage of the critical current of the specimen, respectively. The research using the monitoring method revealed quantitatively that the critical current-reducing effect with increasing specimen length is caused by the increase in the size of the largest crack (Factor 1), and also, the critical current-raising effect is caused by the increase in the difference of crack size (Factor 2). As the effect of Factor 1 is larger than that of Factor 2, the critical current decreases with increasing specimen length. With the present approach, the critical current reducing and raising effects under various crack size distributions were evaluated quantitatively as a function of specimen length, and the specimen length-dependence of critical current obtained by the Monte Carlo simulation was described well.

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Section: Introductionmentioning

confidence: 65%

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Ochiai,

Okuda

2023

Materials

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“…The mechanical behavior at both the constituent layers and tape levels was analyzed and experimentally validated. A phenomenological model of the internal strain in the REBCO films dependence of I c was developed based on the existing phenomenological model of I c [61] and was verified by experimental results. Section 3: simulation of bending loading.…”

Section: Resultsmentioning

confidence: 88%

“…In our previous investigations [48,59], a phenomenological model of I c combining the Ekin power-law formula and Weibull distribution function was established to depict the strain dependence of I c in both reversible and irreversible regions under uniform axial loads. The model was further used to depict the I c degradation behavior of REBCO CC tapes under fatigue loads [60] and non-uniform deformation, such as combined tension-torsion [61]. A brief description of this phenomenological model of strain dependence of I c is provided below.…”

Section: Strain Dependence Of I C Modelmentioning

confidence: 99%

“…Under mechanical loads, the critical current density (j c ) normalized by the critical current density at zero strain (j c0 ) can be depicted by the phenomenological model combining the Ekin power-law formula and Weibull distribution function [61]:…”

Section: Strain Dependence Of I C Modelmentioning

confidence: 99%

“…However, the current-carrying capacity of REBCO CC tapes is determined by the internal strain state of REBCO films. By replacing ε L with ε RE int in equation ( 10), a phenomenological model of the internal strain in the REBCO films dependence of I c can be easily developed based on the existing model of I c [61]:…”

Section: Axial Tension Loadingmentioning

confidence: 99%

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Analysis of mechanical behavior and electromechanical properties of REBCO-coated conductor tapes under combined bending-tension loads using numerical methods

Pan¹,

Gao²

2023

Supercond. Sci. Technol.

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Rare-earth barium copper oxide (REBCO) high-temperature superconducting (HTS) -coated conductor (CC) tapes are potential conductors for high-field magnets. In an operating high-field magnet, REBCO CC tapes are bent into coils and simultaneously subjected to hoop electromagnetic forces. Under these combined bending-tension loads, the critical current (Ic) of the REBCO CC tapes is at risk of irreversible degradation. Therefore, investigating the mechanical behavior and electromechanical properties of REBCO CC tapes under combined bending-tension loads is necessary. In this study, the mechanical behavior of REBCO CC tapes was analyzed using a finite element model (FEM). First, in the fabrication-cooling process of REBCO CC tapes, the thermal residual stress/strain accumulated in the constituent layers was analyzed. Then, considering the thermal residual stress/strain as the initial stress-strain state, the mechanical behavior of REBCO CC tapes under various mechanical loads, such as axial tension, bending, and combined bending‑tension at 77 K, was analyzed. Furthermore, a phenomenological model of the internal strain in the REBCO films dependence of Ic was developed for analyzing the electromechanical properties of REBCO CC tapes under combined bending-tension loads at 77 K. Calculated results showed that the compressive thermal residual strain in REBCO films at 77 K was -0.25%, and the internal strain in the REBCO films corresponding to the irreversible degradation of Ic was 0.45% under axial tension loads, which was verified by experimental results. Under bending and combined bending-tension loads, the distribution of the internal strain in the REBCO films along the width direction was non-uniform owing to the Poisson effect, and the onset of the irreversible degradation of Ic occurred at the outer edge of the REBCO films. The phenomenological model was experimentally verified to be effective in Ic degradation behavior prediction under combined bending-tension loads, and model predictions based on the FEM results indicated that the electromechanical properties were significantly influenced by the bending modes (tensile bending or compressive bending) of the REBCO CC tapes.

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Strain analysis of the superconductor REBCO tape of CORC cables under winding, bending and twist deformations

Peng,

Gou

2023

Acta Mech. Sin.

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Electromechanical degradation of REBCO coated conductor tapes under combined tension and torsion loading

Cited by 27 publications

References 49 publications

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Analysis of Critical Current Dependence on Specimen Length and Crack Size Distribution in Cracked Superconductor

Analysis of mechanical behavior and electromechanical properties of REBCO-coated conductor tapes under combined bending-tension loads using numerical methods

Strain analysis of the superconductor REBCO tape of CORC cables under winding, bending and twist deformations

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